SGP/EBBR/E20 - AEM Home 30 Values Low

The first EBBR to achieve annual calibration changeout was Meeker, Ok, E20.
However, soon after changeout on August 9, 1995, the home 30 value dropped below
15, intermittently, to typically 0.3 to 0.5; this causes a data quality message
to be output in the site operations log as the stated acceptable range for home
30 is 15 to 34.999999.  However, no data is incorrect as a result of this
condition.

No replacement AEM is available, as the changeout kit AEMs are somewhat
different from the initial units.  Site operations hopes to have time to
diagnose the problem on the next PM visit and correct the problem.  At
present, data quality is not jeopardized.

I will submit another DQR or addendum when successful replacement of the
AEM is accomplished.

• Surface soil heat flux, average of fluxes 1-5(surface_soil_heat_flux_avg)
• AEM position indicator 0 to 15 mins(home_signal_15)
• Bowen ratio(bowen_ratio)
• Top air temperature(temp_air_top)
• Top T/RH sensor temperature(temp_trh_top)
• lon(lon)
• Bottom relative humidity (fractional)(rh_bottom_fraction)
• Reference temperature in enclosure(temp_reference)
• Surface sensible heat flux(sensible_heat_flux)
• -180.0 - +180.0(alt)
• Bottom T/RH sensor temperature(temp_trh_bottom)
• Soil moisture 5, gravimetric(soil_moisture_5)
• Soil moisture 4, gravimetric(soil_moisture_4)
• Soil moisture 3, gravimetric(soil_moisture_3)
• Soil moisture 2, gravimetric(soil_moisture_2)
• Bottom vapor pressure(vapor_pressure_bottom)
• Soil moisture 1, gravimetric(soil_moisture_1)
• North Latitude(lat)
• AEM position indicator 15 to 30 mins(home_signal_30)
• Wind direction vector mean(wdir_vec_mean)
• Surface soil heat flux 4(surface_soil_heat_flux_4)
• Surface soil heat flux 3(surface_soil_heat_flux_3)
• Surface soil heat flux 2(surface_soil_heat_flux_2)
• Surface soil heat flux 1(surface_soil_heat_flux_1)
• Soil heat capacity 5(soil_heat_capacity_5)
• Bottom air temperature(temp_air_bottom)
• Soil heat capacity 4(soil_heat_capacity_4)
• Surface latent heat flux(latent_heat_flux)
• Soil heat capacity 3(soil_heat_capacity_3)
• Soil heat capacity 2(soil_heat_capacity_2)
• Wind speed arithmetic mean(wspd_arith_mean)
• Surface soil heat flux 5(surface_soil_heat_flux_5)
• Soil temperature mean 3(soil_temp_3)
• Wind direction vector mean standard deviation(wdir_vec_std)
• Soil heat flow 4(soil_heat_flow_4)
• Net radiation(net_radiation)
• Soil heat capacity 1(soil_heat_capacity_1)
• Half hour averaged soil temperature 4(soil_temp_4)
• Soil heat flow 5(soil_heat_flow_5)
• Half hour averaged soil temperature 5(soil_temp_5)
• Soil heat flow 2(soil_heat_flow_2)
• Soil heat flow 3(soil_heat_flow_3)
• Soil heat flow 1(soil_heat_flow_1)
• Atmospheric pressure(atmos_pressure)
• Soil temperature 1(soil_temp_1)
• Soil temperature 2(soil_temp_2)
• Time offset from base_time(time_offset)
• Top relative humidity (fractional)(rh_top_fraction)
• Change in energy storage 3, 0-5 cm soil layer(energy_storage_change_3)
• Change in energy storage 2, 0-5 cm soil layer(energy_storage_change_2)
• Change in energy storage 1, 0-5 cm soil layer(energy_storage_change_1)
• Top vapor pressure(vapor_pressure_top)
• base time in epoch(base_time)
• Soil heat flow 4, corrected for soil moisture(corr_soil_heat_flow_4)
• Soil heat flow 3, corrected for soil moisture(corr_soil_heat_flow_3)
• Change in energy storage 5, 0-5 cm soil layer(energy_storage_change_5)
• Change in energy storage 4, 0-5 cm soil layer(energy_storage_change_4)
• Soil heat flow 5, corrected for soil moisture(corr_soil_heat_flow_5)
• Soil heat flow 2, corrected for soil moisture(corr_soil_heat_flow_2)
• Soil heat flow 1, corrected for soil moisture(corr_soil_heat_flow_1)
• Wind speed vector mean(wspd_vec_mean)

• -180.0 - +180.0(alt)
• Net radiation(net_radiation)
• North Latitude(lat)
• base time in epoch(base_time)
• Top T/RH sensor temperature(temp_trh_top)
• lon(lon)
• Top relative humidity (fractional)(rh_top_fraction)
• Wind direction vector mean standard deviation(wdir_vec_std)
• AEM position indicator(home_signal)
• Bottom T/RH sensor temperature(temp_trh_bottom)
• Top vapor pressure(vapor_pressure_top)
• Bottom air temperature(temp_air_bottom)
• Wind speed arithmetic mean(wspd_arith_mean)
• Top air temperature(temp_air_top)
• Atmospheric pressure(atmos_pressure)
• Wind direction vector mean(wdir_vec_mean)
• Wind speed vector mean(wspd_vec_mean)
• Bottom vapor pressure(vapor_pressure_bottom)
• Reference temperature in enclosure(temp_reference)
• Bottom relative humidity (fractional)(rh_bottom_fraction)
• Time offset from base_time(time_offset)