Data Quality Reports for Session: 179141 User: pelerinm1 Completed: 08/21/2016

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D030821.2NSA/SKYRAD/C1 - IRT incorrect min/max valuensaskyrad60sC1.b1Does not affect quality
D031007.2NSA/SKYRAD/C1 - IRT measurements during precipitation eventsnsaskyrad60sC1.b1Suspect
D031226.1NSA/SKYRAD/C1 - NSA B&W nighttime offset in Barrow too largensaskyrad60sC1.b1Suspect
D131220.4NSA/SKYRAD/C1 - IRT biasnsaskyrad60sC1.b1Suspect


DQRID : D030821.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
04/01/2001000003/03/20032359Does not affect quality
Subject:
NSA/SKYRAD/C1 - IRT incorrect min/max value
DataStreams:nsaskyrad60sC1.b1
Description:
The values of valid_min and valid_max for field sky_ir_temp were incorrectly assigned to 
-49.7 and +50.0 C, respectively. The actual values should be -60 and +40 C.
Measurements:nsaskyrad60sC1.b1:
  • sky_ir_temp_min
  • sky_ir_temp_max
  • Sky/Cloud Infrared Temperature(sky_ir_temp)

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DQRID : D031007.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
04/01/1999000003/28/20030200Suspect
Subject:
NSA/SKYRAD/C1 - IRT measurements during precipitation events
DataStreams:nsaskyrad60sC1.b1
Description:
The IRT measurement of sky/cloud temperature was in question during
precipitation events because rain or snow could accumulate in the
upward-pointed lens barrel. This was corrected by reorienting the
IRT to measure the sky temperature as reflected by a gold mirror.
Measurements:nsaskyrad60sC1.b1:
  • sky_ir_temp_min
  • sky_ir_temp_std
  • sky_ir_temp_max
  • Sky/Cloud Infrared Temperature(sky_ir_temp)

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DQRID : D031226.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/20/2001000001/23/20020000Suspect
Subject:
NSA/SKYRAD/C1 - NSA B&W nighttime offset in Barrow too large
DataStreams:nsaskyrad60sC1.b1
Description:
This problem only became apparent as NSA C1 nights became long enough for full darkness. 
The shaded global diffuse instrument (Eppley 8-48) showed a negative nighttime offset 
larger than the expected 0 to -4 W/m2. Typically -5 to -8 W/m2. This size of offset is not 
uncommon with Eppley PSPs but not observed with Eppley 8-48s.  The problem was corrected 
with replacement of mounting screws which were creating a ground loop.
Measurements:nsaskyrad60sC1.b1:
  • psps_sd
  • psps_max
  • Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
  • psps_mean
  • psps_min
  • Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer, maxima(down_short_diffuse_hemisp_max)
  • down_short_diffuse_hemisp_std
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)

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DQRID : D131220.4
Start DateStart TimeEnd DateEnd Time Data Quality Metric
03/28/2001001508/20/20071830Suspect
Subject:
NSA/SKYRAD/C1 - IRT bias
DataStreams:nsaskyrad60sC1.b1
Description:
Measurements of sky temperature, especially those <250K, were positively biased compared 
with AERI because there was no compensation for the reflectivity of the gold mirror. The 
problem was corrected by changing the IRT emissivity from 1.000 to 0.987.

Use sky temperature measurements less than 230K with caution. Biases as large as 30K have 
been observed when the actual temperature, as measured by AERI, is less than 210 K.
Measurements:nsaskyrad60sC1.b1:
  • sky_ir_temp_min
  • sky_ir_temp_max
  • Sky/Cloud Infrared Temperature(sky_ir_temp)

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