Data Quality Reports for Session: 113335 User: kwalter Completed: 07/23/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D020313.1SGP/THWAPS/C1 - THWAPS C1 miscalibratedsgpthwapsC1.a1, sgpthwapsC1.b1
D030917.21SGP/THWAPS/B1/B5/B6/C1 - Missing data due to Ice storm and clock problemssgpthwapsB1.00, sgpthwapsB1.a1, sgpthwapsB1.b1, sgpthwapsB5.00, sgpthwapsB5.a1,
sgpthwapsB5.b1, sgpthwapsB6.00, sgpthwapsB6.a1, sgpthwapsB6.b1, sgpthwapsC1.00, sgpthwapsC1.a1,
sgpthwapsC1.b1
D041123.1SGP/THWAPS/C1 - RH Sensor CalibrationsgpthwapsC1.b1
D050812.10SGP/THWAPS/C1 - Minor bias in humiditysgpthwapsC1.a1, sgpthwapsC1.b1
D050812.12SGP/THWAPS/C1 - Minor bias in saturation vapor pressuresgpthwapsC1.b1
D080116.24SGP/THWAPS/C1 - RH Data IncorrectsgpthwapsC1.b1
D991008.1SGP/THWAPS - RH values low by factor of 1.1DsgpthwapsC1.a1, DsgpthwapsC1.b1, sgpthwapsC1.00, sgpthwapsC1.a1, sgpthwapsC1.b1


DQRID : D020313.1
Start DateStart TimeEnd DateEnd Time
03/09/2002034004/23/20021418
Subject:
SGP/THWAPS/C1 - THWAPS C1 miscalibrated
DataStreams:sgpthwapsC1.a1, sgpthwapsC1.b1
Description:
Power outages apparently led to the THWAPS HMP233 temperature and RH sensor
being replaced at C1.  The power went out at 0340 on 3/9 was restored at
0635 and went out again at 2025.

The new HMP233 appears to be incorrectly calibrated and all temperature
data since its installation are wrong.  If I am correct about the nature
of the calibration problem, the true average temperature can be recovered
from that recorded by a linear conversion, but I don't think its worth the
trouble.
Measurements:sgpthwapsC1.a1:
  • Standard Deviation of Air Temperature(sd_temp)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Beam 0 Temperature(temp)
  • Relative humidity inside the instrument enclosure(rh)
sgpthwapsC1.b1:
  • Beam 0 Temperature(temp)
  • Relative humidity inside the instrument enclosure(rh)
  • Standard Deviation of Air Temperature(sd_temp)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)

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DQRID : D030917.21
Start DateStart TimeEnd DateEnd Time
03/09/2002205503/11/20022005
03/13/2002175503/14/20021505
Subject:
SGP/THWAPS/B1/B5/B6/C1 - Missing data due to Ice storm and clock problems
DataStreams:sgpthwapsB1.00, sgpthwapsB1.a1, sgpthwapsB1.b1, sgpthwapsB5.00, sgpthwapsB5.a1,
sgpthwapsB5.b1, sgpthwapsB6.00, sgpthwapsB6.a1, sgpthwapsB6.b1, sgpthwapsC1.00, sgpthwapsC1.a1,
sgpthwapsC1.b1
Description:
Data are missing due to power failures caused by an ice storm
and resulting system/instrument clock problems.
Measurements:sgpthwapsC1.a1:
  • Standard Deviation of Relative Humidity(sd_rh)
  • Unit Vector Wind Direction(wdir)
  • lat(lat)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Relative humidity inside the instrument enclosure(rh)
  • Time offset of tweaks from base_time(time_offset)
  • Mean Wind Speed(wspd)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Beam 0 Temperature(temp)
  • Standard Deviation of Air Temperature(sd_temp)
  • base time(base_time)
  • Standard Deviation of Wind Direction(sd_wdir)
  • lon(lon)
  • Standard Deviation of Pressure(sd_pres)
  • Retrieved pressure profile(pres)
  • Batter Voltage(vbat)
  • Dummy altitude for Zeb(alt)
sgpthwapsB1.b1:
  • Retrieved pressure profile(pres)
  • lat(lat)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Standard Deviation of Air Temperature(sd_temp)
  • Batter Voltage(vbat)
  • Unit Vector Wind Direction(wdir)
  • Beam 0 Temperature(temp)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Time offset of tweaks from base_time(time_offset)
  • Standard Deviation of Pressure(sd_pres)
  • Relative humidity inside the instrument enclosure(rh)
  • Mean Wind Speed(wspd)
  • Standard Deviation of Wind Direction(sd_wdir)
  • lon(lon)
  • base time(base_time)
  • Dummy altitude for Zeb(alt)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
sgpthwapsB5.00:
  • null(Raw data stream - documentation not supported)
sgpthwapsB6.00:
  • null(Raw data stream - documentation not supported)
sgpthwapsB6.a1:
  • lon(lon)
  • Batter Voltage(vbat)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Standard Deviation of Wind Direction(sd_wdir)
  • Mean Wind Speed(wspd)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Relative humidity inside the instrument enclosure(rh)
  • Time offset of tweaks from base_time(time_offset)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • lat(lat)
  • Retrieved pressure profile(pres)
  • Unit Vector Wind Direction(wdir)
  • base time(base_time)
  • Dummy altitude for Zeb(alt)
  • Beam 0 Temperature(temp)
  • Standard Deviation of Pressure(sd_pres)
  • Standard Deviation of Air Temperature(sd_temp)
sgpthwapsB5.b1:
  • Relative humidity inside the instrument enclosure(rh)
  • Standard Deviation of Air Temperature(sd_temp)
  • Batter Voltage(vbat)
  • lon(lon)
  • Mean Wind Speed(wspd)
  • Time offset of tweaks from base_time(time_offset)
  • base time(base_time)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Retrieved pressure profile(pres)
  • lat(lat)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Standard Deviation of Wind Direction(sd_wdir)
  • Standard Deviation of Pressure(sd_pres)
  • Unit Vector Wind Direction(wdir)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Beam 0 Temperature(temp)
  • Dummy altitude for Zeb(alt)
sgpthwapsC1.00:
  • null(Raw data stream - documentation not supported)
sgpthwapsB1.a1:
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Relative humidity inside the instrument enclosure(rh)
  • Standard Deviation of Wind Direction(sd_wdir)
  • Batter Voltage(vbat)
  • lon(lon)
  • Time offset of tweaks from base_time(time_offset)
  • lat(lat)
  • Beam 0 Temperature(temp)
  • Mean Wind Speed(wspd)
  • Standard Deviation of Pressure(sd_pres)
  • Standard Deviation of Relative Humidity(sd_rh)
  • base time(base_time)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Standard Deviation of Air Temperature(sd_temp)
  • Retrieved pressure profile(pres)
  • Dummy altitude for Zeb(alt)
  • Unit Vector Wind Direction(wdir)
sgpthwapsC1.b1:
  • lon(lon)
  • Retrieved pressure profile(pres)
  • Batter Voltage(vbat)
  • Beam 0 Temperature(temp)
  • Time offset of tweaks from base_time(time_offset)
  • lat(lat)
  • Dummy altitude for Zeb(alt)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Standard Deviation of Air Temperature(sd_temp)
  • Standard Deviation of Wind Direction(sd_wdir)
  • Unit Vector Wind Direction(wdir)
  • base time(base_time)
  • Relative humidity inside the instrument enclosure(rh)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Standard Deviation of Pressure(sd_pres)
  • Mean Wind Speed(wspd)
sgpthwapsB1.00:
  • null(Raw data stream - documentation not supported)
sgpthwapsB6.b1:
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Batter Voltage(vbat)
  • lat(lat)
  • Standard Deviation of Pressure(sd_pres)
  • Standard Deviation of Air Temperature(sd_temp)
  • Time offset of tweaks from base_time(time_offset)
  • Standard Deviation of Wind Direction(sd_wdir)
  • Relative humidity inside the instrument enclosure(rh)
  • Beam 0 Temperature(temp)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Unit Vector Wind Direction(wdir)
  • Retrieved pressure profile(pres)
  • Dummy altitude for Zeb(alt)
  • base time(base_time)
  • Mean Wind Speed(wspd)
  • Standard Deviation of Relative Humidity(sd_rh)
  • lon(lon)
sgpthwapsB5.a1:
  • Unit Vector Wind Direction(wdir)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • base time(base_time)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Batter Voltage(vbat)
  • Relative humidity inside the instrument enclosure(rh)
  • lat(lat)
  • Dummy altitude for Zeb(alt)
  • Standard Deviation of Air Temperature(sd_temp)
  • Standard Deviation of Pressure(sd_pres)
  • lon(lon)
  • Time offset of tweaks from base_time(time_offset)
  • Standard Deviation of Wind Direction(sd_wdir)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Mean Wind Speed(wspd)
  • Retrieved pressure profile(pres)
  • Beam 0 Temperature(temp)

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DQRID : D041123.1
Start DateStart TimeEnd DateEnd Time
11/16/2004213511/29/20041930
Subject:
SGP/THWAPS/C1 - RH Sensor Calibration
DataStreams:sgpthwapsC1.b1
Description:
The analog output for the T/RH probe was incorrectly calibrated.  This
caused excessively high readings of RH.
Measurements:sgpthwapsC1.b1:
  • Relative humidity inside the instrument enclosure(rh)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)

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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.a1:
  • Relative humidity inside the instrument enclosure(rh)
sgpthwapsC1.b1:
  • Relative humidity inside the instrument enclosure(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:
  • Vapor Pressure (kiloPascals)(vap_pres)

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DQRID : D080116.24
Start DateStart TimeEnd DateEnd Time
12/22/2007175012/22/20072130
Subject:
SGP/THWAPS/C1 - RH Data Incorrect
DataStreams:sgpthwapsC1.b1
Description:
The RH data was incorrect during the times listed.  Reason unknown.  The sensor recovered 
on its own.
Measurements:sgpthwapsC1.b1:
  • Relative humidity inside the instrument enclosure(rh)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)

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DQRID : D991008.1
Start DateStart TimeEnd DateEnd Time
09/27/1999144510/14/19992230
Subject:
SGP/THWAPS - RH values low by factor of 1.1
DataStreams:DsgpthwapsC1.a1, DsgpthwapsC1.b1, sgpthwapsC1.00, sgpthwapsC1.a1, sgpthwapsC1.b1
Description:
Because of instrument mentor stupidity, all C1 THWAPS RH data collected
from the begin date of this DQR are low by a factor of 1.1.  This error
also will affect the vapor pressure data.  The problem is that the CSI
data logger is expecting the data to be scaled 0-100%RH on the range 0-1V,
but it is now being scaled 0-110%RH on the range 0-1V.
Measurements:sgpthwapsC1.a1:
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)
  • Relative humidity inside the instrument enclosure(rh)
DsgpthwapsC1.b1:
  • (Development data stream - documentation not supported)
sgpthwapsC1.00:
  • null(Raw data stream - documentation not supported)
sgpthwapsC1.b1:
  • Relative humidity inside the instrument enclosure(rh)
  • Standard Deviation of Vapor Pressure(sd_vap_pres)
  • Standard Deviation of Relative Humidity(sd_rh)
  • Vapor Pressure (kiloPascals)(vap_pres)
DsgpthwapsC1.a1:
  • (Development data stream - documentation not supported)

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END OF DATA