Stopped Ventilation Fan

DQR No:                               Platform: EBBR

Subject: Stopped Ventilation Fan

Date Submitted: 30 August 1994
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:
        What level data: (raw,a0,a1,b1,c1 etc): a0 (5 minute),
                                                a1 (15 and 30 minute)

    What location was the data collected at: E7, Elk Falls, KS

    Period of time in question
        Begin Date 8/9/94
        End Date   8/23/94   Time 1922 GMT

 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 ___  incorrect                         _x_  Only some data fields affected
 ___  wrong calibration
 _x_  others (information only)

 Discussion of Problem:

Sometime between August 9 and 23, 1994 the ventilation fan of the
EBBR stopped; the fan guard was clogged with insect remains.  The fan was
restarted at 1922 GMT on 23 August.  Inspection of the EBBR data does not
indicate any ill affects on the calculated sensible and latent heat during
the period.  The fan may have stopped soon before the arrival of the site
operator on 23 August.  I cannot suggest flagging the data as incorrect, but
this message should still be attached to the data so that anyone who might
discover something unusual may have some basis for explaining it.

The quantities that are normally affected by stoppage of the ventilation to
the temperature and relative humidity sensors are:

5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, and vp_bot

15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l

30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot, bowen, e, h

Other observations/measurements impacted by this problem:

see list above

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

Enclose the message above with the data if possible.

Data Processing Notes                Date

-------------------------------------------------------------------
END

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

• Soil heat flow 4 (mV)(soil_heat_flow_4_mv)
• Soil moisture 2 (resistance)(soil_moisture_2_r)
• lon(lon)
• Net radiation (mV)(net_radiation_mv)
• Soil temperature 1 (resistance ratio)(soil_temp_1_rr)
• Reference temperature in enclosure (resistance ratio)(temp_reference_rr)
• Battery voltage(battery_voltage)
• Soil moisture 5 (resistance)(soil_moisture_5_r)
• Right relative humidity (mV)(rh_right_mv)
• Soil temperature 3 (resistance ratio)(soil_temp_3_rr)
• Soil moisture 1 (resistance)(soil_moisture_1_r)
• Wind speed arithmetic mean(wspd_arith_mean)
• Soil heat flow 1 (mV)(soil_heat_flow_1_mv)
• Right air temperature(temp_air_right)
• Wind direction vector mean (mV)(wdir_vec_mean_mv)
• Soil moisture 4 (resistance)(soil_moisture_4_r)
• Left relative humidity (mV)(rh_left_mv)
• Soil temperature 5 (resistance ratio)(soil_temp_5_rr)
• Atmospheric pressure (mV)(atmos_pressure_mv)
• Left air temperature(temp_air_left)
• -180.0 - +180.0(alt)
• Soil heat flow 3 (mV)(soil_heat_flow_3_mv)
• North Latitude(lat)
• Soil temperature 2 (resistance ratio)(soil_temp_2_rr)
• Time offset from base_time(time_offset)
• Soil heat flow 2 (mV)(soil_heat_flow_2_mv)
• Soil moisture 3 (resistance)(soil_moisture_3_r)
• Right T/RH sensor temperature (resistance ratio)(temp_trh_right_rr)
• Left T/RH sensor temperature (resistance ratio)(temp_trh_left_rr)
• Soil temperature 4 (resistance ratio)(soil_temp_4_rr)
• Soil heat flow 5 (mV)(soil_heat_flow_5_mv)
• base time in epoch(base_time)
• AEM position indicator(home_signal)

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