SGP/EBBR/E19 - Low Battery Voltage Caused Incorrect Data

Battery voltage less than 10.5 V caused much data to be questionable or incorrect.

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

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

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

SGP/EBBR/E19  - 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, lower, 1-min avg(wspd_arith_mean)

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

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

SGP/EBBR/E19 - Reprocess: Incorrect Net Rad Calibration Coefficient

The net radiometer coefficient installed on 2/5/04 for nighttime (negative voltage 
calibration) was incorrect.

Negative net radiations during the subject period can be multiplied by
0.9419 to get corrected net radiation measurements.  The sensible (H)
and latent heat (LE) fluxes (which are very small at night anyway) can
be recalculated using the following equations (where B is Bowen ratio,
Rn is corrected net radiation, and G is soil heat flow):

LE = -(Rn + G)/(B + 1)

H = -(Rn + G + LE)

• Radiation, net(net_radiation)

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

• Corrected sensible heat flux(h)
• Heat flux, latent, aerodynamic(ale)
• Heat flux, sensible, aerodynamic(ah)
• Heat flux, latent(e)
• Radiation, net(q)

SGP/EBBR/E19 - AEM Hung Inbetween Home Positions

The AEM hung inbetween home positions, producing a home signal of zero.

Sensible and latent heat fluxes during this period are incorrect.

• temp_air_left
• temp_air_right

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

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

SGP/EBBR/E19 - 6 Month Checks

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

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

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

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

SGP/EBBR/E19  - 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, lower, 1-min avg(wspd_arith_mean)

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

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

SGP/EBBR/E19  - 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_std
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Wind speed vector mean(wspd_vec_mean)

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

SGP/EBBR/E19  - Wind Speed Constant

Wind Speed was constant at 5 m/s during this period; the reason is unknown.

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

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

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

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

SGP/EBBR/E19 - Reprocess: Negative Net Rad calibrations

The calibration for negative net radiation was incorrectly entered in the datalogger 
program.

• Radiation, net(net_radiation)

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

SGP/EBBR/E19 - Net Radiation Incorrect - Cable Chewed by Rodents

The net radiation measurement was incorrect after the net radiometer cable was chewed by 
rodents.  Sensible and latent heat fluxes were therefore incorrect.

• net_radiation_mv

• Radiation, net(net_radiation)

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

SGP/EBBR/E19 - Improved EBBR CR10 Program

Effective 20050331.1600, the EBBR.E19 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 sgp30ebbrE19.b1 data
stream.  The earlier version of the CR10 program was also used on previous
EBBR datastream names (e.g. sgp30ebbrE19.a1).

• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)

SGP/EBBR/E19 - 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.

• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• Average soil heat flow at the surface(surface_soil_heat_flux_avg)
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)

SGP/EBBR/E19 - metadata corrections

On 20050723, a series of metadata corrections and additions were completed.  These 
metadata changes apply to all EBBR.E19 data collected by ARM back to the beginning of the data 
set in May 1997. 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

• base_time

• base_time

SGP/EBBR/E19 - Net Radiation, Sensible and Latent Heat Fluxes Incorrect

The net radiometer cable was chewed by an animal.  Net Radiation, Sensible Heat Flux, and 
Latent Heat Flux were incorrect during the stated periods.

• net_radiation_mv

• Radiation, net(net_radiation)

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

SGP/EBBR/E19 - Incorrect Sensible and Latent Heat Fluxes

The gradient measurements and latent and sensible heat fluxes were incorrect because the 
AEM was not exchanging. 

The problem was fixed by replacing the AEM.

• temp_air_left
• temp_air_right

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

• surface_soil_heat_flux_1
• temp_air_bottom
• Heat flux, latent, at 1.5-m height, 30-min intervals(latent_heat_flux)
• temp_trh_top
• temp_air_top
• rh_top_fraction
• vapor_pressure_top
• temp_trh_bottom
• rh_bottom_fraction
• bowen_ratio
• vapor_pressure_bottom
• Heat flux, sensible, at 1.5-m height, 30-min intervals(sensible_heat_flux)

SGP/EBBR/E19 - Sensible and Latent Heat Fluxes Incorrect

The sensible and latent heat fluxes were incorrect when the top and bottom air 
temperatures were incorrect.

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

SGP/EBBR/E19 - Sensible and latent heat flux and net radiation incorrect

Net radiation was too large, resulting in sensible and latent heat fluxes being too large. 
 The cause of the problem is unknown.

• net_radiation_mv

• Radiation, net(net_radiation)

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

SGP/EBBR/E19 - Wind Speed Incorrect

Wind Speed was frozen stopped by ice and was incorrect during this period.

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

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

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