Data Quality Reports for Session: 120172 User: nickd Completed: 06/10/2009

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D090129.4TWP/SMET/C3 - Reprocess: Station Pressure values reported in hPa instead of kPa.twpsmet60sC3.b1
D090515.1TWP/SMET/C3 - Reprocess: Temperature Biased low by 1.06 Degreestwpsmet60sC3.b1


DQRID : D090129.4
Start DateStart TimeEnd DateEnd Time
01/27/2009185001/30/20091535
Subject:
TWP/SMET/C3 - Reprocess: Station Pressure values reported in hPa instead of kPa.
DataStreams:twpsmet60sC3.b1
Description:
An incorrect program was entered into the datalogger.  This program did not convert the 
station pressure from hPa to kPa.  This made the values larger by a factor of 10 and caused 
the QC bit to be tripped.
Measurements:twpsmet60sC3.b1:
  • Barometric Pressure(atmos_pressure)

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DQRID : D090515.1
Start DateStart TimeEnd DateEnd Time
04/19/2005042004/04/20090115
Subject:
TWP/SMET/C3 - Reprocess: Temperature Biased low by 1.06 Degrees
DataStreams:twpsmet60sC3.b1
Description:
The temperature of the SMET system was biased low by 1.06 Deg C due to a non-precision 
resistor being used int he measurement circuit.  The data will be reprocessed.  Saturation 
Vapor pressure and Vapor pressure will have to be reprocessed also.

Add 1.06 degrees to the temperature data.  

Correct Sat Vap Press using the Buck approximation:
   Es = 6.1121exp((17.502*T)/(240.97 + T) 
where T is the temperature in C.  

Correct Vapor pressure using: E = (RH*Es)/100
Measurements:twpsmet60sC3.b1:
  • Vapor pressure standard deviation(vappress_sd)
  • Mean Air Temperature or Hardware Error(temp_mean)
  • Vapor pressure mean(vappress_mean)
  • Std Dev of Air Temperature(temp_sd)

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