Data Quality Reports for Session: 179451 User: wblumberg Completed: 09/06/2016

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D050812.1SGP/THWAPS/B4 - Minor biases in humidity and saturation vapor pressuresgpthwapsB4.b1Does not affect quality
D050812.12SGP/THWAPS/C1 - Minor bias in saturation vapor pressuresgpthwapsC1.b1Does not affect quality
D050812.4SGP/THWAPS/B5 - Minor biases in humidity and saturation vapor pressuresgpthwapsB5.b1Does not affect quality
D050812.7SGP/THWAPS/B6 - Minor biases in humidity and saturation vapor pressuresgpthwapsB6.b1Does not affect quality
D050813.2SGP/THWAPS/B1 - Minor bias in saturation vapor pressuresgpthwapsB1.b1Does not affect quality


DQRID : D050812.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/21/1999000007/30/20051722Does not affect quality
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:
  • Pressure, vapor, 25-m height, 1-min intervals(vap_pres)
  • Humidity, relative, at 21-m height, 30-min avg(rh)

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DQRID : D050812.12
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/21/1999000008/10/20051445Does not affect quality
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, 25-m height, 1-min intervals(vap_pres)

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DQRID : D050812.4
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/21/1999000007/31/20051714Does not affect quality
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:
  • Pressure, vapor, 25-m height, 1-min intervals(vap_pres)
  • Humidity, relative, at 21-m height, 30-min avg(rh)

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DQRID : D050812.7
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/21/1999000007/30/20052355Does not affect quality
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:
  • Humidity, relative, at 21-m height, 30-min avg(rh)
  • Pressure, vapor, 25-m height, 1-min intervals(vap_pres)

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DQRID : D050813.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/21/1999000008/01/20052034Does not affect quality
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:
  • Pressure, vapor, 25-m height, 1-min intervals(vap_pres)

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END OF DATA