Intermittent Stopped or Slowed Aspirator Fans

DQR No:                               Platform: EBBR

Subject: Intermittent Stopped or Slowed Aspirator Fans

Date Submitted: 26 September 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: EBBR/T and RH
        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 8/18/94   Time 1200 GMT
        End Date   9/21/94   Time 1530 GMT

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

 Discussion of Problem:

Around 1200 GMT on September 21, 1994 the aspirator fans of the EBBR
intermittently stopped or slowed significantly; the fans were clogged with
insect remains and spider webs.  Only a few weeks earlier the same
situation occurred at this EBBR.  The 15 minute data reveals that most of
the time the right aspirator fan was the one that failed to work, although
there are times that it appears that the left fan was either not working
also or was the only one not working.  Unlike the previous occurrence, the
30 minute flux data does show some indication of this problem, although, as
usual, it is far easier to see in the 15 minute data.  The fans were cleaned
out and restarted at 1530 GMT on September 21, 1994.  The data listed below
should be flagged as incorrect for the period shown above.

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)