Data Quality Reports for Session: 101868 User: kjohnson Completed: 10/04/2006


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060113.1TWP/VCEIL/C3 - low receiver sensitivitytwpvceil25kC3.b1
D060224.3TWP/MPL/C3 - Temporary laser failuretwpmplC3.00, twpmplC3.a1
D060227.1TWP/MPL/C3 - Backscatter profiles are inaccurate due to computer HD corruption.twpmplC3.00, twpmplC3.a1
D060818.3TWP/SMET/C3 - Reprocess: Barometric Data Changed from hPa to kPatwpsmet60sC3.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:
  • Lowest cloud base height detected.(first_cbh)
  • Vertical visibility(vertical_visibility)
  • Aerosol volume backscattering coefficient at 355 nm(backscatter)
  • SUM of detected and normalized backscatter(sum_backscatter)
  • Second lowest cloud base height(second_cbh)
  • Third cloud base height(third_cbh)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Altitude of highest signal(alt_highest_signal)
  • Millivolts at internal ADC input (0 to 2500)(background_light)


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DQRID : D060224.3
Start DateStart TimeEnd DateEnd Time
02/20/2006060002/23/20060600
Subject:
TWP/MPL/C3 - Temporary laser failure
DataStreams:twpmplC3.00, twpmplC3.a1
Description:
No backscatter information is in the data. The backscatter data in the files during this 
time is solar background information only. 

The laser turned it's self off, reason: unknown. A power cycle of the entire system 
corrected the problem.
Measurements:twpmplC3.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

twpmplC3.a1:
  • Preliminary cloud base height above ground level(preliminary_cbh)
  • Attenuated backscatter(detector_counts)


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DQRID : D060227.1
Start DateStart TimeEnd DateEnd Time
02/24/2006060002/27/20060700
Subject:
TWP/MPL/C3 - Backscatter profiles are inaccurate due to computer HD corruption.
DataStreams:twpmplC3.00, twpmplC3.a1
Description:
The data shows a consistent cloud deck at 7.5km with what appears to be a duplication of 
the data from ground zero. The temperature and energy monitor values are also affected. 
The computer was found with multiple corruption problems. These corruptions may have cause 
the ghost data at 7.5km.  A chkdsk was performed which appears to have corrected the 
problem.
Measurements:twpmplC3.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

twpmplC3.a1:
  • Detector temperature(detector_temp)
  • Instrument temperature(instrument_temp)
  • Preliminary cloud base height above ground level(preliminary_cbh)
  • Attenuated backscatter(detector_counts)
  • Laser temperature(laser_temp)
  • Background signal(background_signal)
  • Energy output per pulse of transmitted laser beam at 523 nm (Doubled Nd-YLF)(energy_monitor)


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DQRID : D060818.3
Start DateStart TimeEnd DateEnd Time
12/02/2003000007/13/20062219
Subject:
TWP/SMET/C3 - Reprocess: Barometric Data Changed from hPa to kPa
DataStreams:twpsmet60sC3.b1
Description:
Barometric pressure data was converted from hPa to kPa in order to standardize the 
measurement units among ARM sites and to conform to accepted standard units determined by the 
scientific community.
Measurements:twpsmet60sC3.b1:
  • Atmospheric pressure(atmos_pressure)


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