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 - 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)