Data Quality Reports for Session: 109918 User: troyan Completed: 01/15/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D070412.1FKB/MET/M1 - Optical Rain Gauge Data IncorrectfkbmetM1.b1
D070412.2FKB/MET/M1 - ORG Data incorrect during calibrationfkbmetM1.b1
D070417.1FKB/MET/M1 - Optical Rain Gauge Data IncorrectfkbmetM1.b1
D071004.1FKB/SONDE/M1 - RH values may be slightly overcorrected.fkbsondewnpnM1.b1


DQRID : D070412.1
Start DateStart TimeEnd DateEnd Time
03/17/2007000003/17/20070600
04/02/2007000004/02/20070800
04/03/2007030004/03/20070800
04/04/2007230004/05/20070900
04/06/2007010004/06/20070800
04/07/2007000004/07/20070700
04/09/2007000004/09/20070800
04/10/2007000004/10/20070700
04/11/2007000004/11/20070700
Subject:
FKB/MET/M1 - Optical Rain Gauge Data Incorrect
DataStreams:fkbmetM1.b1
Description:
The Optical Raingauge (ORG) data was incorrect during the listed times.  Ice/frost was 
forming on the lenses causing the ORG to believe there was precipitation occurring.
Measurements:fkbmetM1.b1:
  • Precipitation rate standard deviation(precip_rate_sd)
  • Precipitation rate mean(precip_rate_mean)
  • Precipitation rate maximum(precip_rate_max)
  • Precipitation rate minimum(precip_rate_min)

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DQRID : D070412.2
Start DateStart TimeEnd DateEnd Time
04/08/2007073604/08/20070745
Subject:
FKB/MET/M1 - ORG Data incorrect during calibration
DataStreams:fkbmetM1.b1
Description:
The ORG data was incorrect during calibration checks.  The check mimics a precipiation 
event so the precip amounts that were collected were not actually measured.
Measurements:fkbmetM1.b1:
  • Precipitation rate standard deviation(precip_rate_sd)
  • Precipitation rate mean(precip_rate_mean)
  • Precipitation rate maximum(precip_rate_max)
  • Precipitation rate minimum(precip_rate_min)

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DQRID : D070417.1
Start DateStart TimeEnd DateEnd Time
04/05/2007000004/28/20072359
Subject:
FKB/MET/M1 - Optical Rain Gauge Data Incorrect
DataStreams:fkbmetM1.b1
Description:
Precipitation was being reported on days with no rain.  Problems with the grounding and 
the orientation of the receiver facing south (sunlight in the optics) caused erroneous 
readings.
Measurements:fkbmetM1.b1:
  • Precipitation rate standard deviation(precip_rate_sd)
  • Precipitation rate mean(precip_rate_mean)
  • ORG carrier mean(org_carrier_mean)
  • Precipitation rate maximum(precip_rate_max)
  • Precipitation rate minimum(precip_rate_min)

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DQRID : D071004.1
Start DateStart TimeEnd DateEnd Time
09/11/2007043009/19/20070430
Subject:
FKB/SONDE/M1 - RH values may be slightly overcorrected.
DataStreams:fkbsondewnpnM1.b1
Description:
The desiccant in the GC25 ground check set began to lose efficiency at the beginning of 
this time period.  Prior to 9/11/2007 the radiosonde RH readings while in the GC25 (assumed 
RH=0%) were below 1%RH.  The RH readings began to exceed 1%RH on 9/11/2007 and increased 
more or less exponentially to 2.3% RH by the end of 9/18/2007.  The desiccant was 
changed on 9/19/2007 and the radiosonde RH values while in the GC25 again dropped within the 
acceptable limit (< 0.5%RH, in fact).

Because the value obtained from the radiosonde while in the GC25 is subtracted from the 
subsequent RH values as part of the ground check procedure, it is likely that soundings 
done late in this period may be biased low by no more than 2%RH.  The exact amount of the 
correction applied is included in the netCDF header of each file.
Measurements:fkbsondewnpnM1.b1:
  • Relative humidity inside the instrument enclosure(rh)
  • Surface dew point temperature(dp)

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