SGP/SMOS/E9 - Reprocess: Wind speed calibrations

EDITOR'S NOTE:  The earliest portion of the period of time covered
by this DQR occurred prior to the begin data of regular ARM data.
Those data are not readily available from the ARM archive but are
available upon request.  The actual period of time covered by this
DQR is 930331.0000-930823.2359.


Practically all of the information in this DQR is derived from
P930723.1 and C930830.1, both of which were submitted by Dick Hart. 

The calibrations initially used for wind speeds on SMOS systems at 
Coldwater (E8), Ashton (E9), the central faciality (E13), Ringwood (E15),
and Meeker (E20) were originally "generic"values, but analysis of the 
N.I.S.T traceable calibration data reveals that use of these "generic" 
calibrations produces data with insufficient accuracy. The calibrations 
for the wind speed sensor associated with the instrument must be used 
in the datalogger program in order to obtain data with a 1% uncertainty.
For the worst case, one wind speed sensor underestimates the wind speed 
by 1.1 m/s at 30 m/s when the "generic" calibration is used.  This is 
on top of the 1% calibration uncertainty.  

No unreported data loss occurred as a result of this calibration question, 
but users of the data should adjust the wind speed values before analysis 
involving these wind speed values.

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

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

SGP/SMOS/E9 - Tower lowered for work on instrumentation

Due to tower being lowered to work on instrumentation, all wind data
taken between 1515 and 2030 GMT on 18 OCT 94 are incorrect.

• Standard Deviation of wind direction(sd_deg)
• Mean Wind Speed(wspd)
• Unit Vector Wind Direction(wdir)
• Wind Speed (vector averaged)(wspd_va)

• Mean Wind Speed(wspd)
• Standard Deviation of wind direction(sd_deg)
• Standard Deviation of Wind Speed(sd_wspd)
• Unit Vector Wind Direction(wdir)
• Wind Speed (vector averaged)(wspd_va)

SGP/SMOS/E9 - 6-month Calibration Checks

During the time periods specified, the SMOS.E9 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.

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

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

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

SGP/SMOS/E9 - Bad Humidity Data

During a rain storm the relative humidity readings (and vapor pressure
which is derived from RH) became erroneous.  The sensor electronics may
have gotten wet.  The sensor recovered from whatever problem occurred
e.g., the sensor dried out).  No permanent damage occurred.

No other measurements appear to have been affected.  Temperature
measurements during the period in question, agree with those obtained
by the EBBR.

• lon(lon)
• Maximum Vapor Pressure(max_vap_pres)
• Minimum of Wind speed(min_wspd)
• Time of Minimum Snow Depth(time_min_snow)
• Minimum Barometric Pressure(min_bar_pres)
• Time of Maximum Relative Humidity(time_max_rh)
• Minimum Vapor Pressure(min_vap_pres)
• Time of Minimum Temperature(time_min_temp)
• Time of Maximum Temperature(time_max_temp)
• Time of Maximum Barometric Pressure(time_max_bar_pres)
• Maximum Barometric Pressure(max_bar_pres)
• Time of Maximum Vapor Pressure(time_max_vap_pres)
• base time(base_time)
• Minimum Relative Humidity(min_rh)
• Time of Minimum Vapor Pressure(time_min_vap_pres)
• Maximum Temperature(max_temp)
• Time of Minimum Barometric Pressure(time_min_bar_pres)
• lat(lat)
• Time offset of tweaks from base_time(time_offset)
• maximum wind speed (gusts)(max_wspd)
• Time of Minimum Wind Speed(time_min_wspd)
• Time of Maximum Wind Speed(time_max_wspd)
• Time of Maximum Snow Depth(time_max_snow)
• Time of Minimum Relative Humidity(time_min_rh)
• Dummy altitude for Zeb(alt)
• Minimum Snow Depth(min_snow_depth)
• Maximum Relative Humidity(max_rh)
• Maximum Snow Depth(max_snow)
• Minimum Temperature(min_temp)

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

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

SGP/SMOS/E9 - Tower lowered for work on instrumentation

Due to tower being lowered to work on instrumentation, all temperature
and humidity data taken between 1515 and 2030 GMT on 18 OCT 94 are
questionable.

• Vapor Pressure (kiloPascals)(vap_pres)
• Beam 0 Temperature(temp)
• Relative humidity inside the instrument enclosure(rh)

• Beam 0 Temperature(temp)
• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Relative Humidity(sd_rh)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Vapor Pressure (kiloPascals)(vap_pres)

SGP/SMOS/E9 - Missing data incorrectly reported

Data for this brief period were incorrectly reported, some as 0.  These data should have 
been reported as missing, -9999.

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

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

SGP/SMOS/E9 - Incorrect wind data

Wind Monitor mount broke, sensor hanging upside down.  Repaired
on 24 OCT 95.

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

• Standard Deviation of wind direction(sd_deg)
• Unit Vector Wind Direction(wdir)
• Mean Wind Speed(wspd)
• Wind Speed (vector averaged)(wspd_va)

• Mean Wind Speed(wspd)
• Standard Deviation of Wind Speed(sd_wspd)
• Unit Vector Wind Direction(wdir)
• Wind Speed (vector averaged)(wspd_va)
• Standard Deviation of wind direction(sd_deg)

SGP/SMOS/E9 - Erroneous SMOS E9 humidity data

SMOS E9 humidity data were erroneous between 0630 on 25 MAY 97 and 2000 GMT
on 28 MAY 97.  The cause is unknown.  Site Ops personnel visited the
site on 29 MAY 97 and found no problems.

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

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

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