SGP/SMOS/E7 - 6-month Calibration Checks

During the time periods specified, the SMOS.E7 tower was
lowered for 6-month Calibration Checks.   During these times 
wind data are incorrect and temperature and humidity data 
may be incorrect.

Note, exact times when tower was down or maintenance was
being performed is sometimes unknown.  Users should use
the remaining data from these days with caution.

• Time of Minimum Wind Speed(time_min_wspd)
• Time of Maximum Temperature(time_max_temp)
• Maximum Vapor Pressure(max_vap_pres)
• Minimum of Wind speed(min_wspd)
• Time of Minimum Vapor Pressure(time_min_vap_pres)
• Minimum Temperature(min_temp)
• Time of Maximum Barometric Pressure(time_max_bar_pres)
• Maximum Temperature(max_temp)
• Time of Maximum Relative Humidity(time_max_rh)
• Time of Maximum Wind Speed(time_max_wspd)
• Time of Minimum Barometric Pressure(time_min_bar_pres)
• Minimum Relative Humidity(min_rh)
• Time of Maximum Vapor Pressure(time_max_vap_pres)
• Minimum Vapor Pressure(min_vap_pres)
• Maximum Relative Humidity(max_rh)
• Minimum Barometric Pressure(min_bar_pres)
• maximum wind speed (gusts)(max_wspd)
• Maximum Barometric Pressure(max_bar_pres)
• Time of Minimum Relative Humidity(time_min_rh)
• Time of Minimum Temperature(time_min_temp)

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Barometric Pressure(sd_bar_pres)
• Unit Vector Wind Direction(wdir)
• Barometric pressure(bar_pres)
• Standard Deviation of wind direction(sd_deg)
• Beam 0 Temperature(temp)
• Standard Deviation of Wind Speed(sd_wspd)
• Wind Speed (vector averaged)(wspd_va)
• Mean Wind Speed(wspd)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Relative Humidity(sd_rh)

• Relative humidity inside the instrument enclosure(rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Wind Speed (vector averaged)(wspd_va)
• Unit Vector Wind Direction(wdir)
• Mean Wind Speed(wspd)
• Standard Deviation of wind direction(sd_deg)
• Beam 0 Temperature(temp)
• Barometric pressure(bar_pres)

SGP/SMOS/E7 - Reprocess: Incorrect Wind Speed data from SMOS E7

Editor's Note:  A portion of the period of time to which this DQR applies is prior to the 
begin date of regular ARM data collection.  The actual begin date of the problem 
described in this DQR is 950224.0400.

Incorrect Wind Speed calibration factor used at installation.  The correct 
calibration factor was loaded into the data logger on 20 APR 95 at 2014 GMT.

• Wind Speed (vector averaged)(wspd_va)
• Mean Wind Speed(wspd)
• Standard Deviation of Wind Speed(sd_wspd)

• Time of Minimum Wind Speed(time_min_wspd)
• maximum wind speed (gusts)(max_wspd)
• Time of Maximum Wind Speed(time_max_wspd)
• Minimum of Wind speed(min_wspd)

• Wind Speed (vector averaged)(wspd_va)
• Mean Wind Speed(wspd)

SGP/SMOS/E7 - Questionable Humidity data

Editor's note:  A portion of the period of time to which this DQR 
applies is prior to the begin date of regular ARM data collection.  
The actual begin date of the problem described in this DQR is 950224.0400.

All SMOS E7 humidity data taken during this period are questionable.
The sensor was replaced several times. A "good" sensor was finally 
installed on 17 MAY 95 at 1732 GMT.

• Maximum Vapor Pressure(max_vap_pres)
• Time of Maximum Relative Humidity(time_max_rh)
• Minimum Relative Humidity(min_rh)
• Time of Maximum Vapor Pressure(time_max_vap_pres)
• Time of Minimum Vapor Pressure(time_min_vap_pres)
• Minimum Vapor Pressure(min_vap_pres)
• Maximum Relative Humidity(max_rh)
• Time of Minimum Relative Humidity(time_min_rh)

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Relative Humidity(sd_rh)

• Relative humidity inside the instrument enclosure(rh)
• Vapor Pressure (kiloPascals)(vap_pres)

SGP/SMOS/E7 - Missing data

Data missing, apparently due to maintenance.

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Snow Depth Sensor(snow_sen)
• lon(lon)
• Vapor Pressure (kiloPascals)(vap_pres)
• base time(base_time)
• Relative humidity inside the instrument enclosure(rh)
• Batter Voltage(vbat)
• Dummy altitude for Zeb(alt)
• Standard Deviation of Barometric Pressure(sd_bar_pres)
• Hourly precipitation(precip)
• Unit Vector Wind Direction(wdir)
• Barometric pressure(bar_pres)
• Beam 0 Temperature(temp)
• Standard Deviation of wind direction(sd_deg)
• Standard Deviation of Wind Speed(sd_wspd)
• Wind Speed (vector averaged)(wspd_va)
• lat(lat)
• Mean Wind Speed(wspd)
• Snow Depth(snow)
• Time offset of tweaks from base_time(time_offset)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Relative Humidity(sd_rh)

• Relative humidity inside the instrument enclosure(rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Hourly precipitation(precip)
• lat(lat)
• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• lon(lon)
• Wind Speed (vector averaged)(wspd_va)
• Unit Vector Wind Direction(wdir)
• Dummy altitude for Zeb(alt)
• Mean Wind Speed(wspd)
• Standard Deviation of wind direction(sd_deg)
• Beam 0 Temperature(temp)
• Barometric pressure(bar_pres)

SGP/SMOS/E7 - Reprocess: Wind direction incorrect

The 10m tower at E7 fell on 20 FEB 97 some time after 2130 GMT.  It was returned to 
service on 13 MAR 97 at 0600 GMT, but the wind monitor was incorrectly installed resulting in 
wind directions being 180 deg out until it was re-oriented on 20 MAR 97 at 1600 GMT.

• Unit Vector Wind Direction(wdir)
• Standard Deviation of wind direction(sd_deg)

• Standard Deviation of wind direction(sd_deg)
• Unit Vector Wind Direction(wdir)

SGP/SMOS/E7 - Humidity data drifted out of tolerance

The humidity data reported by the Elk Falls (E7) SMOS drifted out of tolerance starting on 
approximately 4 OCT 96.  The RH probe started reporting values exceeding 104% RH.  The 
SMOS underwent a 6-month verification check on 13 NOV 96, but the reference RH sensor was 
not operating properly at the time.  At the mentor's request, the T/RH probe was replaced 
on 4 FEB 97, but the replacement probe was not operating within specifications.  Due to 
lack of calibrated spare probes, the bad replacement T/RH probe was not replaced until 16 
APR 97.

• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Relative humidity inside the instrument enclosure(rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Relative Humidity(sd_rh)

• Relative humidity inside the instrument enclosure(rh)
• Vapor Pressure (kiloPascals)(vap_pres)