Data Quality Reports for Session: 119531 User: lovejoon82 Completed: 05/09/2009

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D050902.2PYE/MWRP/M1 - Bias in Ground Relative Humidity MeasurementpyemwrpM1.00, pyemwrpM1.b1
D050912.3PYE/SONDE/M1 - Bad RH sensorpyesondewnpnM1.b1


DQRID : D050902.2
Start DateStart TimeEnd DateEnd Time
06/17/2005000009/03/20050000
Subject:
PYE/MWRP/M1 - Bias in Ground Relative Humidity Measurement
DataStreams:pyemwrpM1.00, pyemwrpM1.b1
Description:
On June 17 2005, the MWRP was re-installed at PYE after the Super Blower was replaced by 
the old style dew blower. The relative humidity ground sensor in the dew blower is not as 
accurate. This resulted in a negative relative humidity bias of about 5.9 %. In other 
words the MWRP sensor was underestimating the relative humidity. The bias was determined by 
comparing MWRP measurements with SMET and radiosonde measurements. The MP.cfg file for 
the MWRP was changed to reflect this bias on 09/02/2005 and will take effect on 09/03/2005 
0000 GMT
Measurements:pyemwrpM1.b1:
  • Surface water vapor density at instrument(surfaceWaterVaporDensity)
  • Ambient surface relative humidity(surfaceRelativeHumidity)
pyemwrpM1.00:
  • Raw data stream - documentation not supported(raw)

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DQRID : D050912.3
Start DateStart TimeEnd DateEnd Time
08/31/2005113008/31/20051140
Subject:
PYE/SONDE/M1 - Bad RH sensor
DataStreams:pyesondewnpnM1.b1
Description:
The RH sensor heating circuit failed on this sounding.  RH values during the first part of 
the sounding oscillate between a reasonable value and a very low value.  It appears that 
(a) the heating was out of phase, and (b) incorrect values were being reported during 
the first 10 minutes or so of flight.
Measurements:pyesondewnpnM1.b1:
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)

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