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/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
• rh_right_mv
• temp_trh_right_rr
• temp_air_left
• temp_air_right

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

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

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

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

SGP/EBBR/E13  - Water In Net Radiometer; Surface Fluxes are 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(mv_q)

• latent_heat_flux
• net_radiation
• sensible_heat_flux

• net radiation(q)

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

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(mv_q)

• latent_heat_flux
• net_radiation
• sensible_heat_flux

• net radiation(q)

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

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
• rh_right_mv
• temp_trh_right_rr
• temp_air_left
• temp_air_right

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

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

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_arith_mean
• wspd_vec_mean

• wspd_arith_mean
• wspd_vec_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

• latent_heat_flux
• net_radiation
• sensible_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_arith_mean
• wspd_vec_mean

• wspd_arith_mean
• wspd_vec_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_std
• wspd_vec_mean
• wdir_vec_mean

• wdir_vec_mean
• wspd_vec_mean
• wdir_vec_std

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_left
• temp_air_right

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

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

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

• latent_heat_flux
• net_radiation
• sensible_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_left
• temp_air_right

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

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

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
• rh_right_mv
• temp_trh_right_rr
• temp_air_left
• temp_air_right

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

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

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_arith_mean
• wspd_vec_mean

• wspd_arith_mean
• wspd_vec_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_std
• wspd_vec_mean
• wdir_vec_mean

• wdir_vec_mean
• wspd_vec_mean
• wdir_vec_std

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

• latent_heat_flux
• net_radiation
• sensible_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_left
• temp_air_right

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

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

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).

• latent_heat_flux
• surface_soil_heat_flux_avg
• sensible_heat_flux

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_left
• temp_air_right

• temp_air_bottom

• bowen_ratio
• latent_heat_flux
• sensible_heat_flux
• temp_air_bottom

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.

• latent_heat_flux
• surface_soil_heat_flux_avg
• sensible_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)