Data Quality Reports for Session: 106364 User: yan Completed: 07/03/2007

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D061016.1TWP/SKYRAD/C2 - IRT signaltwpskyrad60sC2.b1
D070206.1TWP/SKYRAD/C2 - Short direct normaltwpskyrad20sC2.a0, twpskyrad60sC2.b1
D070404.2TWP/SKYRAD/C2 - IRT calibrationtwpskyrad60sC2.b1


DQRID : D061016.1
Start DateStart TimeEnd DateEnd Time
10/13/2006013512/04/20062120
Subject:
TWP/SKYRAD/C2 - IRT signal
DataStreams:twpskyrad60sC2.b1
Description:
The IRT exhibited a bias of the analog voltage output that caused problems with the 
signals from the other SKYRAD radiometers. The bias was due to corrosion between the power and 
signal connections in the IRT cable. The IRT was disconnected on 10/18/2006 at 01:20 and 
replaced on 11/6/2006 at 23:00 but it too appeared to have grounding problems due to 
internal corrosion and was disconnected on 11/11/2006 at 11:42 and then intermittently 
reconnected for testing. A second spare was installed on 12/4/2006 which did not cause problems 
with the signals from the other instruments.
Measurements:twpskyrad60sC2.b1:
  • Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
  • Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)
  • Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)

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DQRID : D070206.1
Start DateStart TimeEnd DateEnd Time
01/31/2007022302/10/20070055
Subject:
TWP/SKYRAD/C2 - Short direct normal
DataStreams:twpskyrad20sC2.a0, twpskyrad60sC2.b1
Description:
The short_direct_normal (NIP) data are missing or incorrect due to instrument cable 
failure.  The cable was replaced.

The short_direct_normal can be calculated using the following relationship for shortwave 
radiometers:
global hemispheric = diffuse hemispheric + direct normal *cos (zenith angle)
Measurements:twpskyrad60sC2.b1:
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
twpskyrad20sC2.a0:
  • Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
    Voltage(inst_direct_normal)

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DQRID : D070404.2
Start DateStart TimeEnd DateEnd Time
12/04/2006212002/22/20070125
Subject:
TWP/SKYRAD/C2 - IRT calibration
DataStreams:twpskyrad60sC2.b1
Description:
The IRT was not properly calibrated and was not able to measure sky temperatures below 
273.2 K. (This instrument was the same one damaged by lightning in November 2005 in Darwin. 
It was returned for repair and received a new lens but was calibrated only down to 0 deg 
C, so the problem was neither detected nor repaired.) The IRT was replaced on 2/22/2007.
Measurements:twpskyrad60sC2.b1:
  • Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
  • Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)
  • Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)

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