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.

Calibration results are available from the OMIS database at 
    
http://www.ops.sgp.arm.gov:591/smos6cal/default.htm 
To view all 6-month calibration reports leave the date time entry blank.

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

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

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

SGP/SMOS/E7 - Wind sensor binding at low wind speeds

The wind sensor bearings were failing causing the wind speed sensor to report lower than 
actual wind speeds when the winds were below 2 m/s.  The wind monitor was replaced on 
05/29/2007 but this failed to correct the problem.  Subsequently, the site was flooded and it 
took some time to re-establish normal operations.  The wind sensor was again replaced on 
10/30/2007.  After replacement the wind data from the SMOS compared more favorably to 
the co-located EBBR data.

• Time of Minimum Wind Speed(time_min_wspd)
• Minimum of Wind speed(min_wspd)

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

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