Data Quality Reports for Session: 102642 User: kjohnson Completed: 11/14/2006


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060113.1TWP/VCEIL/C3 - low receiver sensitivitytwpvceil25kC3.b1
D060426.8TWP/SMET/C3 - ORG data noisy due to degraded groundtwpsmet60sC3.b1
D060629.1TWP/MMCR/C3 - Reprocess: Reflectivity Calibration ProblemstwpmmcrmomC3.b1, twpmmcrspecmomC3.a0
D060818.3TWP/SMET/C3 - Reprocess: Barometric Data Changed from hPa to kPatwpsmet60sC3.b1
D061011.4TWP/SMET/C3 - Reprocess: Tipping bucket rain gauge addedtwpsmet60sC3.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 : D060426.8
Start DateStart TimeEnd DateEnd Time
12/01/2005000008/24/20062359
Subject:
TWP/SMET/C3 - ORG data noisy due to degraded ground
DataStreams:twpsmet60sC3.b1
Description:
SMET Rain Data began to be noisy during December 2005 and the problem slowly became worse 
over time so that in February 2006 the ORG was reporting with a constant background value 
of around 0.10 mm/hr rain rate.  ORG voltage showed a near constant value above the 85mV 
threshold.  The ground for the ORG had become degraded and was lost due to corrosion.
Measurements:twpsmet60sC3.b1:
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • precipitation minimum(precip_min)


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DQRID : D060629.1
Start DateStart TimeEnd DateEnd Time
12/02/2005000007/18/20062359
Subject:
TWP/MMCR/C3 - Reprocess: Reflectivity Calibration Problems
DataStreams:twpmmcrmomC3.b1, twpmmcrspecmomC3.a0
Description:
There was a problem with the reflectivity values being shifted 15-20 dBz less than what 
one might expect them to be.  The low noise amplifier (LNA) was damaged by lightning.  The 
LNA was replaced 20060718.
Measurements:twpmmcrspecmomC3.a0:
  • First Order Estimate of Spectral Count Calibration(CalibrationConstant)
  • Radar Constant(RadarConstant)
  • Receiver Gain(RxGain)
  • Receiver Sky Noise(SkyNoiseLevel)
  • Minimum detectable reflectivity(MinimumDetectableReflectivity)
  • Receiver 290K Level(Rx290KLevel)
  • Receiver Cal Check Level(CalCheckLevel)

twpmmcrmomC3.b1:
  • Receiver Sky Noise(SkyNoiseLevel)
  • Receiver Cal Check Level(CalCheckLevel)
  • Minimum detectable reflectivity(MinimumDetectableReflectivity)
  • Range Corrected Calibrated Power(RangeCorrectedPower)
  • Receiver 290K Level(Rx290KLevel)
  • MMCR Reflectivity(Reflectivity)
  • Radar Constant(RadarConstant)
  • Receiver Gain(RxGain)


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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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DQRID : D061011.4
Start DateStart TimeEnd DateEnd Time
03/12/2002000009/26/20061435
Subject:
TWP/SMET/C3 - Reprocess: Tipping bucket rain gauge added
DataStreams:twpsmet60sC3.b1
Description:
A tipping bucket rain gauge was added to the SMET suite of instruments effective 20060926. 
 Two new variables (count and rain amount) were added at the end of the twpsmet60sC1.b1 
datastream.  When reprocessing of this datastream occurs these variables will be added 
with -9999 (missing) as the value for dates prior to gauge installation.
Measurements:twpsmet60sC3.b1:
  • Time offset from base_time(base_time)


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