Data Quality Reports for Session: 135770 User: ruchi0114 Completed: 06/28/2011

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D100125.1NSA/MMCR/C1 - Reflectivity shiftnsammcrmomC1.b1, nsammcrspecmomC1.a0
D100125.2NSA/VCEIL/C1 - Missing datansavceil25kC1.b1
D100224.1NSA/MMCR/C1 - Reflectivity biasnsammcrmomC1.b1, nsammcrspecmomC1.a0
D100616.2NSA/VCEIL/C1 - Small gaps in datansavceil25kC1.b1


DQRID : D100125.1
Start DateStart TimeEnd DateEnd Time
01/10/2010000001/18/20101830
Subject:
NSA/MMCR/C1 - Reflectivity shift
DataStreams:nsammcrmomC1.b1, nsammcrspecmomC1.a0
Description:
A significantly high over-reporting of reflectivity occurred during this period.
Measurements:nsammcrmomC1.b1:
  • Cloud, reflectivity, at altitude(Reflectivity)
nsammcrspecmomC1.a0:
  • Cloud, reflectivity, at altitude(Reflectivity)

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DQRID : D100125.2
Start DateStart TimeEnd DateEnd Time
01/23/2010060001/25/20102041
Subject:
NSA/VCEIL/C1 - Missing data
DataStreams:nsavceil25kC1.b1
Description:
Data are missing and unrecoverable.
Measurements:nsavceil25kC1.b1:
  • Third cloud base height(third_cbh)
  • alt_highest_signal
  • receiver_sensitivity
  • laser_temperature
  • Second lowest cloud base height(second_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • filename
  • Vertical visibility(vertical_visibility)
  • tilt_angle
  • time_offset
  • measurement_parameters
  • lat
  • status_flag
  • sum_backscatter
  • lon
  • range
  • base_time
  • alt
  • Backscatter(backscatter)
  • background_light
  • status_string
  • window_contamination
  • laser_pulse_energy
  • detection_status

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DQRID : D100224.1
Start DateStart TimeEnd DateEnd Time
01/10/2010000001/18/20101930
Subject:
NSA/MMCR/C1 - Reflectivity bias
DataStreams:nsammcrmomC1.b1, nsammcrspecmomC1.a0
Description:
The MMCR calibration was incorrect causing a very large positive shift in reflectivity 
values.
Measurements:nsammcrmomC1.b1:
  • Cloud, reflectivity, at altitude(Reflectivity)
nsammcrspecmomC1.a0:
  • Cloud, reflectivity, at altitude(Reflectivity)

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DQRID : D100616.2
Start DateStart TimeEnd DateEnd Time
12/03/2009210706/15/20102143
Subject:
NSA/VCEIL/C1 - Small gaps in data
DataStreams:nsavceil25kC1.b1
Description:
When the ceilometer was replaced, small gaps in the netCDF files occurred due to the 
presence of '?' characters in the backscatter and header records of the raw data that could 
not be ingested. It is unknown whether this was caused by a poor CPU board or 
incompatibilities with the computer configuration (hyper-threading). The problem was corrected when 
the instrument and computer were both replaced. 

During this period, approximately 3% of data are missing each hour due to this problem.
Measurements:nsavceil25kC1.b1:
  • Third cloud base height(third_cbh)
  • alt_highest_signal
  • receiver_sensitivity
  • laser_temperature
  • Second lowest cloud base height(second_cbh)
  • Lowest cloud base height detected.(first_cbh)
  • Vertical visibility(vertical_visibility)
  • tilt_angle
  • time_offset
  • measurement_parameters
  • status_flag
  • sum_backscatter
  • range
  • base_time
  • Backscatter(backscatter)
  • status_string
  • background_light
  • window_contamination
  • laser_pulse_energy
  • detection_status

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