Data Quality Reports for Session: 113789 User: gaustad Completed: 08/22/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D030117.21SGP/VCEIL/B5 - REPROCESS: CBH reported in feet but labeled meterssgpvceil25kB5.a1, sgpvceil25kB5.b1
D050406.2SGP/VCEIL/B5 - Noisy Backscattersgpvceil25kB5.b1
D051005.3SGP/VCEIL/B5 - Backscatter noise affects cloud detectionsgpvceil25kB5.b1


DQRID : D030117.21
Start DateStart TimeEnd DateEnd Time
05/27/2001000012/13/20010013
Subject:
SGP/VCEIL/B5 - REPROCESS: CBH reported in feet but labeled meters
DataStreams:sgpvceil25kB5.a1, sgpvceil25kB5.b1
Description:
The cloud base heights reported in the file are in feet despite being labelled meters.  
Reprocessing of this data is highly recommended.

The first affected file is from 2001-05-27 when the ceilometer was exchanged with a 
repaired one.  The last affected file is on 2001-12-13 when the new vceil_ingest version 7.2 
was released which applies the proper units conversion from feet to meters.
Measurements:sgpvceil25kB5.b1:
  • Vertical visibility(vertical_visibility)
  • Lowest cloud base height detected.(first_cbh)
  • Dummy altitude for Zeb(alt)
  • Third cloud base height(third_cbh)
  • Second lowest cloud base height(second_cbh)
  • Altitude of highest signal(alt_highest_signal)
sgpvceil25kB5.a1:
  • Second lowest cloud base height(second_cbh)
  • Vertical visibility(vertical_visibility)
  • Altitude of highest signal(alt_highest_signal)
  • Dummy altitude for Zeb(alt)
  • Third cloud base height(third_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • Lowest cloud base height detected.(lowest_cloud_base_ht)

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DQRID : D050406.2
Start DateStart TimeEnd DateEnd Time
10/19/2004133004/13/20052359
Subject:
SGP/VCEIL/B5 - Noisy Backscatter
DataStreams:sgpvceil25kB5.b1
Description:
Since October of 2004, the noise in the backscatter plots occasionally become high in 
amplitude for periods of time lasting anywhere from an hour or so to as much as a day. This 
problem appears similar to a dirty window (such as the problem at B6 last week), but the 
fact that the plots show high amplitude for short durations of time imply that this 
problem is different.

Cloud base height detection appears to be unaffected.
Measurements:sgpvceil25kB5.b1:
  • Aerosol backscatter coefficient at 355 nm(backscatter)

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DQRID : D051005.3
Start DateStart TimeEnd DateEnd Time
04/14/2005000007/14/20052359
Subject:
SGP/VCEIL/B5 - Backscatter noise affects cloud detection
DataStreams:sgpvceil25kB5.b1
Description:
Performance of the instrument degraded resulting in very noisy backscatter data to the 
extent that cloud detection was severely impacted beyond approximately 3 km (day and night).
Measurements:sgpvceil25kB5.b1:
  • Second lowest cloud base height(second_cbh)
  • Third cloud base height(third_cbh)
  • Vertical visibility(vertical_visibility)
  • Aerosol backscatter coefficient at 355 nm(backscatter)
  • Altitude of highest signal(alt_highest_signal)
  • Lowest cloud base height detected.(first_cbh)

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