Data Quality Reports for Session: 103389 User: vpayne Completed: 12/21/2006


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060928.4NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdrynsasondewnpnC1.b1
D061011.1NSA/SONDE/C1 - Incorrect surface values of T and RHnsasondewnpnC1.b1
D061114.3NSA/SONDE/C1 - RH sensor failurensasondewnpnC1.b1


DQRID : D060928.4
Start DateStart TimeEnd DateEnd Time
09/29/2006050012/31/99992359
Subject:
NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry
DataStreams:nsasondewnpnC1.b1
Description:
The output precision of the following variables was increased 20060929:

   alt	changed from 1m to 0.1m
   dp	changed from 0.1degC to 0.01degC
   pres changed from 0.1 hPa to 0.01 hPa
   RH	changed from 1%RH to 0.01%RH
   tdry changed from .1degC to 0.01degC

Note that the increase in precision does not necessarily imply an increase
in accuracy.  Users are cautioned to continue to use their best scientific
judgement when using these or any other data.
Measurements:nsasondewnpnC1.b1:
  • Relative humidity scaled, by total column amount from MWR(rh)
  • Dry-Bulb Temperature(tdry)
  • altitude above sea levelaltunits(alt)
  • pressure at constant pressure surface(pres)
  • Surface dew point temperature(dp)


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DQRID : D061011.1
Start DateStart TimeEnd DateEnd Time
10/07/2006052410/07/20060525
Subject:
NSA/SONDE/C1 - Incorrect surface values of T and RH
DataStreams:nsasondewnpnC1.b1
Description:
The radiosonde was launched too quickly after being removed from the ground check set.  As 
a result, the system did not equilibrate with the local ground conditions and the 
automatically entered surface values are incorrect.
Measurements:nsasondewnpnC1.b1:
  • Relative humidity scaled, by total column amount from MWR(rh)
  • Dry-Bulb Temperature(tdry)
  • Surface dew point temperature(dp)


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DQRID : D061114.3
Start DateStart TimeEnd DateEnd Time
10/28/2006053210/28/20060710
Subject:
NSA/SONDE/C1 - RH sensor failure
DataStreams:nsasondewnpnC1.b1
Description:
It appears that one of the two RH sensors on this radiosonde was affected by ice after 
emerging from a low cold cloud.  As a result the reported RH values oscillate by about 10 
percent until the alternate heating cycle stops.  I suspect the lower value is more close 
to correct, but can't be absolutely sure.
Measurements:nsasondewnpnC1.b1:
  • Relative humidity scaled, by total column amount from MWR(rh)
  • Surface dew point temperature(dp)


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