Data Quality Reports for Session: 101243 User: gaustad Completed: 08/22/2006


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040428.1TWP/SMET/C1 - Poor Performing Sensortwpsmet60sC1.b1
D040824.3TWP/SMET/C1 - Incorrect rainrate equation usedtwpsmet60sC1.b1
D050601.4TWP/SMET/C1 - Reprocess: Incorrect Units Listed for Vapor Pressuretwpsmet60sC1.b1


DQRID : D040428.1
Start DateStart TimeEnd DateEnd Time
04/23/2004000001/19/20051530
Subject:
TWP/SMET/C1 - Poor Performing Sensor
DataStreams:twpsmet60sC1.b1
Description:
On 4/23/2004 condensation was found inside the target area of the ORG lens. A spare was 
sent and installed but did not solve the problem of high background voltage values causing 
rainrate values to be recorded during no rainfall.  Values range anywhere from 0.06 to 
0.12 mm/hr.  

A new Optical Rain Gage was installed on 01/19/2005 @ 13:30 GMT alleviating the high 
background voltage values that lead to consistent rainfall rates of around 0.11 to 0.15 mm/hr 
on a consistent basis.  

The formula used to calculate rainfall rates from the new Optical Rain Gage is:  RR 
(mm/hr) = 25(V^1.87) - 0.15.

Older model formula = 20(V^2) - 0.05

The two formulas result in comparable data.
Measurements:twpsmet60sC1.b1:
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • precipitation minimum(precip_min)


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DQRID : D040824.3
Start DateStart TimeEnd DateEnd Time
08/03/2004030708/17/20042138
Subject:
TWP/SMET/C1 - Incorrect rainrate equation used
DataStreams:twpsmet60sC1.b1
Description:
There are two different Optical Raingages in use at the TWP sites.  The incorrect equation 
was used at this site.  The incorrect equation is (25*(V^1.87)) - 0.15.
The correct equation is (20*(V^2)) - 0.05.  The correct equation was installed.
Measurements:twpsmet60sC1.b1:
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • precipitation minimum(precip_min)


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DQRID : D050601.4
Start DateStart TimeEnd DateEnd Time
08/03/2004000005/19/20052359
Subject:
TWP/SMET/C1 - Reprocess: Incorrect Units Listed for Vapor Pressure
DataStreams:twpsmet60sC1.b1
Description:
The netcdf file header incorrectly listed the units of Vapor Pressure as hPa when in fact 
they were kPa.
Measurements:twpsmet60sC1.b1:
  • Vapor pressure mean(vappress_mean)
  • Vapor pressure standard deviation(vappress_sd)


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