Data Quality Reports for Session: 101054 User: kjohnson Completed: 08/10/2006

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D051219.1NSA/VCEIL/C1 - poor sensitivity at low altitudensavceil25kC1.b1


DQRID : D051219.1
Start DateStart TimeEnd DateEnd Time
12/27/2005193005/02/20060000
Subject:
NSA/VCEIL/C1 - poor sensitivity at low altitude
DataStreams:nsavceil25kC1.b1
Description:
The ceilometer has an internal amplifier that it sets to low or high depending on 
prevalant conditions. Normally, the gain is automatically set high during clear skies. It appears 
that during these times, a slight degradation in either the transmitter or receiver is 
being amplified and produces a "ripple" at low altitudes in the backscatter plot. Cloud 
base height detection is not affected.
Measurements:nsavceil25kC1.b1:
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Aerosol volume backscattering coefficient at 355 nm(backscatter)

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