Data Quality Reports for Session: 145716 User: ql_data Completed: 11/01/2012

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


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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