Data Quality Reports for Session: 106131 User: bartforman Completed: 06/18/2007

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D030325.2SGP/THWAPS/B6 - Loss of temperature and RH for 8 hourssgpthwapsB6.a1, sgpthwapsB6.b1
D050812.1SGP/THWAPS/B4 - Minor biases in humidity and saturation vapor pressuresgpthwapsB4.b1
D050812.12SGP/THWAPS/C1 - Minor bias in saturation vapor pressuresgpthwapsC1.b1
D050812.4SGP/THWAPS/B5 - Minor biases in humidity and saturation vapor pressuresgpthwapsB5.b1
D050812.7SGP/THWAPS/B6 - Minor biases in humidity and saturation vapor pressuresgpthwapsB6.b1
D050813.2SGP/THWAPS/B1 - Minor bias in saturation vapor pressuresgpthwapsB1.b1


DQRID : D030325.2
Start DateStart TimeEnd DateEnd Time
03/18/2003143003/18/20032205
Subject:
SGP/THWAPS/B6 - Loss of temperature and RH for 8 hours
DataStreams:sgpthwapsB6.a1, sgpthwapsB6.b1
Description:
The UPS for this system failed resulting in loss of power to the HMP233 unit.  As a 
result, the temperature and RH values were read as zero by the data logger.  SiteOps replaced 
the UPS and all appears well now.
Measurements:sgpthwapsB6.a1:
  • 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 Air Temperature(sd_temp)
  • Standard deviation of Relative Humidity(sd_rh)
  • Environmental Temperature (hybrid-b grid)(temp)
sgpthwapsB6.b1:
  • Standard deviation of Vapor Pressure(sd_vap_pres)
  • Environmental Temperature (hybrid-b grid)(temp)
  • Standard Deviation of Air Temperature(sd_temp)
  • Standard Deviation of Pressure(sd_pres)
  • Standard deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Relative humidity scaled, by total column amount from MWR(rh)

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DQRID : D050812.1
Start DateStart TimeEnd DateEnd Time
09/21/1999000007/30/20051722
Subject:
SGP/THWAPS/B4 - Minor biases in humidity and saturation vapor pressure
DataStreams:sgpthwapsB4.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.

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:sgpthwapsB4.b1:
  • Relative humidity scaled, by total column amount from MWR(rh)
  • Vapor Pressure (kiloPascals)(vap_pres)

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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:
  • Vapor Pressure (kiloPascals)(vap_pres)

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DQRID : D050812.4
Start DateStart TimeEnd DateEnd Time
09/21/1999000007/31/20051714
Subject:
SGP/THWAPS/B5 - Minor biases in humidity and saturation vapor pressure
DataStreams:sgpthwapsB5.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.
   
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:sgpthwapsB5.b1:
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Relative humidity scaled, by total column amount from MWR(rh)

Back To Table of Contents

DQRID : D050812.7
Start DateStart TimeEnd DateEnd Time
09/21/1999000007/30/20052355
Subject:
SGP/THWAPS/B6  - Minor biases in humidity and saturation vapor pressure
DataStreams:sgpthwapsB6.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.
   
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:sgpthwapsB6.b1:
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Relative humidity scaled, by total column amount from MWR(rh)

Back To Table of Contents

DQRID : D050813.2
Start DateStart TimeEnd DateEnd Time
09/21/1999000008/01/20052034
Subject:
SGP/THWAPS/B1 - Minor bias in saturation vapor pressure
DataStreams:sgpthwapsB1.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:sgpthwapsB1.b1:
  • Vapor Pressure (kiloPascals)(vap_pres)

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