SGP/SMOS/E20 - Reprocess: Wind speed calibrations

EDITOR'S NOTE:  The earliest portion of the time period covered
by this DQR occurred prior to the begin date of regular ARM data.
Those data are not readily available from the ARM Archive but are
available by special request.  The actual period of time covered
by this DQR is 930403-930819.1430.


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)

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

SGP/SMOS/E8 - Reprocess: Incorrect wind speed calibration

The wrong data logger program file was loaded into the data logger.
The best guess is that this was done when the system was relocated
on 10 MAY 95.  It was discovered and corrected during the 6 month 
sensor verification.

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

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

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

SGP/SMOS/E8 - Reprocess: Incorrect wind directions from E8 SMOS

When the Wind Monitor was changed at E8 for scheduled PM, the replacement sensor was 
incorrectly wired to the data logger.  It did not effect the wind speed readings, but wind 
directions had E and W reversed.  Thus winds from 15 deg were reported as being from 345 
deg, and vice-versa, and winds from 165 deg were reported as being from 195 degrees, and 
vice-versa.

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

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

SGP/SMOS/E8 - Icing affected E8 SMOS wind speed

Icing conditions at E8 caused the SMOS wind speed data to be questionable
between 1400 and 2130 GMT on 16 MAR 98 and again between 0430 and 1630 GMT
on 17 MAR 98. The data appear to be unaffected between those two periods,
but may also be questionable.

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

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

• null(Raw data stream - documentation not supported)

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

SGP/SMOS/E8 - Questionable SMOS wind speeds at E8

Wind speed data reported between 0800 GMT on 30 JAN 99 and 0800 GMT on 31 JAN 99
 is questionable, apparently due to icing.

No other data seems to have been affected.

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

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

• null(Raw data stream - documentation not supported)

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

SGP/SMOS/E8 - E8 SMOS lowered to surface to install couterweights

The E8 SMOS was lowered to the surface on 5 OCT 1999 between 1325 and 1350 GMT 
while counterweights were installed.  All temperature and humidity data are questionable 
during this period.

• null(Raw data stream - documentation not supported)

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

• Time of Minimum Temperature(time_min_temp)
• Minimum Vapor Pressure(min_vap_pres)
• Minimum Temperature(min_temp)
• Minimum Relative Humidity(min_rh)
• Time of Maximum Temperature(time_max_temp)
• Time of Minimum Relative Humidity(time_min_rh)
• Time of Maximum Relative Humidity(time_max_rh)
• Maximum Vapor Pressure(max_vap_pres)
• Time of Maximum Vapor Pressure(time_max_vap_pres)
• Time of Minimum Vapor Pressure(time_min_vap_pres)
• Maximum Temperature(max_temp)

• null(Raw data stream - documentation not supported)

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

SGP/SMOS/E8 - E8 SMOS down for tower replacement

The E8 SMOS was shut down from 12 MAY 1999 at 1600 GMT until 20 MAY 1999 at 1735 GMT 
while the tower was replaced.

• null(Raw data stream - documentation not supported)

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

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

• null(Raw data stream - documentation not supported)

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