SGP/EBBR - EBBR E20 Thermocouple Data Incorrect

Left and right thermocouple air temperature data are incorrect during the
replacement of the right thermocouple.

Affected data are:

5 minute:  tair_bot, tair_top
15 minute: tai_r, tair_l
30 minute: tair_bot, tair_top, e, h, bowen

• temp_air_top
• temp_air_bottom

• temp_air_right
• temp_air_left

• temp_air_bottom
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• bowen_ratio
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR - EBBR E20 Right Air Temperature Incorrect

The right air temperature (thermocouple) output was frequently offscale.
Examination of the 15 minute data will clearly show which times are
affected during the period.

The affected data are:

5 minute:  tair_top, tair_bot
15 minute: tair_r
30 minute: tair_top, tair_bot, bowen, h, e

• temp_air_top
• temp_air_bottom

• temp_air_right

• temp_air_bottom
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• bowen_ratio
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR - EBBR E20 Left Air Temperature Incorrect

Left air temperature (thermocouple) was incorrect during part of the period,
thereby affecting top and bottom air temperature.

The affected data and times are:

5 minute:  tair_top (1935 GMT)
15 minute: tair_l (1945 GMT)
30 minute: tair_top, bowen, e, h (2000 GMT)

• temp_air_top

• temp_air_left

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• bowen_ratio
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 - EBBR E20 Wind Speed Iced

The anemometer was frozen stopped by freezing rain.  Indicated data is incorrect.

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP EBBR E20 - E20 EBBR Right Air T Incorrect

The right air temperature probe was incorrect while
connections for it were checked.  Bowen ratio, sensible 
heat flux, and latent heat flux were incorrect as a result.

• vapor_pressure_top
• temp_air_top
• temp_air_bottom
• vapor_pressure_bottom

• temp_air_right

• vapor_pressure_bottom
• temp_air_bottom
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• vapor_pressure_top
• bowen_ratio
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP EBBR E20 - E20 EBBR Right Air T Incorrect

The right air temperature probe was incorrect frequently.  Inspection of
the right air temperature data will quickly show where it went offscale.
Bowen ratio, sensible heat flux, and latent heat flux were incorrect as a result.

• vapor_pressure_top
• temp_air_top
• temp_air_bottom
• vapor_pressure_bottom

• temp_air_right

• vapor_pressure_bottom
• temp_air_bottom
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• vapor_pressure_top
• bowen_ratio
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP EBBR E20 - E20 EBBR Data Incorrect During STP #3 Replacement

All data was incorrect during replacement of soil temperature 
probe #3.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• Raw data stream - documentation not supported

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_moisture_3_r
• soil_moisture_2_r
• soil_moisture_1_r
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_moisture_5_r
• soil_moisture_4_r
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP EBBR E20 - E20 EBBR Data Incorrect After Program Restart

All data was incorrect after a datalogger program restart.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• Raw data stream - documentation not supported

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_moisture_3_r
• soil_moisture_2_r
• soil_moisture_1_r
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_moisture_5_r
• soil_moisture_4_r
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP EBBR E20 - E20 EBBR Data Incorrect

Data was incorrect right after a datalogger upgrade.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• Raw data stream - documentation not supported

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_moisture_3_r
• soil_moisture_2_r
• soil_moisture_1_r
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_moisture_5_r
• soil_moisture_4_r
• soil_heat_flow_5_mv
• soil_moisture_4_rr
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• soil_moisture_2
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP EBBR E20 - E20 EBBR Data Incorrect

The data was incorrect because battery voltage was low.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• Raw data stream - documentation not supported

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_moisture_3_r
• soil_moisture_2_r
• soil_moisture_1_r
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_moisture_5_r
• soil_moisture_4_r
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP EBBR E20 - E20 EBBR Net Radiation Data Incorrect

The net radiation data was incorrect while the top dome was being replaced.
Sensible and latent heat fluxes are therefore also incorrect.

• Radiation, net(net_radiation)

• net_radiation_mv

• Radiation, net(net_radiation)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP EBBR E20 - E20 EBBR Data Incorrect During 6 Month Checks

The data was incorrect during the 6 month checks.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_moisture_3_r
• soil_moisture_2_r
• soil_moisture_1_r
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• soil_temp_3_rr
• temp_trh_right_rr
• soil_moisture_5_r
• soil_moisture_4_r
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - T/RH Check

During the month of November 1994, site operations personnel conducted
field comparisons of the temperature and relative humidity sensors in the
EBBRs and the HMI31 portable T/RH meter (with the removable probe).  As is
reflected in the home signal output, the automatic exchange mechanism was
disabled in order to conduct the checks.

Measurements were taken every 5 minutes, for a half hour each in the
aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated
radiation shield to provide the same aspiration as the EBBR sensors
received).  Measurements of aspirator flow were also recorded.  This
information was provided to the mentor.  The mentor then compared the field
checks with the data recorded by the EBBRs.

The periods of data and data fields that are incorrect because of the checks
are listed below.  Times are those at which the data are reported.


Data Fields
5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot
15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l
30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot, bowen, e, h

5 minute:  1520, 1525, 1530, 1535, 1540, 1545, 1550, 1555, 1600,
           1605
15 minute: 1530, 1545, 1600, 1615
30 minute: 1530, 1600, 1630

(EDITOR'S NOTE:  The following analysis refers to all EBBRs installed in Nov 1994)

Results of the T/RH comparisons:
The combined accuracy of the HMI31 and EBBR temperature sensors
(thermocouples or PRTDs) is +/- 0.4 degrees C.  The combined accuracy of the
HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH
greater than 80%.  The combined accuracy for each pair of EBBR sensors of
the same type is essentially the same as the quantities stated above.

All of the pairs of EBBR sensors show differences that fall within the
stated combined accuracies.  Although this sounds wonderful, a few of the
differences are close to the combined accuracy, which, because of the small
differences in temperature being measured (normally smaller than the
magnitude of the combined accuracy) could lead to some incorrect estimation
of sensible and latent heat flux.  However, unless there would be substantial
differences of calibration slope of two sensors in a pair, the switching of
height of the sensors every 15 minutes by the automatic exchange mechanism
will remove the offset between the sensors.

The comparisons between the EBBR sensors and the HMI31 T/RH meter showed
much larger differences.  The range of differences were: -2.4 to 0.0 degrees
for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to
6.7 percent for the RH sensors.  Six Thermocouples indicated differences from
the HMI31 greater than the combined accuracy.  Seven PRTDs indicated
differences from the HMI31 greater than the combined accuracy.  Four RH
sensors indicated differences from the HMI31 greater than the combined
accuracy.  The temperature differences (for both thermocouples and PRTDs)
were nearly all of one sign; the HMI31 indicated the greater temperature,
which may suggest a bias in the HMI31 temperature measurement, even though
a dozen differences of +/- 0.2 degrees were measured.  Four differences of
zero and only one positive difference (out of 40) were measured.  Thirteen of
the 20 RH differences were positive (HMI31 indicating the lower
RH), with the differences near the level of the combined accuracies being
approximately 50% positive and 50% negative.  It does not appear that the
HMI31 has a RH bias.

Plots of EBBR sensor/HMI31 differences as a function of time from the
installation of the individual sensors (a range of 10 to 30 months in the
field) shows no obvious pattern of sensor drift with time.  This is encouraging.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - 3-month Check

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled
(reflected by home signals near zero) so that the two aspirator units can be
placed at the same height.  The measurements during this period, at least,
do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h),
or latent heat flux (e), nor do the air temperature and relative humidity
measurements indicate gradients.  Checks performed before or after the AEM
is disabled also lead to some incorrect data.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - 6 Month Checks

The indicated measurements were incorrect during the 6 month checks.

• temp_air_top
• temp_trh_top
• rh_bottom_fraction
• temp_trh_bottom
• temp_air_bottom
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• temp_air_left
• temp_air_right

• temp_air_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• rh_bottom_fraction
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - AEM Hung

The automatic exchange mechanism frequently hung in one position.  The home signals and 
automated qc in the netcdf data files indicate when this occurred.  Bowen ratio, sensible 
heat flux, and latent heat flux are incorrect for this condition.

• temp_air_top
• temp_trh_top
• rh_bottom_fraction
• temp_trh_bottom
• temp_air_bottom
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• temp_air_left
• temp_air_right

• temp_air_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• rh_bottom_fraction
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Battery Voltage Low

When the battery voltage is below 10.5 volts, most of the measurements are suspect.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• Raw data stream - documentation not supported

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_heat_flow_5_mv
• soil_moisture_4_rr
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - Pressure Almost Constant

During the indicated period the pressure went to an almost constant 102 to 105 kPa.  This 
occurred after the replacement of another sensor.  The incorrect pressure values affect 
the sensible and latent heat flux calculations.

• Barometric Pressure(atmos_pressure)

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Barometric Pressure(atmos_pressure)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 - Measurements Zero

Most measurements were zero during the indicated periods.  This often happens for the 
first reported data time after a CR10 datalogger restart.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• Raw data stream - documentation not supported

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_heat_flow_5_mv
• soil_moisture_4_rr
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - Measurements Incorrect

Many measurements were incorrect because of the lack of an initial 15 minute value to use 
for gradient or soil change of energy storage calculations.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• Raw data stream - documentation not supported

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Soil temperature mean 2(soil_temp_2)
• Barometric Pressure(atmos_pressure)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• soil_moisture_2
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - Data Incorrect during 6 month checks

Some of the measurements are incorrect during the 6 month checks.

• temp_air_top
• temp_trh_top
• rh_bottom_fraction
• temp_trh_bottom
• temp_air_bottom
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• temp_air_left
• temp_air_right

• temp_air_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• rh_bottom_fraction
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Data Zero following logger restarts

Most of the measurements were zero, which normally happens after a 
datalogger restart.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - Battery voltage low

When Battery Voltage drops below 10.5 volts, most 
measurements are suspect and some are often incorrect.

The user will need to inspect the data carefully to 
determine the useability of the data.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_heat_flow_5_mv
• soil_moisture_4_rr
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - AEM Hung between Home Positions

When the AEM (Automatic Exchange Mechanism) is hung 
inbetween home positions, the gradients of temperature and 
relative humidity, and thus sensible and latent heat fluxes, 
are incorrect.

There is no work-around to this problem.

• temp_air_top
• temp_trh_top
• rh_bottom_fraction
• temp_trh_bottom
• temp_air_bottom
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• temp_air_left
• temp_air_right

• temp_air_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• rh_bottom_fraction
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Data incorrect during instrument maintenance

Most of the data was incorrect just after the EBBR unit was replaced.

• Barometric Pressure(atmos_pressure)
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• wdir_vec_std

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• temp_trh_right_rr
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• wdir_vec_std
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - Resistance-based Measurements Incorrect

When the Reference Temperature in the EBBR 
enclosure is not reported correctly, it
affects all resistance-based measurements
that are adjusted with the temperature of 
the reference junction.

No work-around is possible for this situation.

• temp_air_top
• temp_air_bottom

• temp_air_left
• temp_air_right

• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• surface_soil_heat_flux_3
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• temp_air_bottom
• energy_storage_change_5
• energy_storage_change_4
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Soil temperature mean 2(soil_temp_2)
• temp_reference
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)

SGP/EBBR/E20 - REPROCESS: Net Rad Coefficients Incorrect

The Net Radiometer coefficients were incorrect in the CR10
program when the replacement EBBR unit was installed on
08/09/02.

The data can be easily corrected; see the Suggestion area below.

• Radiation, net(net_radiation)

• Radiation, net(net_radiation)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 -  6 Month Checks

Many measurements were incorrect while the AEM was positioned with both aspirators at the 
same height for comparison checks.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Fuse Blown in AEM

When the EBBR system restarted on 15 Oct. 2003, the AEM
malfunctioned.  Surface fluxes data during this period
are incorrect.

• temp_air_top
• temp_trh_top
• rh_bottom_fraction
• temp_trh_bottom
• temp_air_bottom
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• temp_air_left
• temp_air_right

• temp_air_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• rh_bottom_fraction
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20  - Water in Net Radiometer, Surface Fluxes Incorrect

The net radiometer top dome was punctured by migrating birds.  This alone does not cause 
incorrect net radiation measurements.  However, when it subsequently rains, water collects 
in the bottom dome, causing the net radiation measurements to be too large during the 
day and too small at night.

• Radiation, net(net_radiation)

• net_radiation_mv

• Radiation, net(net_radiation)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 - 6 Month Checks

Many measurements were incorrect while the AEM was positioned with both aspirators at the 
same height for comparison checks.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Wind Direction Incorrect

Wind direction is incorrect, reading at or about 0 or 15 to 25 degrees.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Pressure Sensor Data Incorrect

The E20 pressure sensor suffered
from spikes in pressure, which were related to 
increases in voltage during the day as the 
solar panels charged the battery.  These spikes
were not of a magnitude that would affect the 
30 minute surface fluxes.

Replacement of the pressure sensor solved the problem.

• Barometric Pressure(atmos_pressure)

• atmos_pressure_mv

• Barometric Pressure(atmos_pressure)

SGP/EBBR/E20  - Wind Speed Sensor Frozen By Ice Storm

The wind speed sensor was frozen stopped by ice from a storm.  The wind speed 
and residual wind speed measurements are incorrect.

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20  - Wind Speed Frozen Stopped By Ice

An ice storm froze the wind speed sensor to a stopped condition.

The wind speed and residual wind speed measurements are incorrect.

This sensor failure does not affect the sensible and latent heat fluxes.

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20  - Wind Direction Frozen Stopped By Ice

The wind direction sensor was frozen stopped by ice from a storm.  
The wind direction, sigma_wd, and residual wind speed measurements 
are incorrect.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Left Air Temperature Incorrect

The left air temperature, and therefore top and bottom air temperatures
were offscale or incorrect on occasion.  Bowen ratio, sensible heat flux, and latent heat 
flux were also incorrect during those times.

Inspection of the data is required to detect the incorrect periods.

• temp_air_top
• temp_air_bottom

• temp_air_left

• Corrected sensible heat flux(h)
• Heat flux, sensible, best estimate(hcomb)
• Heat flux, latent(e)
• tair_bot
• Heat flux, sensible, aerodynamic(ah)
• Heat flux, latent, aerodynamic(ale)
• Heat flux, latent, best estimate(ecomb)
• tair_top
• bowen

• temp_air_bottom
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• bowen_ratio

SGP/EBBR/E20 - Wind Direction Stuck at 100 Degrees

The wind direction sensor was stuck at about 100 degrees.  This did
not affect the primary measurements (net radiation, soil heat flow, sensible heat flux, 
latent heat flux).

• Wind speed vector mean(wspd_vec_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - AEM Failure

The AEM hung inbetween positions; home signals were zero.

The AEM fuse kept blowing, most likely because of worn
rails or sleeves.  This condition may reoccur.

• temp_air_top
• rh_bottom_fraction
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• temp_air_left
• temp_air_right

• temp_air_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• rh_bottom_fraction
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - 6 Month Checks

Many measurements were incorrect while the AEM was positioned with both aspirators at the 
same height for comparison checks.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20  - Wind Speed Frozen Stopped By Ice Storm

An ice storm froze the wind speed sensor to a stopped condition.

The wind speed and residual wind speed measurements are incorrect.

This sensor failure does not affect the sensible and latent heat fluxes.

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20  - Wind Direction Frozen Stopped By Ice Storm

The wind direction sensor was frozen stopped by ice from a storm.  
The wind direction, sigma_wd, and residual wind speed measurements 
are incorrect.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Temp. of thum_left Incorrect At Times

The temperature portion of the left T/RH probe temperature spiked at times.  This was 
caused by a faulty surge protector in the J-Panel.

• vapor_pressure_top
• temp_trh_top
• temp_trh_bottom
• vapor_pressure_bottom

• temp_trh_left_rr

• vapor_pressure_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• vapor_pressure_top
• bowen_ratio
• temp_trh_bottom
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 - metadata corrections

On 20050723, a series of metadata corrections and additions were completed.  These 
metadata changes apply to all EBBR.E20 data collected by ARM back to the installation of the 
instrument in April 1993. Please see the current metadata for correct information.  These 
changes do not
affect data values or quality.	

The changes are summarized below:
1) Update of "sensor location" information
2) Addition of installation dates for the systems
3) Correction of soil moisture units (from "by volume" to "gravimetric")

• base_time

• base_time

• base_time

SGP/EBBR/E20 - Data Incorrect During J-Panel Replacement

Much of the data was incorrect during replacement of J-Panel #1.

• Barometric Pressure(atmos_pressure)
• lon
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• time
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• base_time
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• lat
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• alt
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• time_offset
• wdir_vec_std

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• base_time
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• time_offset
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• lat
• temp_trh_right_rr
• alt
• soil_heat_flow_5_mv
• soil_moisture_4_rr
• soil_temp_4_rr
• lon
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• alt
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• base_time
• temp_trh_bottom
• wdir_vec_std
• time_offset
• lat
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• lon
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - Suspect Measurements

Some measurements may be incorrect because of low supply voltage.

• Barometric Pressure(atmos_pressure)
• lon
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• time
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• base_time
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• lat
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• alt
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• time_offset
• wdir_vec_std

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_heat_flow_3_mv
• net_radiation_mv
• soil_moisture_1_rr
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• base_time
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• soil_moisture_2_rr
• time_offset
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• lat
• temp_trh_right_rr
• alt
• soil_heat_flow_5_mv
• soil_moisture_4_rr
• soil_temp_4_rr
• lon
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• alt
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• base_time
• temp_trh_bottom
• wdir_vec_std
• time_offset
• lat
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_moisture_1
• surface_soil_heat_flux_5
• lon
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - Net Radiation, Fluxes Too Large

Net Radiation was way too large because of water in the bottom dome.
This resulted in the sensible and latent heat fluxes being too large also.

• Radiation, net(net_radiation)

• Radiation, net(net_radiation)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 - Reprocess: Wind Direction 20 Degrees Low

The EBBR wind direction was found to be misaligned 20 degrees low. 

This bias should have had no effect on the res_ws or sigma_wd measurements.

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

SGP/EBBR/E20 - Reprocess: Wind Direction 65 Degrees Low

The wind direction sensor reported wind directions that were 65 degrees too low because of 
a mis-alignment.

This bias should have no effect on the res_ws or sigma_wd measurements.

The wind direction data could be re-processed by adding 65 degrees.

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

SGP/EBBR/E20 - Wind Direction 50 Degrees High

The wind direction was offset high about 50 degrees.

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

SGP/EBBR/E20 - Wind Direction Incorrect

The wind direction differed from the co-located SMOS by 50 deg during part of the stated 
period and the electronics had failed completely resulting in a constant 135 degrees for 
the following dates and times:
08/15 0230-0430, 0830-1530 and 09/03 0200-0300, 0500 - 09/10 2230.

Sensible and latent heat fluxes were not affected by this problem.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Wind Speed Incorrect

The wind speed sensor was frozen stopped by freezing rain.

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Wind Direction Incorrect

The wind direction measurement was stuck at 40 degrees.

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std

• wdir_vec_mean_mv

• wdir_vec_std
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

SGP/EBBR/E20 - Wind speed sensor frozen stopped

The wind speed sensor was frozen stopped by freezing rain.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_std
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Incorrect Sensible and Latent Heat Fluxes

Because of a periodic AEM failure, home signal 30 was often stuck at the home signal 15 
position.  These occurrences resulted in incorrect latent and sensible heat flux values at 
times.  Some missing data occurred because of low battery voltage (the CR10 program stops 
running when battery voltage is insufficient.  The data outage events were preceded and 
followed by several hours of bad/suspicious data.

• temp_trh_bottom
• rh_top_fraction
• temp_air_top
• temp_trh_top
• temp_air_bottom
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• soil_temp_2_rr
• atmos_pressure_mv
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_temp_3_rr
• soil_moisture_3_r
• soil_moisture_2_r
• lat
• soil_moisture_1_r
• temp_trh_right_rr
• soil_heat_flow_3_mv
• soil_moisture_5_r
• net_radiation_mv
• soil_moisture_1_rr
• alt
• rh_left_mv
• soil_moisture_4_r
• soil_heat_flow_4_mv
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr
• soil_heat_flow_2_mv
• base_time
• battery_voltage
• lon
• time
• temp_air_left
• rh_right_mv
• soil_moisture_3_rr
• soil_heat_flow_1_mv
• temp_air_right
• temp_trh_left_rr
• soil_moisture_2_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr
• soil_moisture_5_rr
• time_offset

• temp_air_top
• temp_air_bottom
• temp_trh_top
• bowen_ratio
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• temp_trh_bottom

SGP/EBBR/E20 - Incorrect Sensible and Latent Heat Fluxes - a result of low battery 
voltage.

Supply voltage sometimes dropped too low at night, causing incorrect measurements of 
sensible and latent heat fluxes, pressure, AEM home signal, and soil heat flow.

• Barometric Pressure(atmos_pressure)

• atmos_pressure_mv
• soil_heat_flow_3_mv
• soil_heat_flow_4_mv
• soil_heat_flow_5_mv
• home_signal
• soil_heat_flow_2_mv
• soil_heat_flow_1_mv

• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• home_signal_30
• home_signal_15
• Barometric Pressure(atmos_pressure)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• bowen_ratio

SGP/EBBR/E20 - Sensible and latent heat fluxes overestimated

Net Radiation was too large resulting in overestimated sensible heat and latent heat 
fluxes.

• Radiation, net(net_radiation)

• Radiation, net(net_radiation)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

EBBR - soil heat flux plate giving opposite sign

EDITOR'S NOTE: This DQR refers to data collected by the EBBR at E20 prior
to the begin date of regular ARM data.  At that time, the data streams which
contain the EBBR.E20 data were named
      Dsgp15ebbr6.a0
      Dsgp30ebbr6.a1
      Dsgp5ebbr6.a0
These data are not readily available from the ARM archive, but can be
made available by special request.  The actual time range of the problem
described here is 930405.0000-930429.2359.


Soil heat flux sensor #3 of EBBR6, at Meeker, Ok extended site was
determined by me to have one heat flux plate whose output was out of phase
with the other four.  The absolute value of the soil heat flux value
produced by the plate was good.  Normally, this condition is caused either
by improper wiring of the sensor into the data acquisition system (this was
checked by site operations personnel on 29 April; wiring convention was
correct) or by the plate being installed upside down.  The latter seems
fairly obvious, although the plate was not dug up to check it's orientation;
that is not neccesary and would be detrimental since it takes time for such
sensors to acclimate themselves to their soil environment.

The consequence of this problem is that 5 soil heat flux plate outputs were
being averaged, with one of the outputs being of opposite sign from the
other four.  Since the outputs are similar, in absolute terms, this
essentially resulted in an average soil heat flux plate value that is 40%
too low.  In terms of output, this a reduction of around 10 W per meters
squared, or 1-2% of the RN+G term during maximum solar insolation.  This is
clearly a small error.

Site operations personnel switched the soil heat flux plate leads to give
the proper sign of output, on 29 April 1993, time unknown (this can be
determined from looking at the ingested data later; it hasn't been ingested
yet).  The instrument operated properly at that point.  Thus, the problem
has been corrected.

• Barometric Pressure(atmos_pressure)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• lon
• temp_reference
• lat
• rh_top_fraction
• Radiation, net(net_radiation)
• temp_air_top
• temp_trh_top
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• home_signal
• alt
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• base_time
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• time_offset
• wdir_vec_std

• wdir_vec_std
• time_offset
• temp_air_top
• lat
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• home_signal_15
• temp_air_bottom
• temp_trh_top
• soil_heat_capacity_2
• soil_moisture_4
• soil_heat_capacity_3
• soil_moisture_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_heat_capacity_1
• soil_moisture_1
• surface_soil_heat_flux_5
• lon
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• alt
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• energy_storage_change_4
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Soil temperature mean 2(soil_temp_2)
• Barometric Pressure(atmos_pressure)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• vapor_pressure_top
• base_time
• temp_trh_bottom

SGP/EBBR/E20 - Blown fuse in AEM at E20

On October 30, 1993, before 1300 GMT, the fuse in the AEM (Automatic
Exchange Mechanism) of Meeker, Ok (E20) EBBR blew out.  The AEM remained
nonfunctional until the fuse was replaced just before 1600 GMT on
November 12, 1993.  This situation resulted in the following invalid data:

5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
          vp_top, vp_bot, home

15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, mv_home, tair_r,
           tair_l

30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot, bowen, e, h, home_15, home_30


If the biases of the sensors were know, bowen, h, and e could be
recalculated from the 15 minute and/or 5 minute data.  Since we will not
have any idea of what those biases are until an annual calibration of the
sensors can take place (which may be months away), the recalculations
cannot be performed at this time.  Furthermore, it may be invalid to use
sensor biases, if determined too far removed in time, due to the gradual
calibration drift of some of the sensors.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• home_signal
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• home_signal
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• home_signal_30
• home_signal_15
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Pressure Sensor Malfunction

Pressure sensor malfunction during attempt to monitor it during Preventative
Maintenance visit.  30 minute values of pressure for 1600 GMT and 1630 GMT,
15 minute values for 1600, 1615, and 1630, and 5 minute values for 1600,
1605, 1610, 1615, 1620, 1625, and 1630 GMT are incorrect.  However, the
range of the incorrect values was such as to not adversely affect flux
measurements.  Some noise was apparently induced in the pressure output
voltage as a result of the monitoring, although it is not known how.

• vapor_pressure_top
• Barometric Pressure(atmos_pressure)
• vapor_pressure_bottom

• alt

• vapor_pressure_bottom
• vapor_pressure_top
• Barometric Pressure(atmos_pressure)

SGP/EBBR/E20 - Fan Stopped, T and RH Biases

Another fan stoppage situation occurred.  This is the fourth one in the
last few months and may indicate a weakening of the fans that aspirate the
temperature, relative humidity housings.  The 15 minute data reveals that
the stoppage occurred at approximately 1300 GMT on September 12.  The left fan
was cleaned out by site operations personnel and began running again at
1847 GMT on September 14.  The 15 minute data during this period shows that
during daytime, the left temperature was greater than the right temperature and
that the left relative humidity was lower than the right relative humidity
(a consequence of greater temperature), irregardless of the positions of the
housings.  The bowen ratio, sensible heat flux and latent heat flux for this
period, as well as all left housing temperatures and relative humidities are
incorrect.  The data values that are incorrect are:

5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot

15 minute: rr_thum_l, mv_hum_l, tair_l,

30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, thum_bot,
           vp_top, vp_bot, bowen, e, h

Because of the increased frequency of fan stoppage occurrences, I have
submitted a work request to site operations to use the portable vane
anemometer to check the flow of the housing fans on each EBBR and visually
check (and clean if needed) the fans for debris that would restrict the
flow.  Included in this work request are instructions for checking the
performance of the temperature and relative humidity sensors by
manually putting the aspirator housings at the same height for a half hour
period (so that two 15 minute and one half hour comparison result).

The latter part of the work request is prompted by my close inspection of
the Meeker data for the last few weeks.  It is clear that significant
biases have developed in the pairs of temperature and relative humidity
sensors; left thermocouple ~0.5 deg. C greater than right thermocouple,
left relative humidity ~5% lower than right relative humidity.  Biases were
expected in operating the systems over long time periods, and these appear
to be the result of simple offsets, not changes in calibrations.
At this point, I just want to determine how large the offsets are.
Comparison of these offsets between EBBR units, in light of the different
lengths of time that EBBR units and individual sensors have been deployed,
may provide some interesting information on likely offset changes with time.

• temp_air_top
• temp_trh_top
• rh_bottom_fraction
• temp_trh_bottom
• temp_air_bottom
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• temp_air_left
• rh_left_mv
• temp_trh_left_rr

• temp_air_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• rh_bottom_fraction
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Net Radiometer Hemisphere Changes

Incorrect data during hemisphere change.

• Radiation, net(net_radiation)

• net_radiation_mv

• Radiation, net(net_radiation)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 - Net Radiometer Hemisphere Changes

The upper hemisphere of the net radiometer at the site was punctured
allowing water to collect in the lower (and sometimes upper) section of the sensor. The 
punctures are most likely the result of migratory birds (a problem that we have experienced 
almost every year here at ANL also). The punctures (and water in some net radiometers) 
did not result in obvious invalidation of the data.

Whether there is water in the lower hemisphere or not, a small puncture of the upper 
hemisphere would not have a major effect on the net radiation measurement.  Significant 
amounts of water in the lower
hemisphere should have a major effect on nighttime measurements particularly, although 
that effect is hard to detect in the data. 
The date when the puncture occurred is approximate - but is certainly 
no more than two weeks before the hemisphere was replaced.

• Radiation, net(net_radiation)

• net_radiation_mv

• Radiation, net(net_radiation)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 - Frozen Wind Speed Sensor

On March 7, 1995 freezing rain stopped the cups of the EBBR wind
speed instrument at Meeker, OK (E20).  All 5, 15, and 30
minute data values indicated below are incorrect for the period listed above.

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - AEM Home 30 Values Low

The first EBBR to achieve annual calibration changeout was Meeker, Ok, E20.
However, soon after changeout on August 9, 1995, the home 30 value dropped below
15, intermittently, to typically 0.3 to 0.5; this causes a data quality message
to be output in the site operations log as the stated acceptable range for home
30 is 15 to 34.999999.  However, no data is incorrect as a result of this
condition.

No replacement AEM is available, as the changeout kit AEMs are somewhat
different from the initial units.  Site operations hopes to have time to
diagnose the problem on the next PM visit and correct the problem.  At
present, data quality is not jeopardized.

I will submit another DQR or addendum when successful replacement of the
AEM is accomplished.

• Barometric Pressure(atmos_pressure)
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• lon
• temp_reference
• lat
• rh_top_fraction
• Radiation, net(net_radiation)
• temp_air_top
• temp_trh_top
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• home_signal
• alt
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• base_time
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• time_offset
• wdir_vec_std

• wdir_vec_std
• time_offset
• temp_air_top
• lat
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• home_signal_15
• temp_air_bottom
• temp_trh_top
• soil_moisture_4
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_moisture_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_2
• soil_heat_capacity_1
• soil_moisture_1
• surface_soil_heat_flux_5
• lon
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• alt
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• energy_storage_change_4
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Soil temperature mean 2(soil_temp_2)
• Barometric Pressure(atmos_pressure)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• vapor_pressure_top
• base_time
• temp_trh_bottom

SGP/EBBR/E20 - Temperature/RH Probes Malfunction and Replacement

Beginning on approximately October 1, 1996 the calibration of the temperature 
sensor in one or both T/RH probes began to drift; temperatures started to 
drift higher than the thermocouple probes.  This drift caused the upper and 
lower temperatures measured by the T/RH probe to be 2 to 10 degrees C greater 
than the thermocouple probes.  Comparison with adjacent EBBR sites shows 
that the thermocouples were measuring properly.  The problem affected the vapor 
pressure outputs primarily, making them as much as 1 kPa greater than they 
should be (vapor pressure is calculated from probe temperature and relative 
humidity).  The effect on sensible and latent heat fluxes was negligible, 
although latent heat flux may be overestimated by about 5% presently and 
sensible heat flux underestimated by approximately the same percentage.


Site operations replaced the T/RH probes on 8 May 1996; the new probes are 
performing well. The serial numbers of replaced probes are: Left 632415, 
Right 632356.  New probe serial numbers are: Left 460428, Right 460412.

• temp_trh_top
• temp_trh_bottom
• vapor_pressure_bottom
• vapor_pressure_top

• Raw data stream - documentation not supported

• temp_trh_left_rr
• temp_trh_right_rr

• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• temp_trh_bottom

SGP/EBBR/E20 - 3-month check

During EBBR 3-month checks the Automatic Exchange Mechanism is disabled
(reflected by home signals near zero) so that the two aspirator units can be
placed at the same height.  The measurements during this period, at least,
do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h),
or latent heat flux (e), nor do the air temperature and relative humidity
measurements indicate gradients.  Checks performed before or after the AEM
is disabled also lead to some incorrect data.  The period of incorrect
data for the EBBR is listed above; data times affected do not include the
beginning time and do include the ending time (data files are denoted by
the end time).

• temp_air_top
• temp_trh_top
• rh_bottom_fraction
• temp_trh_bottom
• temp_air_bottom
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• temp_air_bottom
• temp_trh_top
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• vapor_pressure_top
• bowen_ratio
• rh_bottom_fraction
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - EBBR 3 Month Checks - 10 EFs

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled 
(reflected by home signals near zero) so that the two aspirator units
can be placed at the same height.  The measurements during these periods 
do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), 
or latent heat flux (e), nor do the air temperature and relative humidity 
measurements indicate correct gradients.  Checks performed before or after the 
AEM is disabled also lead to some incorrect data.  Incorrect 5, 15 minute and 
half hour data occurs for periods indicated.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Wind Speed Cups Frozen

Freezing rain, snow, and below freezing conditions during 24 November 
1996 caused the wind speed sensor cups to freeze in a stopped state at E20, 
Meeker, OK.  On 25 November, the cups broke free of the ice and turned freely 
again. 

Measurements affected by the stalled wind speed sensor include:

5 minute:  wind_s, res_ws

15 minute: wind_s

30 minute: wind_s, res_ws

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - EBBR Biannual Checks

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled 
(reflected by home signals near zero) so that the two aspirator units
can be placed at the same height.  The measurements during these periods 
do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), 
or latent heat flux (e), nor do the air temperature and relative humidity 
measurements indicate correct gradients.  Checks performed before or after the 
AEM is disabled also lead to some incorrect data.  Incorrect 5, 15 minute and 
half hour data occurs for periods indicated.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20- EBBR Frozen Wind Speed

Wind speed cups were frozen during the indicated time periods. All 5,
15, and 30 minute data values indicated  are incorrect for the periods
listed.

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown)

The EBBR AEM stopped exchanging because of icing at during this time
period.

The calculations of Bowen ratio, latent heat flux, and sensible heat
flux are incorrect for the time period indicated.  The other
measurements listed  are also incorrect for those times:

Note: Mentor supplied the end date/time to this DQR after submission.

• temp_air_top
• temp_trh_top
• temp_trh_bottom
• temp_air_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Wind Speed Sensor Frozen

The wind speed sensor was frozen during the period.  

Data values that were incorrect are:

 5 minute: wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Raw data stream - documentation not supported

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - 3 Month Check

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled
(reflected by home signals near zero) so that the two aspirator units can be
placed at the same height.  The measurements during these periods 
do not produce correct outputs of bowen ratio (bowen), sensible heat flux
(h), or latent heat flux (e), nor do the air temperature and relative 
humidity measurements indicate correct gradients.  Checks performed before 
or after the AEM is disabled also lead to some incorrect data.  Incorrect 5,
15 minute and half hour data occurs for the period above.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• soil_moisture_4
• soil_moisture_5
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Six Month Checks

During EBBR 6 month checks (formally called 3 month checks) the Automatic 
Exchange Mechanism is disabled (reflected by home signals near zero) so that
the two aspirator units can be placed at the same height.  The measurements
during these periods do not produce correct outputs of bowen ratio (bowen), 
sensible heat flux (h), or latent heat flux (e), nor do the air temperature
and relative humidity measurements indicate correct gradients.  Checks 
performed just before or after the AEM is disabled also lead to some 
incorrect data.  Incorrect 5, 15 minute and half hour data occurs for the 
period above.

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Wind Speed Incorrect

On 3 July 1998 the cup anemometer lost a cup. Until the cup
assembly was replaced by site ops personnel on 15 July 1998,
wind speed and vector averaged wind speed data were incorrect.
The values affected are listed below.

 5 minute: wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Incorrect Data - Cattle Vandalism

Cattle penetrated the electric fence and pulled the aspirator housings
from the AEM.  Thus T/RH/VP and sensible and latent heat fluxes are
incorrect for the period (until 1540 GMT; LE and H through the 30 minute
period ending at 1600 GMT)

• temp_air_top
• temp_trh_top
• temp_air_bottom
• temp_trh_bottom
• rh_bottom_fraction
• rh_top_fraction
• vapor_pressure_bottom
• vapor_pressure_top

• rh_left_mv
• temp_air_left
• rh_right_mv
• temp_air_right
• temp_trh_left_rr
• temp_trh_right_rr

• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• temp_air_top
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• rh_bottom_fraction
• temp_air_bottom
• temp_trh_top
• vapor_pressure_top
• bowen_ratio
• rh_top_fraction
• temp_trh_bottom

SGP/EBBR/E20 - Wind Direction Data Incorrect (revised)

The wind direction sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  res_ws, wind_d, sigma_wd
15 minute: mv_wind_d
30 minute: res_ws, wind_d, sigma_wd

• Wind speed vector mean(wspd_vec_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Wind Direction Data Incorrect

The wind direction sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  res_ws, wind_d, sigma_wd
15 minute: mv_wind_d
30 minute: res_ws, wind_d, sigma_wd

• Wind speed vector mean(wspd_vec_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std

• wdir_vec_mean_mv

• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Wind Speed Data Incorrect

The wind speed sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws,

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Wind Speed Data Incorrect

The wind speed sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws,

• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)

SGP/EBBR/E20 - Data Incorrect

Version 6 of the CR10 program was installed during this period instead of
version 7 (the initial version 7 program did not work).  The calibrations 
and coefficients in version 6 were incorrect; therefore all 
data during this period is of questionable quality and e and h are clearly
incorrect.  The correct version 7 program was installed on 29 Dec 1998.

• Barometric Pressure(atmos_pressure)
• lon
• temp_reference
• temp_air_top
• temp_trh_top
• home_signal
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• base_time
• Wind speed vector mean(wspd_vec_mean)
• temp_trh_bottom
• lat
• rh_top_fraction
• Radiation, net(net_radiation)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• temp_air_bottom
• alt
• rh_bottom_fraction
• vapor_pressure_bottom
• vapor_pressure_top
• time_offset
• wdir_vec_std

• Raw data stream - documentation not supported

• atmos_pressure_mv
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• wdir_vec_mean_mv
• soil_moisture_3_r
• soil_moisture_2_r
• soil_moisture_1_r
• soil_heat_flow_3_mv
• net_radiation_mv
• rh_left_mv
• soil_heat_flow_4_mv
• soil_heat_flow_2_mv
• base_time
• battery_voltage
• temp_air_left
• rh_right_mv
• temp_air_right
• time_offset
• soil_temp_2_rr
• home_signal
• soil_temp_3_rr
• lat
• temp_trh_right_rr
• soil_moisture_5_r
• alt
• soil_moisture_4_r
• soil_heat_flow_5_mv
• soil_temp_4_rr
• lon
• soil_heat_flow_1_mv
• temp_trh_left_rr
• temp_reference_rr
• soil_temp_1_rr
• soil_temp_5_rr

• temp_air_top
• home_signal_15
• temp_air_bottom
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_1
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• alt
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 1(soil_temp_1)
• Barometric Pressure(atmos_pressure)
• Soil temperature mean 2(soil_temp_2)
• soil_heat_flow_1
• soil_heat_flow_3
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• base_time
• temp_trh_bottom
• wdir_vec_std
• time_offset
• lat
• corr_soil_heat_flow_5
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• Radiation, net(net_radiation)
• rh_bottom_fraction
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• temp_trh_top
• soil_moisture_4
• soil_moisture_3
• soil_moisture_5
• temp_reference
• bowen_ratio
• rh_top_fraction
• soil_moisture_2
• Wind speed vector mean(wspd_vec_mean)
• soil_moisture_1
• lon
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_1
• surface_soil_heat_flux_4
• surface_soil_heat_flux_3
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• vapor_pressure_bottom
• home_signal_30
• energy_storage_change_1
• energy_storage_change_3
• energy_storage_change_2
• energy_storage_change_5
• energy_storage_change_4
• vapor_pressure_top

SGP/EBBR/E20 - Pressure Low

The pressure sensor values dropped several kPa on 13 January 1999 because 
of a sensor malfunction and remained that way until the sensor was 
replaced on 10 February 1999.  Comparison of the pressure before and after
the problem period shows that Bowen ratio was underestimated by 
approximately 6% during the period, resulting in a 6% overestimation of
latent heat flux and a 6% underestimation of sensible heat flux.  
Adjustment of the flux data during the period by these amounts should be
made by the data user.

• Barometric Pressure(atmos_pressure)
• vapor_pressure_top
• vapor_pressure_bottom

• atmos_pressure_mv

• vapor_pressure_bottom
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)
• vapor_pressure_top
• bowen_ratio
• Barometric Pressure(atmos_pressure)
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)

SGP/EBBR/E20 - Air Temperature Incorrect

Right air temperature (15 minute) and top and bottom air temperatures 
(5 and 30 minute) during this period are incorrect because the right air
temperature sensor was not working.

• temp_air_top
• temp_air_bottom

• temp_air_right

• temp_air_bottom
• temp_air_top