SGP/EBBR/E4 - 6 Month Checks

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

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

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

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

SGP/EBBR/E4  - 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_vec_mean
• wspd_arith_mean

• wspd_arith_mean

SGP/EBBR/E4  - 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_std
• wspd_vec_mean
• wdir_vec_mean

• wdir_vec_std
• wspd_vec_mean
• wdir_vec_mean

• wdir_vec_mean_mv

SGP/EBBR/E4  - 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_std
• wspd_vec_mean
• wdir_vec_mean

• wdir_vec_mean_mv

SGP/EBBR/E4  - 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_vec_mean
• wspd_arith_mean

• wspd_arith_mean

SGP/EBBR/E4 - Wind Speed and Direction Frozen by Ice Storm

The wind speed and direction sensors were frozen during an ice storm on 2/24/05.

• wdir_vec_std
• wspd_arith_mean
• wspd_vec_mean
• wdir_vec_mean

• wdir_vec_std
• wspd_vec_mean
• wspd_arith_mean
• wdir_vec_mean

• wdir_vec_mean_mv
• wspd_arith_mean

SGP/EBBR/E4 - Soil Temperature #5 Spiking Upwards

Soil temperature #5 experienced some erratic behavior during nighttime, spiking upwards 
slightly at times (mouse activity?).  This caused soil moisture #5 to be corrected 
downwards very slightly.

• soil_temp_5
• soil_moisture_5

SGP/EBBR/E4 - Water in Net Radiometer

The net radiometer had water in the bottom dome.  All net radiation, sensible heat flux, 
and
latent heat flux data during this period is incorrect.

• net_radiation

• sensible_heat_flux
• net_radiation
• latent_heat_flux

• net_radiation_mv

SGP/EBBR/E4 - All Measurements Incorrect Due to Low Battery Voltage

All measurements were incorrect as battery voltage fell below the level that is required 
to ensure correct data values.

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

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

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

SGP/EBBR/E4 - Improved EBBR CR10 Program

Effective 20050323.1800, the EBBR.E4 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 20050323, 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 sgp30ebbrE4.b1 data
stream.  The earlier version of the CR10 program was also used on previous
EBBR datastream names (e.g. sgp30ebbrE4.a1).

• sensible_heat_flux
• surface_soil_heat_flux_avg
• latent_heat_flux

SGP/EBBR/E4 - 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/E4 - metadata corrections

On 20050817, a series of metadata corrections and additions were completed.  These 
metadata changes apply to all EBBR.E4 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)

SGP/EBBR/E4 - Net Radiation, Sensible and Latent Heat Fluxes Incorrect

The top dome of the net radiometer was broken, resulting in net radiations that were too 
small, and thus sensible and latent heat fluxes that were too small.

• net_radiation

• sensible_heat_flux
• net_radiation
• latent_heat_flux

• net_radiation_mv

SGP/EBBR/E4 - Sensible and Latent Heat Fluxes Incorrect

The AEM hung at one position for an extended period, causing sensible and latent heat 
fluxes and gradient measurements to be incorrect.

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

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

• temp_air_left
• temp_air_right

SGP/EBBR/E4 - Wind Speed Sensor Frozen Stopped

Freezing rain froze the Wind Speed sensor to a stopped condition.

• wspd_arith_mean
• wspd_vec_mean

• wspd_vec_mean
• wspd_arith_mean

• wspd_arith_mean

SGP/EBBR/E4 - Soil Heat Flow #2 Incorrect at times

Soil Heat Flow #2 sometimes dropped to large negative values during daytime.

• surface_soil_heat_flux_2
• sensible_heat_flux
• surface_soil_heat_flux_avg
• corr_soil_heat_flow_2
• soil_heat_flow_2
• latent_heat_flux

• soil_heat_flow_2_mv

SGP/EBBR/E4 - Wind Direction Stuck at Zero

The wind direction sensor was stuck at zero.

• wdir_vec_std
• wspd_vec_mean
• wdir_vec_mean

• wdir_vec_std
• wspd_vec_mean
• wdir_vec_mean

• wdir_vec_mean_mv

SGP/EBBR/E4 - Instrument problem

Wind direction was flat lining near zero and incorrect.

• wdir_vec_std
• wdir_vec_mean

• wdir_vec_std
• wdir_vec_mean

• wdir_vec_mean_mv