Data Quality Reports for Session: 141772 User: zhenyuhan Completed: 04/07/2012

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060113.1TWP/VCEIL/C3 - low receiver sensitivitytwpvceil25kC3.b1
D100215.6TWP/VCEIL/C3 - Reprocess: Incorrect serial_number and sum_backscatter fieldstwpvceil25kC3.b1


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:
  • receiver_sensitivity
  • Backscatter(backscatter)
  • sum_backscatter
  • Second lowest cloud base height(second_cbh)
  • Third cloud base height(third_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • background_light
  • alt_highest_signal
  • Vertical visibility(vertical_visibility)

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DQRID : D100215.6
Start DateStart TimeEnd DateEnd Time
02/27/2002000010/31/20092359
Subject:
TWP/VCEIL/C3 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:twpvceil25kC3.b1
Description:
Attribute serial_number: In most cases, this field is not representative of the actual 
serial number of the instrument because the value did not change when an instrument changed 
locations or was replaced with a spare.
   
Variable sum_backscatter: An out-of-range condition for the "sum of detected and 
normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 
0.0999 /srad.
   
This DQR also applies to a1 level data.
Measurements:twpvceil25kC3.b1:
  • sum_backscatter

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