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_3
• soil_heat_capacity_5
• soil_heat_capacity_4

• soil_heat_capacity_4
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_5
• soil_heat_capacity_1

• soil_heat_capacity_3
• soil_heat_capacity_5
• soil_heat_capacity_1
• soil_heat_capacity_4
• soil_heat_capacity_2

• soil_heat_capacity_1
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5

• soil_heat_capacity_3
• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_2
• soil_heat_capacity_1

• soil_heat_capacity_3
• soil_heat_capacity_5
• soil_heat_capacity_4
• soil_heat_capacity_2
• soil_heat_capacity_1

• soil_heat_capacity_5
• soil_heat_capacity_4
• soil_heat_capacity_2
• soil_heat_capacity_3
• soil_heat_capacity_1

• soil_heat_capacity_2
• soil_heat_capacity_4
• soil_heat_capacity_3
• soil_heat_capacity_1
• soil_heat_capacity_5

• soil_heat_capacity_4
• soil_heat_capacity_5
• soil_heat_capacity_3
• soil_heat_capacity_1
• soil_heat_capacity_2

• soil_heat_capacity_2
• soil_heat_capacity_1
• soil_heat_capacity_5
• soil_heat_capacity_3
• soil_heat_capacity_4

• soil_heat_capacity_3
• soil_heat_capacity_5
• soil_heat_capacity_2
• soil_heat_capacity_4
• soil_heat_capacity_1

• soil_heat_capacity_5
• soil_heat_capacity_4
• soil_heat_capacity_1
• soil_heat_capacity_3
• soil_heat_capacity_2

• soil_heat_capacity_5
• soil_heat_capacity_1
• soil_heat_capacity_3
• soil_heat_capacity_2
• soil_heat_capacity_4

SGP/EBBR/E20 -  6 Month Checks

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

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

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

• Temperature of the top humidity chamber(thum_top)
• top vapor pressure(vp_top)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom vapor pressure(vp_bot)
• top air temperature(tair_top)
• bottom air temperature(tair_bot)
• Top humidity(hum_top)
• Bottom humidity(hum_bot)

• Bottom humidity(hum_bot)
• Temperature of the top humidity chamber(thum_top)
• bottom vapor pressure(vp_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• h(h)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• Top humidity(hum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)
• latent heat flux(e)
• bottom air temperature(tair_bot)

• Temperature of right humidity sensor chamber(rr_thum_r)
• Right air temperature(tair_r)
• Left air temperature(tair_l)
• Left relative humidity(mv_hum_l)
• Right relative humidity(mv_hum_r)
• Temperature of left humidity sensor chamber(rr_thum_l)

SGP/EBBR/E20 - Fuse Blown in AEM

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

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

• temp_air_left
• temp_air_right

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

SGP/EBBR/E20 - Reprocess: Soil Temperature Probe #1 Measurements Spiked

The soil temperature #1 measurement spiked quite high at times.

This affected a number of measurements that are dependent on the 
soil temperature measurements.

• surface_soil_heat_flux_avg
• surface_soil_heat_flux_1
• latent_heat_flux
• sensible_heat_flux
• soil_temp_1
• energy_storage_change_1

• soil_temp_1_rr

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

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

• latent_heat_flux
• sensible_heat_flux
• net_radiation

• net radiation(q)

• net_radiation_mv

• net radiation(q)
• latent heat flux(e)
• h(h)

• Net radiation(mv_q)

SGP/EBBR/E20 - 6 Month Checks

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

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

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

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

SGP/EBBR/E20 - Wind Direction Incorrect

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

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

• wdir_vec_mean_mv

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

SGP/EBBR/E20 - Pressure Sensor Data Incorrect

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

Replacement of the pressure sensor solved the problem.

• Barometric Pressure(atmos_pressure)

• atmos_pressure_mv

• Barometric Pressure(atmos_pressure)

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

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

• wspd_vec_mean
• wspd_arith_mean

• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

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

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

The wind speed and residual wind speed measurements are incorrect.

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

• wspd_vec_mean
• wspd_arith_mean

• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

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

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

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

SGP/EBBR/E20 - Left Air Temperature Incorrect

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

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

• temp_air_bottom
• latent_heat_flux
• sensible_heat_flux
• temp_air_top
• bowen_ratio

• temp_air_left

• temp_air_bottom
• temp_air_top

• Aerodynamic Latent heat flux(ale)
• Aerodynamic Sensible heat flux(ah)
• top air temperature(tair_top)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• bottom air temperature(tair_bot)
• Best estimate Sensible heat flux(hcomb)
• Best estimate Latent heat flux(ecomb)
• h(h)
• latent heat flux(e)

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

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

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

• wdir_vec_mean_mv

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

SGP/EBBR/E20 - AEM Failure

The AEM hung inbetween positions; home signals were zero.

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

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

• temp_air_left
• temp_air_right

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

SGP/EBBR/E20 - Soil Heat Flow #3 and Soil Temperature #3 Incorrect

• corr_soil_heat_flow_3
• surface_soil_heat_flux_avg
• surface_soil_heat_flux_3
• latent_heat_flux
• sensible_heat_flux
• soil_temp_3
• energy_storage_change_3
• soil_heat_flow_3

• soil_temp_3_rr
• soil_heat_flow_3_mv

SGP/EBBR/E20  - All Soil Measurements Incorrect

All soil measurements were incorrect during the replacement of soil heat flow #3 and soil 
temperature #3.

• corr_soil_heat_flow_3
• surface_soil_heat_flux_3
• soil_heat_flow_2
• soil_heat_flow_1
• surface_soil_heat_flux_4
• soil_heat_capacity_2
• soil_heat_capacity_1
• corr_soil_heat_flow_2
• soil_moisture_3
• corr_soil_heat_flow_4
• soil_moisture_5
• soil_moisture_1
• surface_soil_heat_flux_avg
• soil_moisture_4
• latent_heat_flux
• surface_soil_heat_flux_2
• soil_heat_capacity_5
• energy_storage_change_5
• soil_moisture_2
• soil_temp_1
• corr_soil_heat_flow_5
• surface_soil_heat_flux_1
• soil_temp_4
• soil_temp_3
• energy_storage_change_3
• soil_temp_2
• corr_soil_heat_flow_1
• sensible_heat_flux
• soil_heat_flow_5
• soil_temp_5
• energy_storage_change_1
• energy_storage_change_2
• soil_heat_flow_4
• soil_heat_capacity_3
• energy_storage_change_4
• surface_soil_heat_flux_5
• soil_heat_capacity_4
• soil_heat_flow_3

• soil_temp_5_rr
• soil_moisture_2_rr
• soil_moisture_5_rr
• soil_temp_3_rr
• soil_moisture_1_rr
• soil_heat_flow_1_mv
• soil_moisture_3_rr
• soil_heat_flow_4_mv
• soil_heat_flow_3_mv
• soil_heat_flow_2_mv
• soil_temp_2_rr
• soil_temp_1_rr
• soil_moisture_4_rr
• soil_heat_flow_5_mv
• soil_temp_4_rr

SGP/EBBR/E20 - 6 Month Checks

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

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

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

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

SGP/EBBR/E20 - Soil Moisture #4 and Soil Temperature #4 Incorrect

Failures of a multiplexer channel and a J-panel channel caused soil temperature #4 and 
soil moisture #4 to spike and drift at times.  Replacement of the failed equipment solved 
the problem.

• surface_soil_heat_flux_avg
• energy_storage_change_4
• soil_moisture_4
• latent_heat_flux
• soil_temp_4
• soil_heat_capacity_4
• corr_soil_heat_flow_4
• sensible_heat_flux
• surface_soil_heat_flux_4

• soil_temp_4_rr
• soil_moisture_4_rr

SGP/EBBR/E20 - Soil Heat Flow #4 Incorrect

Soil Heat Flow #4 was missing or offscale and therefore incorrect during the stated 
period.

• surface_soil_heat_flux_avg
• latent_heat_flux
• corr_soil_heat_flow_4
• soil_heat_flow_4
• sensible_heat_flux
• surface_soil_heat_flux_4

• soil_heat_flow_4_mv

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

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

The wind speed and residual wind speed measurements are incorrect.

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

• wspd_vec_mean
• wspd_arith_mean

• wspd_arith_mean

• wspd_vec_mean
• wspd_arith_mean

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

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

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

• wdir_vec_mean_mv

• wspd_vec_mean
• wdir_vec_std
• wdir_vec_mean

SGP/EBBR/E20 - Improved EBBR CR10 Program

Effective 20050330.1900, the EBBR.E20 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 20050330, 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 sgp30ebbrE20.b1 data
stream.  The earlier version of the CR10 program was also used on previous
EBBR datastream names (e.g. sgp30ebbrE20.a1).

• surface_soil_heat_flux_avg
• latent_heat_flux
• sensible_heat_flux

SGP/EBBR/E20 - metadata corrections

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

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

• base time(base_time)

• base time(base_time)

• base time(base_time)