Data Quality Reports for Session: 147296 User: bsyin1 Completed: 01/23/2013

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D020927.1SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivitiessgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1
D050222.2SGP/MMCR/C1 - Power supply failuresgpmmcrmomC1.00, sgpmmcrmomC1.b1, sgpmmcrspectraC1.a0, sgparscl1clothC1.c1,
sgparsclbnd1clothC1.c1
D090728.2NSA/ARSCL/C1 - Reflectivity values unreliablensaarscl1clothC1.c1, nsaarsclbnd1clothC1.c1, nsammcrmode1bl200712011clothC1.c1,
nsammcrmode2ci200712011clothC1.c1, nsammcrmode3ge200712011clothC1.c1,
nsammcrmode4ro200712011clothC1.c1
D100519.1SGP/ARSCL/C1 - Ceilometer not used during processingsgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1


DQRID : D020927.1
Start DateStart TimeEnd DateEnd Time
12/01/1996000002/04/20002359
Subject:
SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities
DataStreams:sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1
Description:
Prior to February 4, 2000, the ARSCL data set incorporated data from the
Beaufort Laser Ceilometer as one of its inputs.  Because of the BLC's
high spatial resolution, this data was often chosen by ARSCL as the
"CloudBaseBestEstimate" for boundary layer clouds. It was subsequently
determined that the BLC cloud base was biased, with the BLC reporting
cloud base heights that are 122 meters too high.

The bias error will be corrected when the entire ARSCL data set is
reprocessed as part of release_4.  (The release version number is included
the the netCDF global comments).   This reprocessing will also include a
small correction the the MMCR near-field reflectivities.  This correction
is less than 1 dB except for hydrometers within 200 meters of the surface.

Thanks to Roger Marchand for helping bracket this problem.
Measurements:sgparsclbnd1clothC1.c1:
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)
sgparscl1clothC1.c1:
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
  • Cloud, reflectivity, at altitude(Reflectivity)
  • MMCR Reflectivity, Best estimate, Hydrometer(ReflectivityBestEstimate)
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)
sgparsclcbh1clothC1.c1:
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)

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DQRID : D050222.2
Start DateStart TimeEnd DateEnd Time
01/16/2005003002/11/20052115
Subject:
SGP/MMCR/C1 - Power supply failure
DataStreams:sgpmmcrmomC1.00, sgpmmcrmomC1.b1, sgpmmcrspectraC1.a0, sgparscl1clothC1.c1,
sgparsclbnd1clothC1.c1
Description:
A power supply failed in the MMCR's receiver.  During the period of this DQR, the radar 
would appear to work but the calibration is probably incoorect during good portions of this 
time.  The power supply was replaced and normal operation resumed at 2115 on 02/11/2005.
Measurements:sgparsclbnd1clothC1.c1:
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)
  • CloudLayerBottomHeightMplCloth
  • CloudLayerBottomHeightMplCamp
  • time_offset
  • CloudLayerTopHeightMplCloth
  • CloudLayerTopHeightMplCamp
  • base_time
sgparscl1clothC1.c1:
  • MMCR Reflectivity, clutter removed(ReflectivityNoClutter)
  • SignaltoNoiseRatio
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)
  • base_time
  • CloudBasePrecipitation
  • ModeId
  • MPL Scott Algorithm Cloud Base Height(CloudBaseMplScott)
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
  • Cloud, reflectivity, at altitude(Reflectivity)
  • RadarFirstTop
  • MPL Cloth et al. Algorithm Cloud Mask(CloudMaskMplCloth)
  • time_offset
  • MMCR Reflectivity, Best estimate, Hydrometer(ReflectivityBestEstimate)
  • MPL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseMplCloth)
  • Heights
  • CloudLayerTopHeightMplCloth
  • CloudLayerBottomHeightMplCamp
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • MPL Campbell et al. Algorithm Cloud Base Height(CloudBaseMplCamp)
  • MMCR Spectral Width(SpectralWidth)
  • CloudLayerBottomHeightMplCloth
  • CloudLayerTopHeightMplCamp
  • Cloud Mask Occurrence, MPL Campbell et al. algorithm(CloudMaskMplCamp)
sgpmmcrspectraC1.a0:
  • base_time
  • lat
  • Cloud, doppler spectrum, at altitude, 8-mm radar(Spectra)
  • GateSpacing
  • NumSpectraAveraged
  • Delay
  • PulseWidth
  • time_offset
  • Switch
  • NumCodeBits
  • NumFft
  • alt
  • InterPulsePeriod
  • StartGateDelay
  • NumCoherentIntegrations
  • NumHeights
  • Heights
  • lon
sgpmmcrmomC1.00:
  • AVHRR satellite images for Darwin from BOM (RAW)(raw)
sgpmmcrmomC1.b1:
  • lat
  • SignalToNoiseRatio
  • RadarConstant
  • GateSpacing
  • RxCalTimeStamp
  • TimeAvg
  • NumHeights
  • PeakTransmittedPowerAvg
  • DataQualityStatus
  • ModeNum
  • ModeDescription
  • SkyNoiseLevel
  • CalCheckTime
  • time_offset
  • heights
  • Power
  • RangeCorrectedPower
  • NoiseLevel
  • AvgNoiseLevel
  • CalCheckLevel
  • alt
  • Cloud, reflectivity, at altitude(Reflectivity)
  • NumReceivers
  • MinimumDetectableReflectivity
  • NumCodeBits
  • NumCoherentIntegrations
  • TWTStatusCode
  • MMCR Spectral Width(SpectralWidth)
  • lon
  • CircularDepolarizationRatio
  • time
  • NumFFT
  • ReceiverNumber
  • NumSpectralAverages
  • ClutterHeight
  • base_time
  • PulseWidth
  • RxGain
  • InterPulsePeriod
  • DCFilterONOFF
  • ReceiverMode
  • StartGateDelay
  • Rx290KLevel
  • NyquistVelocity
  • MMCR Mean Doppler Velocity(MeanDopplerVelocity)
  • WindowingONOFF

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DQRID : D090728.2
Start DateStart TimeEnd DateEnd Time
12/01/2007000002/13/20082359
Subject:
NSA/ARSCL/C1 - Reflectivity values unreliable
DataStreams:nsaarscl1clothC1.c1, nsaarsclbnd1clothC1.c1, nsammcrmode1bl200712011clothC1.c1,
nsammcrmode2ci200712011clothC1.c1, nsammcrmode3ge200712011clothC1.c1,
nsammcrmode4ro200712011clothC1.c1
Description:
Reflectivity dBZ values should not be used.  The reported cloud boundaries may 
underestimate cloud tops, particularly for high or thick clouds.  Also thin high clouds may have 
been missed entirely, especially if there were lower-level cloud layers below them. During 
this time period, the MMCR was transmitting in  circular polarization, rather than 
(correct) linear polarization. This caused reported Reflectivity values to be too low by an 
unknown amount, resulting in an effective loss of radar sensitivity.

Areas identified as have having hydrometeor detections are correct, however some areas 
marked as clear may in fact contain cloud due to the MMCR's low sensitivity during this time.
Measurements:nsammcrmode4ro200712011clothC1.c1:
  • Cloud, reflectivity, at altitude(Reflectivity)
nsammcrmode3ge200712011clothC1.c1:
  • Cloud, reflectivity, at altitude(Reflectivity)
nsammcrmode1bl200712011clothC1.c1:
  • Cloud, reflectivity, at altitude(Reflectivity)
nsammcrmode2ci200712011clothC1.c1:
  • Cloud, reflectivity, at altitude(Reflectivity)
nsaarsclbnd1clothC1.c1:
  • CloudLayerBottomHeightMplCloth
  • CloudLayerTopHeightMplCloth
nsaarscl1clothC1.c1:
  • CloudLayerTopHeightMplCloth
  • MMCR Reflectivity, Best estimate, Hydrometer(ReflectivityBestEstimate)
  • RadarFirstTop
  • Cloud, reflectivity, at altitude(Reflectivity)
  • MMCR Reflectivity, clutter removed(ReflectivityNoClutter)
  • CloudLayerBottomHeightMplCloth

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DQRID : D100519.1
Start DateStart TimeEnd DateEnd Time
11/20/2009000012/31/20092359
Subject:
SGP/ARSCL/C1 - Ceilometer not used during processing
DataStreams:sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1
Description:
The ceilometer was not used during processing due to a ceilometer data format change that 
ARSCL did not handle properly.  As a result, cloud boundaries in the lowest several 
kilometers may be less accurate than usual, as they are based solely on the micropulse lidar 
and millimeter cloud radar.
Measurements:sgparsclbnd1clothC1.c1:
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)
sgparscl1clothC1.c1:
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)
sgparsclcbh1clothC1.c1:
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)

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