Data Quality Reports for Session: 101791 User: ronmiller Completed: 09/28/2006


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D050725.1SGP/SONDE/C1 - Bad RH DatasgpsondewnpnC1.b1
D050811.5SGP/SONDE/C1 - Bad T/RH and surface P.sgpsondewnpnC1.b1


DQRID : D050725.1
Start DateStart TimeEnd DateEnd Time
07/17/2005234707/18/20050141
Subject:
SGP/SONDE/C1 - Bad RH Data
DataStreams:sgpsondewnpnC1.b1
Description:
The RH values below 6 km are incorrect.  The problem relates to a failure of the GC25 
ground check set used before this particular sounding.  The failure seems to have affected 
the sensor calibration with the effect that one of the two sensors was reading artificially 
high.  Because the internal processing software uses the highest of the two sensor 
readings, the bad sensor value is chosen whenever it is not heated.
Measurements:sgpsondewnpnC1.b1:
  • Surface dew point temperature(dp)
  • Relative humidity scaled, by total column amount from MWR(rh)


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DQRID : D050811.5
Start DateStart TimeEnd DateEnd Time
08/01/2005113208/01/20050116
Subject:
SGP/SONDE/C1 - Bad T/RH and surface P.
DataStreams:sgpsondewnpnC1.b1
Description:
Apparently multiple failures.  The radiosonde temperature sensor broke on launch causing 
an approximate 35 degC negative offset and as a result, the RH is incorrect.  Furthermore, 
it appears that the pressure sensor was off by approximately 4 hPa, though this would 
not affect the altitude calculation, the absolute pressure is wrong.
Measurements:sgpsondewnpnC1.b1:
  • Dry-Bulb Temperature(tdry)
  • Relative humidity scaled, by total column amount from MWR(rh)
  • pressure at constant pressure surface(pres)


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