SGP/SMOS/E8 - Reprocess: Wind speed calibration

EDITOR'S NOTE:  The earliest portion of the period of time 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 upon request.  The actual period of time covered by this
DQR is 930403.0000-930811.1530.


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/E8 - Incorrect E8 SMOS rain data

The E8 SMOS rain gauge pulse counter was found to be non-operational during the 16 SEP 97 
PM.  It was repaired by replacing the CR10 wiring harness on 29 OCT 97 at 1815 GMT.

• Hourly precipitation(precip)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Hourly precipitation(precip)

SGP/SMOS/E8 - 6-month Calibration Checks

During the time periods specified, the SMOS.E8 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.

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

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

• Mean Wind Speed(wspd)
• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Air Temperature(sd_temp)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Wind Speed (vector averaged)(wspd_va)
• Standard Deviation of Relative Humidity(sd_rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Barometric pressure(bar_pres)
• Beam 0 Temperature(temp)
• Unit Vector Wind Direction(wdir)
• Standard Deviation of Barometric Pressure(sd_bar_pres)
• Standard Deviation of wind direction(sd_deg)
• Standard Deviation of Wind Speed(sd_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 - Questionable E8 SMOS rain data

The E8 SMOS rain gauge pulse counter was found to be non-operational during the 16 SEP 97 
PM.  It was repaired by replacing the CR10 wiring harness on 29 OCT 97 at 1815 GMT.

• Hourly precipitation(precip)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Hourly precipitation(precip)

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)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

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