Data Quality Reports for Session: 122662 User: vghate Completed: 09/14/2009

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060113.1TWP/VCEIL/C3 - low receiver sensitivitytwpvceil25kC3.b1
D060629.1TWP/MMCR/C3 - Diminished Reflectivity SensitivitytwpmmcrmomC3.b1, twpmmcrspecmomC3.a0
D061220.35TWP/ARSCL/C3 - Reprocess: ARSCL CloudBasePrecipitation field incorrecttwparscl1clothC3.c1, twparsclcbh1clothC3.c1, twpmmcrmode1bl200511041clothC3.c1,
twpmmcrmode2ci200511041clothC3.c1, twpmmcrmode3ge200511041clothC3.c1,
twpmmcrmode4pr200511041clothC3.c1
D070112.3TWP/MMCR/C3 - Reprocess: Height ErrortwpmmcrmomC3.00, twpmmcrmomC3.b1, twpmmcrspecmomC3.a0
D070504.1TWP/ARSCL/C3 - Reprocess: MMCR Height offset affects ARSCL cloud boundariestwparscl1clothC3.c1, twparsclbnd1clothC3.c1, twpmmcrmode1bl200511041clothC3.c1,
twpmmcrmode2ci200511041clothC3.c1, twpmmcrmode3ge200511041clothC3.c1,
twpmmcrmode4pr200511041clothC3.c1


DQRID : D060113.1
Start DateStart TimeEnd DateEnd Time
12/12/2005055505/18/20062300
Subject:
TWP/VCEIL/C3 - low receiver sensitivity
DataStreams:twpvceil25kC3.b1
Description:
The ceilometer reported frequent receiver alarms. There are periods when the receiver 
sensitivity dropped to about 50%. The problem was corrected by replacing the instrument with 
a spare.
Measurements:twpvceil25kC3.b1:
  • Lowest cloud base height detected.(first_cbh)
  • Vertical visibility(vertical_visibility)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Backscatter sum(sum_backscatter)
  • Second lowest cloud base height(second_cbh)
  • Third cloud base height(third_cbh)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Altitude of highest signal(alt_highest_signal)
  • Millivolts at internal ADC input (0 to 2500)(background_light)

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DQRID : D060629.1
Start DateStart TimeEnd DateEnd Time
12/02/2005000007/18/20062359
Subject:
TWP/MMCR/C3 - Diminished Reflectivity Sensitivity
DataStreams:twpmmcrmomC3.b1, twpmmcrspecmomC3.a0
Description:
Radar sensitivity was diminished by approximately 15 - 20 dBZ during
this period.  The result is that upper level cloud tops may be missed
and thin clouds, particularly thin cirrus, may not be detected during
this period.  Reflectivity was correctly calibrated, so values are
correct where signals were detected.  The problem was caused by
lightning damage to the low noise amplifier (LNA).  The LNA was replaced
on 20060718.
Measurements:twpmmcrspecmomC3.a0:
  • First Order Estimate of Spectral Count Calibration(CalibrationConstant)
  • Radar Constant(RadarConstant)
  • Receiver Gain(RxGain)
  • Receiver Sky Noise(SkyNoiseLevel)
  • Minimum detectable reflectivity(MinimumDetectableReflectivity)
  • Receiver 290K Level(Rx290KLevel)
  • Receiver Cal Check Level(CalCheckLevel)
twpmmcrmomC3.b1:
  • Receiver Sky Noise(SkyNoiseLevel)
  • Receiver Cal Check Level(CalCheckLevel)
  • Minimum detectable reflectivity(MinimumDetectableReflectivity)
  • Range Corrected Calibrated Power(RangeCorrectedPower)
  • Receiver 290K Level(Rx290KLevel)
  • MMCR Reflectivity(Reflectivity)
  • Radar Constant(RadarConstant)
  • Receiver Gain(RxGain)

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DQRID : D061220.35
Start DateStart TimeEnd DateEnd Time
11/04/2005000003/31/20062359
Subject:
TWP/ARSCL/C3 - Reprocess: ARSCL CloudBasePrecipitation field incorrect
DataStreams:twparscl1clothC3.c1, twparsclcbh1clothC3.c1, twpmmcrmode1bl200511041clothC3.c1,
twpmmcrmode2ci200511041clothC3.c1, twpmmcrmode3ge200511041clothC3.c1,
twpmmcrmode4pr200511041clothC3.c1
Description:
The CloudBasePrecipitation field is incorrect and has no physical meaning.  An ARSCL 
processing error occurred when the smet60s data stream format changed, causing the wrong data 
field to be used to supply precipitation measurements to the ARSCL VAP.  The error caused 
no significant degradation in other ARSCL fields, since manual quality control corrected 
any related errors.
Measurements:twparsclcbh1clothC3.c1:
  • Microwave Radiometer Wet Window/Optical Rain Gauge Cloud Base Height(CloudBasePrecipitation)
twpmmcrmode4pr200511041clothC3.c1:
  • Microwave Radiometer Wet Window/Optical Rain Gauge Cloud Base Height(CloudBasePrecipitation)
twpmmcrmode2ci200511041clothC3.c1:
  • Microwave Radiometer Wet Window/Optical Rain Gauge Cloud Base Height(CloudBasePrecipitation)
twpmmcrmode3ge200511041clothC3.c1:
  • Microwave Radiometer Wet Window/Optical Rain Gauge Cloud Base Height(CloudBasePrecipitation)
twparscl1clothC3.c1:
  • Microwave Radiometer Wet Window/Optical Rain Gauge Cloud Base Height(CloudBasePrecipitation)
twpmmcrmode1bl200511041clothC3.c1:
  • Microwave Radiometer Wet Window/Optical Rain Gauge Cloud Base Height(CloudBasePrecipitation)

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DQRID : D070112.3
Start DateStart TimeEnd DateEnd Time
11/04/2005050001/10/20072000
Subject:
TWP/MMCR/C3 - Reprocess:   Height Error
DataStreams:twpmmcrmomC3.00, twpmmcrmomC3.b1, twpmmcrspecmomC3.a0
Description:
A timing error was found in the PIRAQ MMCR's.  It resulted in recorded heights being too 
high for each radar mode by the following amounts: 
   Mode 1: 24.8756 m too high
   Mode 2: 25.6249 m too high
   Mode 3: 33.1176 m too high
   Mode 4: 33.1176 m too high
Range gate spacing was not affected.
Measurements:twpmmcrspecmomC3.a0:
  • Height of Center of Each Range Bin(Heights)
twpmmcrmomC3.00:
  • Raw data stream - documentation not supported(raw)
twpmmcrmomC3.b1:
  • Array of heights for each power(heights)

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DQRID : D070504.1
Start DateStart TimeEnd DateEnd Time
11/04/2005000005/31/20062359
Subject:
TWP/ARSCL/C3 - Reprocess: MMCR Height offset affects ARSCL cloud boundaries
DataStreams:twparscl1clothC3.c1, twparsclbnd1clothC3.c1, twpmmcrmode1bl200511041clothC3.c1,
twpmmcrmode2ci200511041clothC3.c1, twpmmcrmode3ge200511041clothC3.c1,
twpmmcrmode4pr200511041clothC3.c1
Description:
MMCR heights were recorded as being too high by the following amounts:
   Mode 1: 24.8756 m too high
   Mode 2: 25.6249 m too high
   Mode 3: 33.1176 m too high
   Mode 4: 33.1176 m too high

These errors may affect cloud boundaries that are determined by combining MMCR and MPL 
measurements;  radar moments heights will be off by these amounts also.

NOTE: reprocessing is underway.  20060101-20060228 have been reprocessed and archived.  
These data cover the period of TWP-ICE.
Measurements:twpmmcrmode2ci200511041clothC3.c1:
  • Height of Center of Each Range Bin(Heights)
twparsclbnd1clothC3.c1:
  • Bottom Height of Hydrometeor Layer from Composite (MMCR/Campbell et al. MPL)
    Algorithms(CloudLayerBottomHeightMplCamp)
  • Top Height of Hydrometeor Layer from Composite (MMCR/Clothiaux et al. MPL)
    Algorithms(CloudLayerTopHeightMplCloth)
  • Bottom Height of Hydrometeor Layer from Composite (MMCR/Clothiaux et al. MPL)
    Algorithms(CloudLayerBottomHeightMplCloth)
  • Top Height of Hydrometeor Layer from Composite (MMCR/Campbell et al. MPL)
    Algorithms(CloudLayerTopHeightMplCamp)
twpmmcrmode4pr200511041clothC3.c1:
  • Height of Center of Each Range Bin(Heights)
twpmmcrmode3ge200511041clothC3.c1:
  • Height of Center of Each Range Bin(Heights)
twparscl1clothC3.c1:
  • Height of Center of Each Range Bin(Heights)
  • Bottom Height of Hydrometeor Layer from Composite (MMCR/Clothiaux et al. MPL)
    Algorithms(CloudLayerBottomHeightMplCloth)
  • Top Height of Hydrometeor Layer from Composite (MMCR/Clothiaux et al. MPL)
    Algorithms(CloudLayerTopHeightMplCloth)
  • Top Height of Hydrometeor Layer from Composite (MMCR/Campbell et al. MPL)
    Algorithms(CloudLayerTopHeightMplCamp)
  • Bottom Height of Hydrometeor Layer from Composite (MMCR/Campbell et al. MPL)
    Algorithms(CloudLayerBottomHeightMplCamp)
twpmmcrmode1bl200511041clothC3.c1:
  • Height of Center of Each Range Bin(Heights)

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