SGP/EBBR - EBBR E12 Anemometer Cups Frozen, Wind Speed Incorrect

The anemometer cups were frozen stalled during this period.

The following values were therefore 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)

SGP/EBBR - EBBR E12 Net Radiation Incorrect

Condensation inside the domes (possibly water in the bottom dome also) 
during the period made daytime net radiation values as much as 50% too 
large and nighttime net radiations as much as 100% too small.  

The affected data are:

5 minute:  q
15 minute: mv_q
30 minute: q, h, e

• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR - EBBR E12 Net Radiation Incorrect

The net radiometer top dome was broken and water had entered.  Net 
radiation values are therefore incorrect during the period.

The affected data are:

5 minute:  q
15 minute: mv_q
30 minute: q, h, e

• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR/E12 - EBBR E12 Wind Speed Iced

The anemometer was frozen stopped by freezing rain; the indicated data is incorrect.

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

SGP/EBBR/E12 - EBBR E12 Wind Speed Iced

The anemometer was frozen stopped by freezing rain; the indicated data is incorrect.

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

SGP/EBBR/E12 - E12 EBBR Wind Direction Incorrect

The wind direction vane was frozen stopped in one direction by icing.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - E12 EBBR Wind Speed Incorrect

The wind speed sensor cups were frozen stopped by icing.

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

SGP/EBBR/E12 - E12 EBBR AEM Stuck - Data Incorrect

The AEM became stuck between levels, causing all gradient measurements to be incorrect, 
and thus the latent and sensible heat fluxes and Bowen ratio.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• vapor_pressure_top
• Latent heat flux(latent_heat_flux)
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• temp_trh_top
• Sensible heat flux(sensible_heat_flux)

SGP EBBR E12 - E12 EBBR Data Incorrect During 6 Month Checks

The data was incorrect during the 6 month checks.

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

SGP EBBR E12 - E12 EBBR Data Incorrect From AEM In One Position

The AEM kept stopping in one position. Offset biases are not removed from the 
gradient data in this situation and the data indicated is therefore incorrect.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• temp_trh_top
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - 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.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - 6 Month Checks

The indicated measurements were incorrect during the 6 month checks.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - AEM Hung

The automatic exchange mechanism did not exchange properly, causing other measurements to 
be incorrect.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - Measurements Incorrect

All measurements were incorrect or offscale for an unknown reason.

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

SGP/EBBR/E12 - Resistance Measurements Incorrect

All sensors that depend on resistance measurements are incorrect.
Average soil heat flow, sensible heat flux, and latent heat flux are incorrect as a 
result.

This condition normally occurs when the reference temperature sensor is disconnected or 
bad.

• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• vapor_pressure_bottom
• temp_trh_bottom
• temp_trh_top
• energy_storage_change_5
• temp_reference
• energy_storage_change_3
• energy_storage_change_4
• bowen_ratio
• corr_soil_heat_flow_1
• corr_soil_heat_flow_2
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_3
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_4
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• Soil temperature mean 1(soil_temp_1)
• soil_moisture_1
• Latent heat flux(latent_heat_flux)
• surface_soil_heat_flux_1
• vapor_pressure_top
• surface_soil_heat_flux_4
• soil_moisture_5
• surface_soil_heat_flux_5
• soil_moisture_4
• soil_moisture_3
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_moisture_2
• soil_heat_capacity_2
• soil_heat_capacity_1
• energy_storage_change_1
• soil_heat_capacity_5
• energy_storage_change_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Reprocess: Soil Temperature #3 Incorrect

Soil Temperature #3 was flaky primarily during nighttime hours and sometimes during early 
daylight hours.  Average soil heat flow, sensible heat flux, and latent heat flux are 
also affected; these can be recalculated using the remaining good sets of soil sensors as 
follows:

The heat fluxes can be recalculated by using soil sets 1, 2, 4, and 5 as follows:
     ave_shf = (g1 + g2 + g4 + g5)/4
     e = -(q + ave_shf)/(1 + bowen)
     h = -(q + e + ave_shf)

• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Soil temperature mean 3(soil_temp_3)
• energy_storage_change_3
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• surface_soil_heat_flux_3

SGP/EBBR/E12 - Wind Direction Incorrect

The wind direction measurement was zero, in the 50s, or always less than 180 degrees.

A DQPR has been issued to resolve the problem.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - Reprocess: Soil Moisture 4 and 5 Incorrect

Soil moisture measurements from sets 4 and 5 were incorrect, leading to many other 
incorrect measurements calculated using them.

Average soil heat flow, sensible heat flux, and latent heat flux are affected; these can 
be recalculated using the remaining good sets of soil sensors as follows:
    ave_shf = (g1 + g2 + g3)/3
    e = -(q + ave_shf)/(1 + bowen)
    h = -(q + e + ave_shf)

Note:  D020717.6 reports Soil temperature sensor #3 was also bad during this
time, but for the very specific records affected by the soil moisture #4 and
#5 reporting incorrectly, soil temp #3 was okay.  Therefore the equations
given are correct.

• soil_heat_capacity_5
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• soil_heat_capacity_4
• corr_soil_heat_flow_4
• corr_soil_heat_flow_5
• Latent heat flux(latent_heat_flux)
• soil_moisture_5
• surface_soil_heat_flux_4
• surface_soil_heat_flux_5
• soil_moisture_4
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Reprocess: Soil Moisture 2 and 5 Incorrect

Soil moisture measurements from sets 2 and 5 were incorrect, leading to many other 
incorrect measurements calculated using them.

Average soil heat flow, sensible heat flux, and latent heat flux are affected; these can 
be recalculated using the remaining good sets of soil sensors as follows:
    ave_shf = (g1 + g3 + g4)/3
    e = -(q + ave_shf)/(1 + bowen)
    h = -(q + e + ave_shf)

Note:  D020717.6 reports Soil temperature sensor #3 was also bad during this
time, but for the very specific records affected by the soil moisture #2 and
#5 reporting incorrectly, soil temp #3 was okay.  Therefore the equations
given are correct.

• soil_heat_capacity_2
• corr_soil_heat_flow_2
• soil_heat_capacity_5
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• corr_soil_heat_flow_5
• Latent heat flux(latent_heat_flux)
• soil_moisture_5
• surface_soil_heat_flux_5
• Sensible heat flux(sensible_heat_flux)
• surface_soil_heat_flux_2
• soil_moisture_2

SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR 
Header

The units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in the 
EBBR 30 minute netcdf header have been incorrect from the beginning 
of processing the data into netcdf files.  The correct units are 
MJ/m^3/C.

This does not affect the data quality.

• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_capacity_5
• soil_heat_capacity_4
• soil_heat_capacity_3

SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR 
Header

The units for Soil Heat Capacity (cs1, cs2, cs3, cs4,
cs5) in the EBBR 30 minute netcdf header have been 
incorrect from the beginning of processing the data
into netcdf files.  The correct units are MJ/m^3/C.
   
This does not affect the data quality.

(NOTE: The actual begin date of some of these data streams
 is as early as 7/4/93.  This DQR applies to all 30m EBBR
 data.)

• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_capacity_5
• soil_heat_capacity_4
• soil_heat_capacity_3

SGP/EBBR/E12 - Data Incorrect during 6 month checks

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

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - 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.

• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• vapor_pressure_bottom
• energy_storage_change_5
• temp_reference
• energy_storage_change_3
• energy_storage_change_4
• bowen_ratio
• corr_soil_heat_flow_1
• corr_soil_heat_flow_2
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_3
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_4
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• Soil temperature mean 1(soil_temp_1)
• soil_moisture_1
• Latent heat flux(latent_heat_flux)
• surface_soil_heat_flux_1
• vapor_pressure_top
• surface_soil_heat_flux_4
• soil_moisture_5
• surface_soil_heat_flux_5
• soil_moisture_4
• soil_moisture_3
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_moisture_2
• soil_heat_capacity_2
• soil_heat_capacity_1
• energy_storage_change_1
• soil_heat_capacity_5
• energy_storage_change_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Wind Direction Incorrect

The wind direction and residual wind speed measurements are incorrect.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - Data zero following Logger Restart

Most of the measurements were zero, which normally happens after a 
datalogger restart.  The restart on 08/16/02 occurred after an EBBR
unit changeout.

• vapor_pressure_bottom
• Net radiation(net_radiation)
• vapor_pressure_top
• soil_heat_flow_5
• surface_soil_heat_flux_1
• soil_heat_flow_4
• soil_heat_flow_3
• surface_soil_heat_flux_4
• home_signal_30
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_2
• soil_heat_capacity_5
• soil_heat_flow_2
• rh_bottom_fraction
• soil_heat_capacity_4
• soil_heat_capacity_3
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• temp_reference
• energy_storage_change_3
• energy_storage_change_4
• rh_top_fraction
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_2
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_3
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_4
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• Atmospheric pressure(atmos_pressure)
• soil_moisture_5
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Battery Voltage Low

Normally, when Battery Voltage drops below 10.5 volts, most 
measurements are suspect and some are often incorrect.
In this particular case, some of the data is suspect when
the battery voltage is below 11.0 volts.

Soil Heat Flow #3 is normally affected first, with other 
measurements following at lower voltages.

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

SGP/EBBR/E12 - AEM Stuck in One Position

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

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Reprocess: Net Rad Calibration Coefficients

The Net Radiometer coefficients were incorrect in the CR10
program when the replacement EBBR unit was installed on
08/16/02.

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

• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR/E12 - Data Mostly Zero Following Logger Restart

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

The restart on 12/10/02 occurred after a CR10
program change of net radiometer coefficients 
and subsequent restart of the CR10.

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

SGP/EBBR/E12 - AEM Hung Inbetween Home Positions

The AEM was hung inbetween home positions, causing many measurements to be incorrect.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 -  6 Month Checks

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

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12  - 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.

• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR/E12 - Pressure Sensor Measurement Scales With Battery Voltage

The barometer output was scaling with supply voltage (i.e. it 
               followed the charging of the battery by the solar panel).

               NOTE: The barometer was replaced later than the end date of 
               this DQR.  Why the problem ended on 26 Nov 2003 is unclear; 
               there was no site ops intervention on that date.

               The problem did not affect the sensible and latent heat flux 
               calculations beyond the expected system error.

• Atmospheric pressure(atmos_pressure)

SGP/EBBR/E12 - 6 Month Checks

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

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• temp_trh_top
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Pressure Sensor Measurement Scales With Battery Voltage

The barometer output scaled with supply voltage (it followed the charging of the battery 
by the solar panel).

The problem did not affect the sensible and latent heat flux calculations
beyond the expected system error.

• Atmospheric pressure(atmos_pressure)

SGP/EBBR/E12  - 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)

SGP/EBBR/E12  - 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)

SGP/EBBR/E12  - 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 mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - Incorrect Times

The ntpd server (time adjustment) stopped working on Feb. 19th at 22:12:16 GMT, and the 
clock was corrected by -5600.177269 seconds on March 10th at 22:47 GMT. The recorded times 
for observations are off by amounts ranging from 0 seconds on Feb. 19th to 5600 seconds 
on March 10th.

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

SGP/EBBR/E12 - 6 Month Checks

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

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - AEM home_15 Incorrect, Flux Measurements not affected

The home_15 measurement was incorrect during much of the stated period.
The AEM was exchanging however, and thus the flux measurements were not affected.

• home_signal_15

SGP/EBBR/E12  - 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)

SGP/EBBR/E12  - 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 mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12  - 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)

SGP/EBBR/E12  - 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 mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - Wind Speed and Direction Frozen by Ice Storm

The wind speed and direction sensors were frozen by ice from and ice storm.

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

SGP/EBBR/E12 - Improved EBBR CR10 Program

Effective 20050329.1830, the EBBR.E12 CR10 program was revised to improve 
the quality of the primary measurements as follows:
   
1) An RMS procedure is used to determine max and min limits of acceptable
soil heat flow.  This is applied to the individual soil sets.  Measurements
outside the limits are rejected and the measurements within the limits are
used to calculate the average soil heat flow.
   
2) Max and min limits are used to determine incorrect values of net
radiation, sensible heat flux (h), latent heat flux (e), and automatic
exchange mechanism (AEM) signal.  If AEM signal is outside the limits, h 
and e are set to 999s.  If net radiation is outside the limits, h and e are 
set to 999s. If h or e are outside the limits, h and e are set to 999s.
   
Virtually no incorrect soil measurement will affect the primary 
measurements of h and e.
   
By setting h and e to 999s, it can be easily seen that the primary 
variables are incorrect; no other interpretation is possible.
   
Prior to 20050329, the improved CR10 program was NOT in effect.  DQRs have
been submitted for known instances of incorrect soil measurements which
affected the quality of the primary measurements of h and e.
   
Note: the DQR begin date is the begin date of the sgp30ebbrE12.b1 data
stream.  The earlier version of the CR10 program was also used on previous
EBBR datastream names (e.g. sgp30ebbrE12.a1).

• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Average Soil Heat Flux Incorrect

A typo in the version 9 EBBR program caused average soil heat flow to be zero, resulting 
in both sensible and latent heat fluxes being approximately 20 watts per meter squared too 
large during the middle of the day.

• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - metadata corrections

On 20050723, a series of metadata corrections and additions were completed.  These 
metadata changes apply to all EBBR.E12 data collected by ARM back to the installation of the 
instrument in August 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 type
4) Correction of soil moisture units (from "by volume" to "gravimetric")

• base_time

SGP/EBBR/E12 - Sensible and Latent Heat Fluxes Incorrect at Times

Large spikes in soil temperature #2 are causing the soil heat storage
term to blow up, and thus the average soil heat flow, sensible heat flux, 
and latent heat flux to be incorrect at times.

• energy_storage_change_2
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• surface_soil_heat_flux_2

SGP/EBBR/E12 - Multiplexer failure

Sensible and latent heat fluxes are incorrect during a period when multiplexer #2 
experienced a failure.

• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• soil_moisture_1
• soil_heat_flow_5
• vapor_pressure_top
• surface_soil_heat_flux_1
• Latent heat flux(latent_heat_flux)
• vapor_pressure_bottom
• soil_heat_flow_4
• soil_heat_flow_3
• Atmospheric pressure(atmos_pressure)
• surface_soil_heat_flux_4
• soil_moisture_5
• soil_moisture_4
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• soil_moisture_3
• soil_moisture_2
• surface_soil_heat_flux_3
• soil_heat_flow_1
• soil_heat_flow_2
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR/E12 - Fluxes and Gradient Measurements Incorrect

The AEM hung in one position; therefore the fluxes and gradient measurements were 
incorrect.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• temp_trh_top
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Net Radiation, and Sensible and Latent Heat Fluxes Incorrect

Rain entered into the net radiometer through a broken top dome.  Most of the net radiation 
values during the period are much too large, thus sensible and latent fluxes are also 
too large.

• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR/E12 - Soil Temperature #1 Incorrect

During much of this period soil temperature #1 was offscale or erratic.
Sensible and latent heat fluxes were not ususally affected.

• soil_heat_capacity_1
• energy_storage_change_1
• Soil temperature mean 1(soil_temp_1)
• surface_soil_heat_flux_1

SGP/EBBR/E12 - Wind Speed Incorrect

The wind speed sensor was stopped by freezing rain.

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

SGP/EBBR/E12 - Wind Speed Sensor Frozen Stopped by Icing

Icing stopped the wind speed sensor cups and resulted in the measurement of wind speed 
being equivalent to the sensor offset.

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

SGP/EBBR/E12 - Intermittent data loss

The datalogger at E12 EBBR reset it's time to Dec 3, 1999 on a periodic basis.  This 
occurred on 5/3, 5/15, 5/17, 5/18, 5/27, 6/5 and 6/6 of 2010. Each time this occurred we lost 
1-2 hours of data.

The datalogger was apparently at fault.  The problem has not re-occurred since the 
datalogger was replaced on 6/8/2010.

• vapor_pressure_bottom
• North latitude(lat)
• East longitude(lon)
• Net radiation(net_radiation)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• time
• vapor_pressure_top
• soil_heat_flow_5
• surface_soil_heat_flux_1
• soil_heat_flow_4
• soil_heat_flow_3
• surface_soil_heat_flux_4
• home_signal_30
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_2
• rh_bottom_fraction
• soil_heat_capacity_5
• soil_heat_flow_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• Altitude above mean sea level(alt)
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• temp_reference
• energy_storage_change_3
• energy_storage_change_4
• rh_top_fraction
• time_offset
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_2
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_3
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_4
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• Atmospheric pressure(atmos_pressure)
• soil_moisture_5
• base_time
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Sensible and Latent Heat Fluxes and Other Measurements Incorrect

The power supply leads for the combined temperature probe shorted somehow, resulting in 
several measurements from the probe and for the multiplexer that it was connected to, to be 
incorrect.

• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• energy_storage_change_5
• temp_reference
• energy_storage_change_3
• energy_storage_change_4
• corr_soil_heat_flow_1
• corr_soil_heat_flow_2
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_3
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_4
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• Soil temperature mean 1(soil_temp_1)
• soil_moisture_1
• Latent heat flux(latent_heat_flux)
• surface_soil_heat_flux_1
• soil_moisture_5
• surface_soil_heat_flux_4
• surface_soil_heat_flux_5
• soil_moisture_4
• soil_moisture_3
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_moisture_2
• soil_heat_capacity_2
• soil_heat_capacity_1
• energy_storage_change_1
• soil_heat_capacity_5
• energy_storage_change_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Net radiation too high

Net radiation was too high, resulting in overestimated sensible and latent heat fluxes. 

Net rad domes replaced.

• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR/E12 - Loose connection (SHF #4)

Soil Heat Flow #4 was sometimes offscale due to a bad connection.  Sensible and latent 
heat fluxes also affected at times.

• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• corr_soil_heat_flow_4
• Latent heat flux(latent_heat_flux)
• soil_heat_flow_4
• surface_soil_heat_flux_4
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Soil heat flux #4 intermittently incorrect

Soil heat flux #4 measurements were sometimes incorrect and sometimes affected the 
sensible and latent heat flux calculations.

• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• corr_soil_heat_flow_4
• Latent heat flux(latent_heat_flux)
• soil_heat_flow_4
• surface_soil_heat_flux_4
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Sensible and Latent heat fluxes incorrect

The air and T/RH measurements were incorrect at times.  Loose RH/temp connection was 
reseated.

• temp_air_top
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - Sensible and latent heat fluxes intermittently incorrect

Soil temperature 1 and soil moisture 1 fluctuated unnaturally, spiking to large values at 
times. 

Sensible and latent heat flux measurements were therefore sometimes incorrect.

• soil_heat_capacity_1
• corr_soil_heat_flow_1
• energy_storage_change_1
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• surface_soil_heat_flux_1
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Net rad too high

The net radiometer measurements were too large and therefore resulted in incorrect 
sensible and latent heat flux measurements.

• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR/E12 - AEM failure

An AEM failure caused incorrect sensible and latent heat fluxes.

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Soil temp 1 erratic

Soil temperature sensor 1 produced erratic data at times; sensible and latent heat fluxes 
were incorrect at these times.

• energy_storage_change_1
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• surface_soil_heat_flux_1
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Multiplexer/datalogger problems

The AEM did not operate correctly at times. Sensible and latent heat fluxes were sometimes 
affected.

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Intermittent spikes in soil temp 1

Soil Temperature 1 spikes upward at times, sometimes affecting the sensible and latent 
heat fluxes.

• bowen_ratio
• energy_storage_change_1
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• surface_soil_heat_flux_1
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Soil heat flow incorrect

Soil heat flow 1 exhibited a larger range than sensors 2-5. 

However, this did not have a significant effect on sensible and latent heat fluxes.

• corr_soil_heat_flow_1
• soil_heat_flow_1
• surface_soil_heat_flux_1

SGP/EBBR/E12 - Sensible and Latent Heat Fluxes Incorrect

Sensible and Latent heat fluxes were incorrect when the AEM was not switching.

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Sensible and Latent Heat Fluxes Incorrect

The AEM stopped working, resulting in sensible and latent heat fluxes being incorrect.

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Missing Data

All data missing for these periods.

• vapor_pressure_bottom
• North latitude(lat)
• East longitude(lon)
• Net radiation(net_radiation)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• time
• soil_heat_flow_5
• surface_soil_heat_flux_1
• vapor_pressure_top
• soil_heat_flow_4
• soil_heat_flow_3
• surface_soil_heat_flux_4
• home_signal_30
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_2
• rh_bottom_fraction
• soil_heat_capacity_5
• soil_heat_flow_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• Altitude above mean sea level(alt)
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• temp_reference
• energy_storage_change_3
• energy_storage_change_4
• rh_top_fraction
• time_offset
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_2
• corr_soil_heat_flow_3
• Soil temperature mean 4(soil_temp_4)
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_4
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• Atmospheric pressure(atmos_pressure)
• soil_moisture_5
• base_time
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Sensible and Latent Heat Fluxes Incorrect

The fluxes are incorrect when the AEM was not working.

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Sensible and Latent Heat Fluxes Incorrect

Sensible and latent heat fluxes incorrect at times when AEM not working properly.

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP ALL INSTRUMENTS - Icing Event

An icing event (winter storm Cara) passed slowly through the area during this time frame.  
Instruments at the SGP may have been affected by ice accumulation.

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

SGP/EBBR/E12 - Sensible and Latent Heat Fluxes Incorrect

Sensible and Latent Heat Fluxes were incorrect during this period because icing of the AEM 
prevented it from exchanging.

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP Site Power Outage Due to Winter Storm

On Saturday and Sunday, December 26 and 27th a powerful winter storm (Goliath) brought 
sleet and freezing rain to much of Oklahoma with wind gusts of 45 MPH at times. The result 
was very very slick roads and mass power outages.
 
The SGP central facility lost power at 8:55 PM CDT on Sunday, December 27th.  
The power was restored on 7:56 PM CDT on Wednesday, December 30th
 
Site Emergency procedures were activated and Technicians drained water out of instrument 
reservoirs and other measures as needed, early Monday morning.
 
On Wednesdays as roads and power started was restored to much of the areas east of I-35 , 
Site Technicians performed maintenance on several Extended Facilities.

During this period, data are potentially missing, incorrect, or suspect.  Carefully 
inspect the data before use.

• vapor_pressure_bottom
• North latitude(lat)
• East longitude(lon)
• Net radiation(net_radiation)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• time
• surface_soil_heat_flux_1
• soil_heat_flow_5
• vapor_pressure_top
• soil_heat_flow_4
• soil_heat_flow_3
• home_signal_30
• surface_soil_heat_flux_4
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• energy_storage_change_1
• soil_heat_flow_1
• soil_heat_flow_2
• rh_bottom_fraction
• energy_storage_change_2
• soil_heat_capacity_5
• soil_heat_capacity_4
• soil_heat_capacity_3
• Altitude above mean sea level(alt)
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• energy_storage_change_3
• temp_reference
• energy_storage_change_4
• rh_top_fraction
• time_offset
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• corr_soil_heat_flow_2
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_3
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_4
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• soil_moisture_5
• Atmospheric pressure(atmos_pressure)
• base_time
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Wind Direction Malfunction

For the period indicated, a malfunction in the E12 EBBR wind direction
sensor caused the following data values to be incorrect:

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

Wind direction normally indicated small values (15 to 25 degrees) from 3 July
1995 at 0600 GMT through 6 July 1995 at 1500 GMT (at which time the sensor
was removed).  No sensor was in place between 6 July 1995 at 1500 GMT and 7
July 1995 at 1605 GMT (at which time a new sensor was installed).
 Old sensor S/N K3039, new S/N K3033.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - AEM Failure

As noted in a previous DQR, the home signal values at E12, Pawhuska, OK
began decreasing in July.  At the beginning of the period listed, the home
30 value dropped below 15; 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.  No data is incorrect as a result of this condition.

The home 15 value dropped below 35 beginning July 21, 1995, sometime after
2000 GMT; this causes a data quality message to be output in the site
operations log as the stated acceptable range for home 15 is 35 to
70.  Data is incorrect as a result of this condition, that being 30 minute e,
h, and bowen.

The home values frequently dropped below their proper levels until 10 August,
1995, at some time after 1100 GMT, when the set screws in the AEM would no
longer hold and the aspirator units were stranded inbetween the home
positions.  Thereafter, the reported home signals were negative.  All 30
minute e, h, and bowen data are incorrect for this condition.

On August 16, 1995, at about 1600 GMT, site operators determined that they
could not repair the AEM on-site and they determined that the replacement AEM
that they took with them has an electronic short.  Therefore, the AEM was
left in manual mode (no exchange).  Replacement of the AEM will not take
place until a working spare is available and all 30 minute e, h, and bowen
data will be incorrect until then.

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

• home_signal_15
• bowen_ratio
• Latent heat flux(latent_heat_flux)
• home_signal_30
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Wind Direction Malfunction

For the period above, a malfunction in the E12 EBBR wind direction
sensor caused the wind direction to output a constant 212 degrees.  Site
operations replaced the sensor (S/N K3033) with K3042.  The following data
values are incorrect for the period listed:

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

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - AEM replacement

Please see DQR P950816.2, where this problem was first documented.

As noted in a previous DQR, the home signal values at E12, Pawhuska, OK
began decreasing in July.  At the beginning of the period listed, the home
30 value dropped below 15; 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.  No data is incorrect as a result of this condition.

The home 15 value dropped below 35 beginning July 21, 1995, sometime after
2000 GMT; this causes a data quality message to be output in the site
operations log as the stated acceptable range for home 15 is 35 to
70.  Data is incorrect as a result of this condition, that being 30 minute e,
h, and bowen.

The home values frequently dropped below their proper levels until 10 August,
1995, at some time after 1100 GMT, when the set screws in the AEM would no
longer hold and the aspirator units were stranded inbetween the home
positions.  Thereafter, the reported home signals were negative.  All 30
minute e, h, and bowen data are incorrect for this condition.

On August 16, 1995, at about 1600 GMT, site operators determined that they
could not repair the AEM on-site and they determined that the replacement AEM
that they took with them has an electronic short.  Therefore, the AEM was
left in manual mode (no exchange).  All 30 minute e, h, and bowen data are
incorrect until the end of the period listed above.

On 13 September 1995 site operations personnel replaced the AEM
(old S/N 92005, new S/N 94008).  The new AEM would not exchange when the
right sensor was in the home position: this was confirmed on 14 September
when site operations personnel again visited the site.  However, soon after
the site operations personnel left Pawhuska on 14 September (at 1810 GMT),
the AEM started to exchange properly (data correct for 1900 GMT and after).
The AEM continues to operate properly.

• home_signal_15
• bowen_ratio
• Latent heat flux(latent_heat_flux)
• home_signal_30
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - AEM Failure/Right Radiation Shield OFF

On 18 November 1995 the AEM at E12, Pawhuska, OK stopped exchanging, with
the right radiation shield at the bottom position.  The 30 minute home
signal reflects this condition.  During the 21 November PM visit, the site
operators also found that the right radiation shield was no longer attached
to the AEM, but was dangling by its conduit.  It is not clear whether both
conditions occurred simultaneously.  Comparison of E12 data with that at
the Central Facility indicates that E12 data was correct on 17 November.

The AEM had stopped exchanging because a transistor became unsoldered from
the AEM circuit board.  Site operators repaired this and reattached the
right radiation shield to bring the system to operational status at 2130
GMT.

All 30 minute latent heat (e), sensible heat (h), and Bowen ratio (bowen)
data during the period above are incorrect.

• bowen_ratio
• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Wind Speed Cups Frozen

Freezing rain, snow, and below freezing conditions during 18 and 23 January 
1996 caused the wind speed sensor cups to freeze in a stopped state at E12, 
Pawhuska, OK.  The cups were freed up later on 18 January when the wind speed 
rose to above 10 meters per second.  When temperatures rose to above freezing 
on 24 January 1996, the ice thawed and the cups 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)

SGP/EBBR/E12 - 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).

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - 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.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - Annual Calibration Changeout

On 9 October 1996 the EBBR changeout for annual calibration occurred at 
E12, Pawhuska, OK.  SEBS unit 10 was removed and unit 1 was installed.  Between 
1000 and 1500 GMT no data was collected.  Data for half hours 1530-2000 GMT is 
incorrect; 3 month calibration checks were being performed.

• vapor_pressure_bottom
• North latitude(lat)
• East longitude(lon)
• Net radiation(net_radiation)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• vapor_pressure_top
• soil_heat_flow_5
• surface_soil_heat_flux_1
• soil_heat_flow_4
• soil_heat_flow_3
• surface_soil_heat_flux_4
• home_signal_30
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_2
• rh_bottom_fraction
• soil_heat_capacity_5
• soil_heat_flow_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• Altitude above mean sea level(alt)
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• energy_storage_change_3
• temp_reference
• energy_storage_change_4
• rh_top_fraction
• time_offset
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_2
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_3
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_4
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• Atmospheric pressure(atmos_pressure)
• soil_moisture_5
• base_time
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Left Air Temperature Thermocouple Incorrect

The left air temperature thermocouple was offscale, for unknown reasons, for 
1715 GMT for 15 minute, and 1730 GMT for 30 minute air temperature values.

The malfunction of the air temperature thermocouple results in incorrect Bowen 
ratio, sensible heat flux, and latent heat flux during the period indicated. 

The data values that are affected are:

5 minute:  tair_top, tair_bot

15 minute: tair_l

30 minute: tair_top, tair_bot, bowen, e, and h

• bowen_ratio
• temp_air_top
• Latent heat flux(latent_heat_flux)
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Battery Voltage Low - Fluxes Affected

The battery condition deteriorated over time so that the solar panel was not 
always able to keep the battery voltage high enough to produce correct home 
signal values.  The home 15 signal was too low much of the period above, 
with home 30 being low also occasionally.  The home signal qc checks should 
be consulted to determine which half hour values of sensible (h) and latent (e)
heat fluxes are incorrect; no other data values were affected.  The first 
occurrence of low home 15 signal appears to be 0630 GMT on 13 July 1996.  
Battery voltage did not drop low enough to cause any sensors to stop 
functioning.  The battery was replaced on 9 October 1996 at 2000 GMT, 
during annual calibration changeout of the entire EBBR unit (the mentor 
assumes that the battery was replaced - no instrument maintenance reports 
are available for that time).

• home_signal_15
• Latent heat flux(latent_heat_flux)
• home_signal_30
• Sensible heat flux(sensible_heat_flux)

Controlled burn at E12 on 3/20/97 and affected data

DQR No:                               Platforms:  sgpsirosE12
                                                  sgpebbrE12

Subject: Controlled burn at E12 on 3/20/97 and affected data

Date Submitted:  3/31/97
Submitted By: Mike Splitt             ___  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      _x_  Other _Site_Scientist_Team_
 
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at problems@arm.gov.

Platform/Measurement:
        What level data: (raw,a0,a1,b1,c1 etc):
             all levels
    What location was the data collected at: sgp E12
 
    Period of time in question
        Begin Date   3/20/97  Time   22:55    (GMT)
        End Date      *       Time     :      (GMT)

* The "end date" is not necessarily in need of definition. The EBBR data
  appears to be directly affected for a period of about one hour. The
  effect on the local shortwave albedo will be longer lasting and could 
  be said to "end" when the vegetative state recovers to being representative
  of similar areas.

 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 ___  incorrect                         ___  Only some data fields affected
 ___  wrong calibration
 _x_  others 
 
 Discussion of Problem:

This report is reflective of a change in environmental conditions thought
to be worth noting at E12, Pawhuska, and does not concern any issue of
substandard sensor performance. 

A contolled burn was conducted at the the Pawhuska Extened Facillity (E12)
by the Tallgrass Prairie Preserve. The Preserve director, Bob Hamilton,
contacted the ARM SGP Site prior to the activity which allowed Site Operations
to take precautionary steps. Danny Nelson reported the following activities by
Site Operations:

1)  Site Ops cut and removed all dried grass within the EF fence and
also to a 10' perimeter around the outside of the fence.  Final grass
height was 1-3".  This was done on Monday the 17th of March.

2)  Tallgrass Prairie Preserve personnel put down a 10' wet line around
our EF prior to the burn on the 20th, so the EF area was not burned.

3)  Site Ops had originally planned to deploy a field crew to inspect
the site on the day following the burn.  TPP director Bob Hamilton had
agreed to call us the morning of the burn, but didn't actually call us
until this morning; the day following the burn.  Due to the short
notification and prior commitment of personnel, Site Ops will not be
able to travel to the site until Monday or Tuesday of next week.

John Shatz was given the following information about the duration of
the burn:

>Bob Hamilton called and indicated that they did a control burn of the
>Tall Grass Prairie yesterday(3-20-97).  He indicated that the fire in
>our area lasted between 4:55 PM to 5:40 PM.  He also said that they
>plan to put this control burning on a two to three year cycle.

Affect on ARM Data:

Review of the EBBR temperature data (the sensor in the lower position)
shows a dramatic increase of temperature from 26 to 37 Celsius in a 
10 minute period.  The temperatures appear to have been affected for 
approximately 1 hour. 

Analysis of the broadband shortwave albedo during this period reveals
changes that appear to be related to the burn. The following is 
a listing of the daily average shortwave albedos (caluclated by running a linear
regression fit on the "curve" created by plotting the upwelling shortwave 
vs. the downwelling shortwave values from the E12 SIROS broadband instrumentation):

    Date        Broadband Shortwave Albedo
    ________   ____________________________

    3-14-97              .171
    3-15-97              .171
    3-16-97              .169
    3-17-97              .166
    3-18-97              .135
    3-19-97              .171
    3-20-97              .174
    3-21-97              .141
    3-22-97              .143
    3-23-97              .148
    3-24-97              .147

The grass cutting activity at the EF does not appear to be responsible
for the abledo change on 3-18; this is likely related to the drizzle
and overcast sky conditions in the area on that day. Note that the albedo
recovers to previous values by the next day. 

The burn occured late on the 20th, and it appears the albedo after the
burn sustained a more long-lasting decrease in value.  Examination of
both the upwelling and downwelling solar irradiance indicates that 
the albedo change was a resultant of the decrease in upwelling irradiance,
as the downwelling values were comparable to other sites.

• vapor_pressure_bottom
• North latitude(lat)
• East longitude(lon)
• Net radiation(net_radiation)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• vapor_pressure_top
• soil_heat_flow_5
• surface_soil_heat_flux_1
• soil_heat_flow_4
• soil_heat_flow_3
• surface_soil_heat_flux_4
• home_signal_30
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_2
• rh_bottom_fraction
• soil_heat_capacity_5
• soil_heat_flow_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• Altitude above mean sea level(alt)
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• energy_storage_change_3
• temp_reference
• energy_storage_change_4
• rh_top_fraction
• time_offset
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_2
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_3
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_4
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• Atmospheric pressure(atmos_pressure)
• soil_moisture_5
• base_time
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Wind Direction Sensor Malfunctions

For much of the period above, a malfunction in the E12 EBBR wind direction 
sensor (insect larvae shorting out the circuit board) caused incorrect 
values for 5 minute res_ws, wind_d, and sigma_wd, 15 minute mv_wind_d, and 
30 minute res_ws, wind_d, and sigma_wd.  Wind direction normally indicated 
north (near 0 or 360 degrees); there were some times during the period when 
wind directions looked good, but the lack of variation in direction and sigma 
implies that the data is suspect.  Therefore, it would be wise to flag all
of the values listed above during the entire time period as incorrect. 
The wind direction sensor (S/N 3081) was replaced with S/N 3042 at 1515 GMT 
on June 8, 1997.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - 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.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12- 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)

SGP/EBBR/E12 - 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 for this DQR after submittal

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected

The upper dome of the EBBR net radiometers was punctured.
After the puncture, water collected in the top and/or bottom dome.  The
water was removed and the dome was replaced during PM visits. 

 In some cases, the puncture and water resulted in incorrect data. 
Comparison with net radiation values from surrounding EBBR sites and the
SIRS is neccesary to determine if the EBBR net radiation data 
are correct or incorrect.

It is often difficult to tell from the data when the punctures occurred,
but they would have existed for no more than 2 weeks, since the domes
are checked during each two-weekly PM visit.

Incorrect net radiation data results in the latent heat flux and
sensible heat flux also being incorrect.

• Latent heat flux(latent_heat_flux)
• Sensible heat flux(sensible_heat_flux)
• Net radiation(net_radiation)

SGP/EBBR/E12 - AEM Failure and Replacement

The E12 AEM did not exchange for most of the period above, yielding small
negative home signals.  The AEM was replaced on 18 December by site
operations personnel.  All 30 minute e, h, and bowen data are incorrect for
the times when the home signal is incorrect, and the temperature, relative
humidity, and vapor pressures do not represent properly switched values.

• home_signal_15
• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• vapor_pressure_top
• Latent heat flux(latent_heat_flux)
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• home_signal_30
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - 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.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - Wind Direction Sensor Failure

The wind direction sensor failed, producing zero values.  
The cause is unknown.  Data values affected are below:

 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 mean(wdir_vec_mean)
• wdir_vec_std

SGP/EBBR/E12 - 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 indicated.

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• vapor_pressure_top
• Latent heat flux(latent_heat_flux)
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• temp_trh_top
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - 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)
• wdir_vec_std

SGP/EBBR/E12 - 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)

SGP/EBBR - EBBR E12 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,

• vapor_pressure_bottom
• North latitude(lat)
• East longitude(lon)
• Net radiation(net_radiation)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• vapor_pressure_top
• soil_heat_flow_5
• surface_soil_heat_flux_1
• soil_heat_flow_4
• soil_heat_flow_3
• surface_soil_heat_flux_4
• home_signal_30
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_2
• rh_bottom_fraction
• soil_heat_capacity_5
• soil_heat_flow_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• Altitude above mean sea level(alt)
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• energy_storage_change_3
• temp_reference
• energy_storage_change_4
• rh_top_fraction
• time_offset
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_2
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_3
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_4
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• Atmospheric pressure(atmos_pressure)
• soil_moisture_5
• base_time
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR - EBBR E12 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,

• vapor_pressure_bottom
• North latitude(lat)
• East longitude(lon)
• Net radiation(net_radiation)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• vapor_pressure_top
• soil_heat_flow_5
• surface_soil_heat_flux_1
• soil_heat_flow_4
• soil_heat_flow_3
• surface_soil_heat_flux_4
• home_signal_30
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_2
• rh_bottom_fraction
• soil_heat_capacity_5
• soil_heat_flow_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• Altitude above mean sea level(alt)
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• energy_storage_change_3
• temp_reference
• energy_storage_change_4
• rh_top_fraction
• time_offset
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_2
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_3
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_4
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• Atmospheric pressure(atmos_pressure)
• soil_moisture_5
• base_time
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Data Incorrect

Most of the data values for just this time (1630 GMT) for the 5, 15, and 30
minute periods are incorrect; this apparently was the result of PM activities.

• vapor_pressure_bottom
• North latitude(lat)
• East longitude(lon)
• Net radiation(net_radiation)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• vapor_pressure_top
• soil_heat_flow_5
• surface_soil_heat_flux_1
• soil_heat_flow_4
• soil_heat_flow_3
• surface_soil_heat_flux_4
• home_signal_30
• surface_soil_heat_flux_5
• surface_soil_heat_flux_2
• surface_soil_heat_flux_3
• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_flow_1
• energy_storage_change_1
• energy_storage_change_2
• rh_bottom_fraction
• soil_heat_capacity_5
• soil_heat_flow_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• Altitude above mean sea level(alt)
• temp_air_top
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• temp_trh_bottom
• temp_trh_top
• Wind speed vector mean(wspd_vec_mean)
• energy_storage_change_5
• temp_reference
• energy_storage_change_3
• energy_storage_change_4
• rh_top_fraction
• time_offset
• home_signal_15
• corr_soil_heat_flow_1
• bowen_ratio
• Soil temperature mean 5(soil_temp_5)
• corr_soil_heat_flow_2
• Soil temperature mean 4(soil_temp_4)
• corr_soil_heat_flow_3
• Soil temperature mean 3(soil_temp_3)
• corr_soil_heat_flow_4
• Wind direction vector mean(wdir_vec_mean)
• corr_soil_heat_flow_5
• Soil temperature mean 2(soil_temp_2)
• soil_moisture_1
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• Atmospheric pressure(atmos_pressure)
• soil_moisture_5
• base_time
• soil_moisture_4
• soil_moisture_3
• soil_moisture_2
• wdir_vec_std
• temp_air_bottom
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - Temperature, RH, and Vapor Pressure Data Incorrect

The right aspirator housing fell off of the AEM around 1345 GMT, by looking
at the data.  The housing was put back into place later in the day during 
a PM visit.  The following values were affected:

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

• bowen_ratio
• temp_air_top
• rh_bottom_fraction
• Latent heat flux(latent_heat_flux)
• vapor_pressure_top
• vapor_pressure_bottom
• temp_air_bottom
• rh_top_fraction
• temp_trh_bottom
• Sensible heat flux(sensible_heat_flux)
• temp_trh_top

SGP/EBBR/E12 - All Temperature Measurements Incorrect

Failure of the multiplexer connection for the reference temperature 
thermocouple in the control box or a problem with the Campbell CR10
bridge circuitry caused all air and soil temperature measurements
to be incorrect. Therefore, the computed 30 minute bowen, e, and h were 
also incorrect.

• bowen_ratio
• temp_air_top
• Soil temperature mean 5(soil_temp_5)
• Soil temperature mean 4(soil_temp_4)
• temp_reference
• Soil temperature mean 3(soil_temp_3)
• Soil temperature mean 2(soil_temp_2)
• Soil temperature mean 1(soil_temp_1)
• Latent heat flux(latent_heat_flux)
• temp_air_bottom
• temp_trh_bottom
• temp_trh_top
• Sensible heat flux(sensible_heat_flux)

SGP/EBBR/E12 - RH top Data Zero

The one data value hum_top was incorrect in the 30 minute data.  5 and 15
minute data were not affected, and the 30 minute flux data was not affected.
The data value may have been lost in remote data retrieval, resulting in
a zero value instead.

• rh_top_fraction