Data Quality Reports for Session: 141490 User: yann1blan1 Completed: 03/30/2012

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D090728.2NSA/ARSCL/C1 - Reflectivity values unreliablensaarscl1clothC1.c1, nsaarsclbnd1clothC1.c1, nsammcrmode1bl200712011clothC1.c1,
nsammcrmode2ci200712011clothC1.c1, nsammcrmode3ge200712011clothC1.c1,
nsammcrmode4ro200712011clothC1.c1
D110803.1NSA/ARSCL/C1 - Reflectivity too highnsaarscl1clothC1.c1, nsammcrmode1bl200712011clothC1.c1, nsammcrmode2ci200712011clothC1.c1,
nsammcrmode3ge200712011clothC1.c1, nsammcrmode4ro200712011clothC1.c1


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 : D110803.1
Start DateStart TimeEnd DateEnd Time
01/10/2010000001/18/20101830
02/10/2010000002/23/20100230
Subject:
NSA/ARSCL/C1 - Reflectivity too high
DataStreams:nsaarscl1clothC1.c1, nsammcrmode1bl200712011clothC1.c1, nsammcrmode2ci200712011clothC1.c1,
nsammcrmode3ge200712011clothC1.c1, nsammcrmode4ro200712011clothC1.c1
Description:
The calibration of the MMCR was incorrect during this period, causing large positive 
shifts in reported reflectivity values.  As a result, the reflectivies reported by ARSCL are 
also too high.  However, other radar moments (MeanDopplerVelocity and SpectralWidth) and 
cloud boundaries reported in ARSCL data files are not affected and can be used.

Do not use ReflectivityBestEstimate, Reflectivity, or ReflectivityNoClutter values during 
this period.
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)
nsaarscl1clothC1.c1:
  • MMCR Reflectivity, Best estimate, Hydrometer(ReflectivityBestEstimate)
  • Cloud, reflectivity, at altitude(Reflectivity)
  • MMCR Reflectivity, clutter removed(ReflectivityNoClutter)

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