SGP/SMOS/E7 - Snow depth sensor removed; data reported as missing

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Time of Minimum Snow Depth(time_min_snow)
• Maximum Snow Depth(max_snow)
• Time of Maximum Snow Depth(time_max_snow)
• Minimum Snow Depth(min_snow_depth)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

SGP/SMOS/E9 - Snow depth sensor removed; data reported as missing

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Minimum Snow Depth(min_snow_depth)
• Time of Minimum Snow Depth(time_min_snow)
• Maximum Snow Depth(max_snow)
• Time of Maximum Snow Depth(time_max_snow)

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

SGP/SMOS/E11 - Snow depth sensor removed; data reported as missin

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Time of Minimum Snow Depth(time_min_snow)
• Maximum Snow Depth(max_snow)
• Minimum Snow Depth(min_snow_depth)
• Time of Maximum Snow Depth(time_max_snow)

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

SGP/SMOS/E13 - Snow depth sensor removed; data reported as missin

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

• Time of Maximum Snow Depth(time_max_snow)
• Maximum Snow Depth(max_snow)
• Time of Minimum Snow Depth(time_min_snow)
• Minimum Snow Depth(min_snow_depth)

SGP/SMOS/E15 - Snow depth sensor removed; data reported as missin

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Minimum Snow Depth(min_snow_depth)
• Time of Minimum Snow Depth(time_min_snow)
• Maximum Snow Depth(max_snow)
• Time of Maximum Snow Depth(time_max_snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

SGP/SMOS/E20 - Snow depth sensor removed; data reported as missin

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Maximum Snow Depth(max_snow)
• Time of Minimum Snow Depth(time_min_snow)
• Minimum Snow Depth(min_snow_depth)
• Time of Maximum Snow Depth(time_max_snow)

SGP/SMOS/E24 - Snow depth sensor removed; data reported as missin

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Time of Minimum Snow Depth(time_min_snow)
• Maximum Snow Depth(max_snow)
• Time of Maximum Snow Depth(time_max_snow)
• Minimum Snow Depth(min_snow_depth)

SGP/SMOS/E21 - Snow depth sensor removed; data reported as missin

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Minimum Snow Depth(min_snow_depth)
• Time of Minimum Snow Depth(time_min_snow)
• Time of Maximum Snow Depth(time_max_snow)
• Maximum Snow Depth(max_snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

SGP/SMOS/E1 - Snow depth sensor removed; data reported as missing

The snow depth sensor was removed.  The program was changed to read -9999 into the data 
stream.

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

• Time of Minimum Snow Depth(time_min_snow)
• Maximum Snow Depth(max_snow)
• Time of Maximum Snow Depth(time_max_snow)
• Minimum Snow Depth(min_snow_depth)

SGP/SMOS/E4 - Snow depth sensor removed; data reported as missing

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

• Minimum Snow Depth(min_snow_depth)
• Time of Maximum Snow Depth(time_max_snow)
• Time of Minimum Snow Depth(time_min_snow)
• Maximum Snow Depth(max_snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

SGP/SMOS/E8 - Snow depth sensor removed; data reported as missing

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Time of Minimum Snow Depth(time_min_snow)
• Minimum Snow Depth(min_snow_depth)
• Time of Maximum Snow Depth(time_max_snow)
• Maximum Snow Depth(max_snow)

SGP/SMOS/E5 - Snow depth sensor removed; data reported as missing

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Time of Minimum Snow Depth(time_min_snow)
• Time of Maximum Snow Depth(time_max_snow)
• Maximum Snow Depth(max_snow)
• Minimum Snow Depth(min_snow_depth)

SGP/SMOS/E6 - Snow depth sensor removed; data reported as missing

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Minimum Snow Depth(min_snow_depth)
• Time of Maximum Snow Depth(time_max_snow)
• Time of Minimum Snow Depth(time_min_snow)
• Maximum Snow Depth(max_snow)

• Snow Depth Sensor(snow_sen)
• Existence of snow?(snow)

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

SGP/SMOS/E3 - Snow depth sensor removed; data reported as missing

The snow depth sensor was removed from service.  The program was changed so that -9999 is 
entered into the datastream.

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

• Time of Maximum Snow Depth(time_max_snow)
• Maximum Snow Depth(max_snow)
• Time of Minimum Snow Depth(time_min_snow)
• Minimum Snow Depth(min_snow_depth)

• Existence of snow?(snow)
• Snow Depth Sensor(snow_sen)

SGP/SMOS/E27 - Instrument problem, Sensor failure

The SMOS wind sensor at E27 was reporting good wind
direction for 0 and 180 degrees, but bad wind directions 
for 090 and 270 degree (sensor problem).  This problem
was noted during the SMOS 6 month calibration check on
2003-05-15.  Sensor replacement and wiring changes
cleared the problem.

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

• Unit Vector Wind Direction(wdir)

• Unit Vector Wind Direction(wdir)

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

SGP/SMOS/E13 - Sensor failure

Beginning around 1415 UTC on 08/30, the RH readings for
this instrument were frequently around 0 (sometimes
there are erratic spikes upward from 0 for periods of
time). Rainfall appears to have been the cause of the
erroneous readings, as the instrument appeared to fail
in and around the time of heavy rains.

A maintenance visit occurred on 09/04, afterwards data
returned to normal values.

• Standard deviation of Relative Humidity(sd_rh)
• Relative humidity scaled, by total column amount from MWR(rh)
• Standard deviation of Vapor Pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)

• Relative humidity scaled, by total column amount from MWR(rh)
• Vapor Pressure (kiloPascals)(vap_pres)

• Standard deviation of Relative Humidity(sd_rh)
• Relative humidity scaled, by total column amount from MWR(rh)

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

• Relative humidity scaled, by total column amount from MWR(rh)
• Vapor Pressure (kiloPascals)(vap_pres)

SGP/SMOS/E6 - Sensor failure

On 08/30, after heavy rains had fallen, the RH sensor
began occasionally reporting readings of around 0 or
erratic data.  Although frequently readings appearred
reasonable, they unpredictably dropped or become erratic
again for long periods of time.  The sensor was replaced
on 09/11/2003 @ 16:40 GMT.

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

• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity scaled, by total column amount from MWR(rh)

• Standard deviation of Relative Humidity(sd_rh)
• Relative humidity scaled, by total column amount from MWR(rh)
• Vapor Pressure (kiloPascals)(vap_pres)

• Relative humidity scaled, by total column amount from MWR(rh)
• Vapor Pressure (kiloPascals)(vap_pres)

• Standard deviation of Vapor Pressure(sd_vap_pres)
• Relative humidity scaled, by total column amount from MWR(rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard deviation of Relative Humidity(sd_rh)

SGP/SMOS/E4 - Sensor failure--RH data bad

RH readings are questionable during high moisture conditions.  Readings frequently are 
above tolerance (104%) during saturated conditions. During non-saturated conditions the RH% 
readings are fine.

• Relative humidity scaled, by total column amount from MWR(rh)
• Vapor Pressure (kiloPascals)(vap_pres)

• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity scaled, by total column amount from MWR(rh)

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

• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity scaled, by total column amount from MWR(rh)

• Vapor Pressure (kiloPascals)(vap_pres)
• Relative humidity scaled, by total column amount from MWR(rh)

SGP/SMOS/E6 - Temperature values incorrect, sensor failure.

The temperature element of the T/RH probe failed.  Sensor was replaced.

• Time of Maximum Vapor Pressure(time_max_vap_pres)
• Time of Maximum Temperature(time_max_temp)
• Time of Minimum Temperature(time_min_temp)
• Minimum Temperature(min_temp)
• Maximum Vapor Pressure(max_vap_pres)
• Maximum Temperature(max_temp)
• Minimum Vapor Pressure(min_vap_pres)
• Time of Minimum Vapor Pressure(time_min_vap_pres)

• Vapor Pressure (kiloPascals)(vap_pres)
• Environmental Temperature (hybrid-b grid)(temp)

• Standard deviation of Vapor Pressure(sd_vap_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Environmental Temperature (hybrid-b grid)(temp)
• Vapor Pressure (kiloPascals)(vap_pres)

• Environmental Temperature (hybrid-b grid)(temp)
• Vapor Pressure (kiloPascals)(vap_pres)

• Standard deviation of Vapor Pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Environmental Temperature (hybrid-b grid)(temp)

SGP/SMOS/E20 - 6-month Calibration Checks

During the time periods specified, the SMOS.E20 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.

• surface wind speed(wspd)
• Wind Speed (vector averaged)(wspd_va)
• barometric pressure(bar_pres)
• Environmental Temperature (hybrid-b grid)(temp)
• Unit Vector Wind Direction(wdir)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of wind direction(sd_deg)
• Relative humidity scaled, by total column amount from MWR(rh)

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

• Wind Speed (vector averaged)(wspd_va)
• Unit Vector Wind Direction(wdir)
• Standard Deviation of wind direction(sd_deg)
• Standard Deviation of Air Temperature(sd_temp)
• Relative humidity scaled, by total column amount from MWR(rh)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard deviation of Barometric Pressure(sd_bar_pres)
• surface wind speed(wspd)
• Standard Deviation of Wind Speed(sd_wspd)
• barometric pressure(bar_pres)
• Standard deviation of Vapor Pressure(sd_vap_pres)
• Standard deviation of Relative Humidity(sd_rh)
• Environmental Temperature (hybrid-b grid)(temp)

SGP/SMOS/E4 - Reprocess: Wind direction offset

When the SGP.E4 SMOS tower was installed it was not aligned
properly resulting in a 7 degree offset.  On 3/9/05, the
datalogger program was modifed to correct for this offset.

• Unit Vector Wind Direction(wdir)

• Unit Vector Wind Direction(wdir)

SGP/SMOS/E3 - Reprocess: Wind direction offset

When the SGP.E3 SMOS tower was installed it was not aligned
properly resulting in a 7 degree offset.  On 3/9/05, the 
datalogger program was modified to correct for this offset.

• Unit Vector Wind Direction(wdir)

• Unit Vector Wind Direction(wdir)

SGP/SMOS/E6 - Reprocess: Wind direction offset

When the SGP.E6 SMOS tower was installed it was not aligned
properly resulting in a 7 degree offset.  On 3/10/05, the
datalogger program was modified to correct for this offset.

• Unit Vector Wind Direction(wdir)

• Unit Vector Wind Direction(wdir)

SGP/SMOS/E7 - Reprocess: Wind direction offset

When the SGP.E7 SMOS tower was installed it was not aligned
properly resulting in a 6 degree offset.  On 3/08/05, the
datalogger program was modified to correct for this offset.

• Unit Vector Wind Direction(wdir)

• Unit Vector Wind Direction(wdir)

SGP/SMOS/E27 - Reprocess: Wind direction offset

When the SGP.E27 SMOS tower was installed it was not aligned
properly resulting in a 7 degree offset.

• Unit Vector Wind Direction(wdir)

• Unit Vector Wind Direction(wdir)

• Unit Vector Wind Direction(wdir)

• Unit Vector Wind Direction(wdir)