AEM Home 30 Values Low

DQR No:                               Platform: EBBR

Subject:  E8 EBBR AEM Home 30 Values Low

Date Submitted:  August 28, 1995
Submitted By:                         _x_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other _____________________________

For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.

Platform/Measurement: EBBR/AEM
        What level data: (raw,a0,a1,b1,c1 etc): a1 (5 and 30 minute)
                                                a0 (15 minute)

    What location was the data collected at: E8, Coldwater, KS

    Period of time in question
        Begin Date 08/18/95 to present

 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 ___  incorrect                         ___  Only some data fields affected
 ___  wrong calibration
 _X_  others

 Discussion of Problem:

At least by August 18, 1995, the home 30 value intermittently dropped below
15, to typically a small negative number; 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.  I have requested site operations to
diagnose the cause of the problem on the next PM visit and hopefully correct
the problem.

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


Other observations/measurements impacted by this problem:


Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)

Flag data with this comment.

Data Processing Notes                Date

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END

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

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