Data Quality Reports for Session: 154155 User: roses1 Completed: 10/31/2013

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D050812.10SGP/THWAPS/C1 - Minor bias in humiditysgpthwapsC1.a1, sgpthwapsC1.b1
D050812.12SGP/THWAPS/C1 - Minor bias in saturation vapor pressuresgpthwapsC1.b1


DQRID : D050812.10
Start DateStart TimeEnd DateEnd Time
09/21/1999000012/07/19991100
Subject:
SGP/THWAPS/C1 - Minor bias in humidity
DataStreams:sgpthwapsC1.a1, sgpthwapsC1.b1
Description:
The THWAPS humidity sensor output was scaled so that the instrument output
voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the
co-located chilled mirror sensor at the CF suggested that the THWAPS RH
sensor was reading artifically low at high humidities because of this 100
%RH maximum. 
   
The scaling of the system was changed so that 0-1 VDC now represents 0-110
%RH. This resulted in a slight loss of precision in the measurements, but
since the RH measurement is only accurate to 2-3 %RH at best, this isn't a
significant problem.
Measurements:sgpthwapsC1.b1:
  • Humidity, relative(rh)
sgpthwapsC1.a1:
  • Humidity, relative(rh)

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DQRID : D050812.12
Start DateStart TimeEnd DateEnd Time
09/21/1999000008/10/20051445
Subject:
SGP/THWAPS/C1 - Minor bias in saturation vapor pressure
DataStreams:sgpthwapsC1.b1
Description:
The saturation vapor correction when temps are below 0C contained an error
in the multiplier.  The incorrect multiplier only equates to an error of
0.01 kPa which is less than the stated uncertainty of the measurement (+/-
0.035 kPa).
Measurements:sgpthwapsC1.b1:
  • Pressure, vapor, 60-m height, 30-min intervals(vap_pres)

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