SGP/EBBR/E13  - 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.

• net_radiation_mv

• net_radiation

• sensible_heat_flux
• net_radiation
• latent_heat_flux

SGP/EBBR/E13 - 6 Month Checks

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

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

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

• sensible_heat_flux
• vapor_pressure_top
• latent_heat_flux
• temp_air_bottom
• temp_air_top
• bowen_ratio
• temp_trh_top
• rh_bottom_fraction
• vapor_pressure_bottom
• temp_trh_bottom
• rh_top_fraction

SGP/EBBR/E13  - 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.

• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

SGP/EBBR/E13  - Net Radiometer Iced Over During Storm

The net radiometer was covered with ice from a storm.  Net radiation values are incorrect, 
and are sometimes even negative during the daytime.  Sensible and latent heat fluxes are 
therefore incorrect.

• net_radiation_mv

• net_radiation

• sensible_heat_flux
• net_radiation
• latent_heat_flux

SGP/EBBR/E13  - 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.

• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

SGP/EBBR/E13  - 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.

• wdir_vec_mean
• wdir_vec_std
• wspd_vec_mean

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

SGP/EBBR/E13 - Automatic Exchange Mechanism Failure

The AEM was stuck in the home_15 position or reported near zero
home signals during much of the indicated period.

The Bowen ratio and latent and sensible heat fluxes were incorrect 
when the AEM was not operating properly; the periods of incorrect
data can be determined from the home signal values.

On 7/14/04 the AEM was replaced.

• temp_air_right
• temp_air_left

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

• sensible_heat_flux
• bowen_ratio
• temp_trh_top
• rh_bottom_fraction
• vapor_pressure_top
• latent_heat_flux
• vapor_pressure_bottom
• temp_air_bottom
• temp_trh_bottom
• rh_top_fraction
• temp_air_top

SGP/EBBR/E13 - Net Radiation Incorrect, Fluxes Incorrect

Rain entered the net radiometer through a crack in the upper dome and
settled in the bottom dome.  This caused too large net radiation measurements
during the following daylight hours, until the domes were replaced and dried out the same 
day.

• net_radiation_mv

• net_radiation

• sensible_heat_flux
• net_radiation
• latent_heat_flux

SGP/EBBR/E13 - AEM Failure, Fluxes Incorrect

The AEM failed.  Sensible and latent heat fluxes were incorrect, as well as gradient 
measurements.

• temp_air_right
• temp_air_left

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

• sensible_heat_flux
• bowen_ratio
• temp_trh_top
• rh_bottom_fraction
• vapor_pressure_top
• latent_heat_flux
• vapor_pressure_bottom
• temp_air_bottom
• temp_trh_bottom
• rh_top_fraction
• temp_air_top

SGP/EBBR/E13 - 6 Month Checks

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

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

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

• sensible_heat_flux
• vapor_pressure_top
• latent_heat_flux
• temp_air_bottom
• temp_air_top
• bowen_ratio
• temp_trh_top
• rh_bottom_fraction
• vapor_pressure_bottom
• temp_trh_bottom
• rh_top_fraction

SGP/EBBR/E13  - 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.

• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

SGP/EBBR/E13  - 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.

• wdir_vec_mean_mv

• wdir_vec_mean
• wdir_vec_std
• wspd_vec_mean

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

SGP/EBBR/E13 - Net Radiometer Tilted Half Degree West

The net radiation daily peak on sunny days occured 1/2 hour after the net radiation peak 
at E2, E9, and the SIRS because the sensor was tipped to the west about 1/2 degree.

• net_radiation_mv

• net_radiation

• sensible_heat_flux
• net_radiation
• latent_heat_flux

SGP/EBBR/E13 - Sensible and Latent Heat Fluxes Incorrect (AEM failure)

The AEM was stuck in the home 30 position most of this period.

Therefore, the sensible and latent heat fluxes are incorrect during most of this period.

• temp_air_right
• temp_air_left

• temp_air_top
• temp_air_bottom
• temp_trh_bottom
• vapor_pressure_top
• temp_trh_top
• vapor_pressure_bottom

• sensible_heat_flux
• bowen_ratio
• temp_trh_top
• rh_bottom_fraction
• vapor_pressure_top
• latent_heat_flux
• vapor_pressure_bottom
• temp_air_bottom
• temp_trh_bottom
• rh_top_fraction
• temp_air_top

SGP/EBBR/E13 - Improved EBBR CR10 Program

Effective 20050331.2100, the EBBR.E13 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 20050331, 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 sgp30ebbrE13.b1 data stream.  The 
earlier version of the CR10 program was also used on previous EBBR datastream names (e.g. 
sgp30ebbrE13.a1).

• sensible_heat_flux
• surface_soil_heat_flux_avg
• latent_heat_flux

SGP/EBBR/E13 - Fluxes Incorrect

The AEM has not been reaching the home_30 position fully a few times a day on most days, 
resulting in zero home_30 measurements.

The sensible and latent heat fluxes are incorrect when the home_30 measurement is near 
zero.

• temp_air_right
• temp_trh_right_rr
• temp_trh_left_rr
• temp_air_left

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

• sensible_heat_flux
• bowen_ratio
• temp_trh_top
• rh_bottom_fraction
• vapor_pressure_top
• latent_heat_flux
• vapor_pressure_bottom
• temp_air_bottom
• temp_trh_bottom
• rh_top_fraction
• temp_air_top

SGP/EBBR/E13 - Loose connections

The tair_bot spiked around midday, as if it is temperature related, and may have indicated 
a loose connection.

The sensible and latyent heat fluxes and Bowen ratio were incorrect when this condition 
occurred.

• temp_air_right
• temp_air_left

• temp_air_bottom

• sensible_heat_flux
• temp_air_bottom
• bowen_ratio
• latent_heat_flux

SGP/EBBR/E13 - 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.

• sensible_heat_flux
• surface_soil_heat_flux_avg
• latent_heat_flux

SGP/EBBR/E13 - metadata corrections

On 20050723, a series of metadata corrections and additions were completed.  These 
metadata changes apply to all EBBR.E13 data collected by ARM back to the installation of the 
instrument in September 1992.  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 systems
3) Correction of soil type
4) Correction of soil moisture units (from "by volume" to "gravimetric")

• base time(base_time)

• base time(base_time)

• base time(base_time)

SGP/EBBR/E13 - Wind Speed Sensor Frozen

The wind speed sensor was frozen to a stopped posiiton; wind speed data is incorrect.

• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

SGP/EBBR/E13 - Missing Data

The Data was missing during these three periods for various reasons.

• home_signal
• Dummy altitude for Zeb(alt)
• soil_temp_4_rr
• temp_air_right
• soil_heat_flow_1_mv
• soil_temp_1_rr
• soil_heat_flow_4_mv
• lon(lon)
• atmos_pressure_mv
• temp_reference_rr
• soil_moisture_1_rr
• wdir_vec_mean_mv
• rh_left_mv
• soil_temp_5_rr
• soil_moisture_4_rr
• temp_air_left
• base time(base_time)
• wspd_arith_mean
• soil_moisture_3_rr
• net_radiation_mv
• lat(lat)
• soil_heat_flow_2_mv
• temp_trh_left_rr
• soil_moisture_5_rr
• soil_heat_flow_3_mv
• soil_temp_3_rr
• Time offset of tweaks from base_time(time_offset)
• soil_temp_2_rr
• soil_moisture_2_rr
• temp_trh_right_rr
• soil_heat_flow_5_mv
• rh_right_mv
• battery_voltage

• temp_air_top
• rh_bottom_fraction
• vapor_pressure_top
• wdir_vec_std
• Barometric Pressure(atmos_pressure)
• wdir_vec_mean
• Time offset of tweaks from base_time(time_offset)
• temp_trh_bottom
• temp_reference
• lon(lon)
• base time(base_time)
• temp_trh_top
• wspd_vec_mean
• lat(lat)
• Dummy altitude for Zeb(alt)
• net_radiation
• rh_top_fraction
• time(time)
• vapor_pressure_bottom
• home_signal
• temp_air_bottom
• wspd_arith_mean

• wspd_vec_mean
• sensible_heat_flux
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• energy_storage_change_4
• energy_storage_change_5
• corr_soil_heat_flow_5
• corr_soil_heat_flow_2
• corr_soil_heat_flow_1
• latent_heat_flux
• wdir_vec_mean
• soil_heat_flow_1
• soil_moisture_1
• soil_heat_flow_3
• soil_moisture_2
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• energy_storage_change_1
• soil_moisture_5
• energy_storage_change_3
• soil_moisture_3
• energy_storage_change_2
• soil_moisture_4
• vapor_pressure_top
• home_signal_15
• wspd_arith_mean
• Dummy altitude for Zeb(alt)
• net_radiation
• temp_trh_bottom
• home_signal_30
• temp_air_bottom
• surface_soil_heat_flux_5
• surface_soil_heat_flux_avg
• temp_air_top
• lon(lon)
• temp_trh_top
• base time(base_time)
• Time offset of tweaks from base_time(time_offset)
• Barometric Pressure(atmos_pressure)
• temp_reference
• soil_heat_capacity_1
• soil_heat_capacity_5
• soil_temp_2
• soil_temp_1
• soil_heat_capacity_4
• soil_heat_capacity_3
• soil_heat_capacity_2
• soil_temp_5
• soil_temp_4
• soil_temp_3
• wdir_vec_std
• bowen_ratio
• surface_soil_heat_flux_3
• surface_soil_heat_flux_4
• surface_soil_heat_flux_1
• surface_soil_heat_flux_2
• rh_bottom_fraction
• lat(lat)
• vapor_pressure_bottom
• rh_top_fraction

SGP/EBBR/E13 - Flux and Gradient Measurements Incorrect

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

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

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

• sensible_heat_flux
• vapor_pressure_top
• latent_heat_flux
• temp_air_bottom
• temp_air_top
• bowen_ratio
• temp_trh_top
• rh_bottom_fraction
• vapor_pressure_bottom
• temp_trh_bottom
• rh_top_fraction

SGP/EBBR/E13 - Net Radiation and Fluxes Suspect

The net radiometer had water in it, making the net radiation and flux measurements 
suspect; the latter do not appear to be incorrect, but should be considered as suspect anyway.

• net_radiation_mv

• net_radiation

• sensible_heat_flux
• net_radiation
• latent_heat_flux

SGP/EBBR/E13 - Left Air Temperature Incorrect - Fluxes Affected

The left air temperature was incorrect, thus the Bowen ratio and sensible and latent heat 
fluxes were incorrect also.

• temp_air_left

• temp_air_top
• temp_air_bottom

• sensible_heat_flux
• temp_air_bottom
• bowen_ratio
• temp_air_top
• latent_heat_flux

SGP/EBBR/E13 - Fluxes Incorrect, AEM Problems

The AEM did not function properly, thus sensible and latent heat fluxes were incorrect.

• temp_air_right
• temp_air_left

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

• sensible_heat_flux
• bowen_ratio
• temp_trh_top
• rh_bottom_fraction
• vapor_pressure_top
• latent_heat_flux
• vapor_pressure_bottom
• temp_air_bottom
• temp_trh_bottom
• rh_top_fraction
• temp_air_top

SGP/EBBR/E13 - Sensible and Latent Heat Fluxes Incorrect When Pressure Offscale

There were several half hours during this period when the pressure went offscale or at 
least to a high value, causing the sensible and latent heat fluxes to be incorrect.

• atmos_pressure_mv

• Barometric Pressure(atmos_pressure)

• sensible_heat_flux
• Barometric Pressure(atmos_pressure)
• latent_heat_flux

SGP/EBBR/E13 - Soil Heat Flow #3 Large Negative

During this period Soil Heat Flow #3 was sometimes incorrect (large negative); during 
those times, sensible and latent heat fluxes and average soil heat flux were sometimes (but 
not always incorrect).

• soil_heat_flow_3_mv

• soil_heat_flow_3
• sensible_heat_flux
• surface_soil_heat_flux_3
• corr_soil_heat_flow_3
• surface_soil_heat_flux_avg
• latent_heat_flux

SGP/EBBR/E13 - Pressure and Sensible and Latent Heat Fluxes Incorrect

During spikes in pressure upwards or downwards the sensible and latent heat fluxes were 
incorrect.

• atmos_pressure_mv

• Barometric Pressure(atmos_pressure)

• sensible_heat_flux
• Barometric Pressure(atmos_pressure)
• latent_heat_flux

SGP/EBBR/E13 - Most Measurements Incorrect When Battery Voltage Too low

Most measurements were incorrect during this period because the battery voltage was below 
10.5 volts.

• home_signal
• soil_temp_4_rr
• temp_air_right
• soil_heat_flow_1_mv
• soil_temp_1_rr
• soil_heat_flow_4_mv
• atmos_pressure_mv
• temp_reference_rr
• soil_moisture_1_rr
• wdir_vec_mean_mv
• rh_left_mv
• soil_temp_5_rr
• soil_moisture_4_rr
• temp_air_left
• wspd_arith_mean
• soil_moisture_3_rr
• net_radiation_mv
• soil_heat_flow_2_mv
• temp_trh_left_rr
• soil_moisture_5_rr
• soil_heat_flow_3_mv
• soil_temp_3_rr
• soil_temp_2_rr
• soil_moisture_2_rr
• temp_trh_right_rr
• soil_heat_flow_5_mv
• rh_right_mv

• temp_air_top
• rh_bottom_fraction
• vapor_pressure_top
• wdir_vec_std
• Barometric Pressure(atmos_pressure)
• wdir_vec_mean
• temp_trh_bottom
• temp_reference
• temp_trh_top
• wspd_vec_mean
• net_radiation
• rh_top_fraction
• vapor_pressure_bottom
• home_signal
• temp_air_bottom
• wspd_arith_mean

• wspd_vec_mean
• sensible_heat_flux
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• energy_storage_change_4
• corr_soil_heat_flow_5
• energy_storage_change_5
• corr_soil_heat_flow_2
• latent_heat_flux
• corr_soil_heat_flow_1
• wdir_vec_mean
• soil_heat_flow_1
• soil_moisture_1
• soil_heat_flow_3
• soil_moisture_2
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• soil_moisture_5
• energy_storage_change_1
• soil_moisture_3
• energy_storage_change_3
• soil_moisture_4
• energy_storage_change_2
• vapor_pressure_top
• home_signal_15
• wspd_arith_mean
• net_radiation
• temp_trh_bottom
• home_signal_30
• temp_air_bottom
• surface_soil_heat_flux_5
• surface_soil_heat_flux_avg
• temp_air_top
• temp_trh_top
• Barometric Pressure(atmos_pressure)
• temp_reference
• soil_heat_capacity_1
• soil_temp_2
• soil_heat_capacity_5
• soil_temp_1
• soil_heat_capacity_4
• soil_heat_capacity_3
• soil_heat_capacity_2
• soil_temp_5
• soil_temp_4
• soil_temp_3
• wdir_vec_std
• bowen_ratio
• surface_soil_heat_flux_3
• surface_soil_heat_flux_4
• surface_soil_heat_flux_1
• surface_soil_heat_flux_2
• rh_bottom_fraction
• vapor_pressure_bottom
• rh_top_fraction

SGP/EBBR/E13 - Battery failure

Data was missing entirely on parts of 10/22 and 10/23.

• home_signal
• soil_temp_4_rr
• temp_air_right
• soil_heat_flow_1_mv
• soil_temp_1_rr
• soil_heat_flow_4_mv
• atmos_pressure_mv
• temp_reference_rr
• soil_moisture_1_rr
• wdir_vec_mean_mv
• rh_left_mv
• soil_temp_5_rr
• soil_moisture_4_rr
• temp_air_left
• wspd_arith_mean
• soil_moisture_3_rr
• net_radiation_mv
• soil_heat_flow_2_mv
• temp_trh_left_rr
• soil_moisture_5_rr
• soil_heat_flow_3_mv
• soil_temp_3_rr
• soil_temp_2_rr
• soil_moisture_2_rr
• temp_trh_right_rr
• soil_heat_flow_5_mv
• rh_right_mv

• temp_air_top
• rh_bottom_fraction
• vapor_pressure_top
• wdir_vec_std
• Barometric Pressure(atmos_pressure)
• wdir_vec_mean
• temp_trh_bottom
• temp_reference
• temp_trh_top
• wspd_vec_mean
• net_radiation
• rh_top_fraction
• vapor_pressure_bottom
• temp_air_bottom
• wspd_arith_mean

• wspd_vec_mean
• sensible_heat_flux
• corr_soil_heat_flow_4
• corr_soil_heat_flow_3
• energy_storage_change_4
• corr_soil_heat_flow_5
• energy_storage_change_5
• corr_soil_heat_flow_2
• latent_heat_flux
• corr_soil_heat_flow_1
• wdir_vec_mean
• soil_heat_flow_1
• soil_moisture_1
• soil_heat_flow_3
• soil_moisture_2
• soil_heat_flow_2
• soil_heat_flow_5
• soil_heat_flow_4
• soil_moisture_5
• energy_storage_change_1
• soil_moisture_3
• energy_storage_change_3
• soil_moisture_4
• energy_storage_change_2
• vapor_pressure_top
• home_signal_15
• wspd_arith_mean
• net_radiation
• temp_trh_bottom
• home_signal_30
• temp_air_bottom
• surface_soil_heat_flux_5
• surface_soil_heat_flux_avg
• temp_air_top
• temp_trh_top
• Barometric Pressure(atmos_pressure)
• temp_reference
• soil_heat_capacity_1
• soil_temp_2
• soil_heat_capacity_5
• soil_temp_1
• soil_heat_capacity_4
• soil_heat_capacity_3
• soil_heat_capacity_2
• soil_temp_5
• soil_temp_4
• soil_temp_3
• wdir_vec_std
• bowen_ratio
• surface_soil_heat_flux_3
• surface_soil_heat_flux_4
• surface_soil_heat_flux_1
• surface_soil_heat_flux_2
• rh_bottom_fraction
• vapor_pressure_bottom
• rh_top_fraction

SGP/EBBR/E13 - Radiometer dome broken

The top net radiometer dome was broken, yielding net radiation, sensible heat flux and 
latent heat flux that were too low.

The BEFLUX (SIRS) net radiation can be used as a replacement for the EBBR net radiation.

To correct the sensible and latent heat fluxes, determine the ratio of SIRS net radiation 
to EBBR net radiation for each daylight half hour and multiply that ratio times H and LE 
to obtain approximate corrected flux values.

• net_radiation_mv

• net_radiation

• sensible_heat_flux
• net_radiation
• latent_heat_flux

SGP/EBBR/E13 - Wind direction failure

The EBBR wind direction was stuck at 135 degrees; this reading indicates a failure of the 
sensor electronics.

• wdir_vec_mean_mv

• wdir_vec_mean
• wdir_vec_std
• wspd_vec_mean

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

SGP/EBBR/E13 - Wind Speed Incorrect

The wind speed sensor was stopped by freezing rain.

• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean