Data Quality Reports for Session: 184372 User: martinm1 Completed: 03/20/2017

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D061214.1TWP/SKYRAD/C3 - NIP instrument failuretwpskyrad60sC3.b1Incorrect
D080414.1TWP/SKYRAD/C3 - IRT power supplytwpskyrad60sC3.b1Incorrect
D080904.6TWP/SKYRAD/C3 - Contaminationtwpskyrad60sC3.b1Suspect
D081222.2TWP/SKYRAD/C3 - Direct normal instrument failuretwpskyrad60sC3.b1Incorrect
D090129.1TWP/SKYRAD/C3 - Tracker inoperativetwpskyrad60sC3.b1Incorrect
D091112.6TWP/SKYRAD/C3 - IRT power supplytwpskyrad60sC3.b1Missing
D100706.1TWP/SKYRAD/C3 - IRT power supplytwpskyrad60sC3.b1Missing
D131220.3TWP/SKYRAD/C3 - IRT biastwpskyrad60sC3.b1Suspect
D141204.1TWP/SKYRAD/C3 - Reprocess: Incorrect qc_flag valuestwpskyrad60sC3.b1Does not affect quality


DQRID : D061214.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
12/13/2006034201/16/20070440Incorrect
Subject:
TWP/SKYRAD/C3 - NIP instrument failure
DataStreams:twpskyrad60sC3.b1
Description:
The NIP (Short Direct Normal) was replaced after it displayed symptoms of failure 
associated with either unknown precipitation related issues or a possible lightning strike.

NIP data are not recoverable.  Direct normal data can be reconstructed from global 
hemispheric and global diffuse data using the following relationship:
   global hemispheric = direct*cos(sza) + diffuse hemispheric
Measurements:twpskyrad60sC3.b1:
  • Shortwave Direct Normal Irradiance(short_direct_normal)
  • Irradiance, shortwave, direct normal, pyrheliometer, mifkba(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • short_direct_normal_std

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DQRID : D080414.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
04/11/2008190104/14/20082205Incorrect
Subject:
TWP/SKYRAD/C3 - IRT power supply
DataStreams:twpskyrad60sC3.b1
Description:
The 12-to-24V DC converter the provides power to the IRT had shut down and was restarted 
by power-cycling.
Measurements:twpskyrad60sC3.b1:
  • sky_ir_temp_min
  • sky_ir_temp_max
  • Sky infrared temperature(sky_ir_temp)
  • sky_ir_temp_std

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DQRID : D080904.6
Start DateStart TimeEnd DateEnd Time Data Quality Metric
06/08/2008000009/05/20080053Suspect
Subject:
TWP/SKYRAD/C3 - Contamination
DataStreams:twpskyrad60sC3.b1
Description:
The IRT exhibited a positive bias compared to AERI. The problem was corrected when the 
lens and mirror were cleaned.
Measurements:twpskyrad60sC3.b1:
  • sky_ir_temp_min
  • sky_ir_temp_max
  • Sky infrared temperature(sky_ir_temp)
  • sky_ir_temp_std

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DQRID : D081222.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
12/14/2008045712/30/20080040Incorrect
Subject:
TWP/SKYRAD/C3 - Direct normal instrument failure
DataStreams:twpskyrad60sC3.b1
Description:
The NIP instrument (short_direct_normal data stream) failed giving bad data during this 
time period.  The failure start time coincides with a reported DC power failure but no 
connection between the reported power failure and the failure of this instrument could be 
determined. 

Ops also reported the tracker clock running 2.9 minutes slow during maintenance on 12/22 
0300GMT (see CS-2008-0714).  Again, the slow clock is not suspect and did not appear to 
affect alignment.

Ops replaced the NIP instrument on 12/30 and short_direct_normal data resumed normal 
operation.

Disregard the short_direct_normal (NIP) data during this time period or calculate using 
the global and diffuse instruments and the following relationship:
short_direct_normal = ((down_short_hemisp - down_short_diffuse_hemisp))/cos(zenith angle)
Measurements:twpskyrad60sC3.b1:
  • Shortwave Direct Normal Irradiance(short_direct_normal)
  • Irradiance, shortwave, direct normal, pyrheliometer, mifkba(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • short_direct_normal_std

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DQRID : D090129.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/23/2009210001/27/20090715Incorrect
Subject:
TWP/SKYRAD/C3 - Tracker inoperative
DataStreams:twpskyrad60sC3.b1
Description:
The tracker at Darwin failed 01/23.  The tracker was power cycled on 01/27 and it returned 
to normal operation.

The affected data streams are short_direct_normal (NIP) and down_short_diffuse_hemisp 
(8-48).  

The down_short_hemisp are not affected.  

The down_long_hemisp1 and 2 (PIR1 and PIR2) should not be affected but direct sun can 
affect individual instrument performance.
Measurements:twpskyrad60sC3.b1:
  • inst_down_long_hemisp2_dome_temp
  • Shortwave Direct Normal Irradiance(short_direct_normal)
  • down_long_hemisp2_min
  • inst_down_long_hemisp1_case_temp
  • down_long_hemisp2_max
  • down_long_hemisp1_std
  • down_long_hemisp1_max
  • down_long_hemisp1_min
  • down_short_diffuse_hemisp_std
  • Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer, minima(down_short_diffuse_hemisp_min)
  • inst_down_long_hemisp1_tp
  • short_direct_normal_std
  • inst_down_long_hemisp2_tp
  • Irradiance, shortwave, direct normal, pyrheliometer, mifkba(short_direct_normal_min)
  • inst_down_long_hemisp1_dome_temp
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2(down_long_hemisp2)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp1)
  • Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer, maxima(down_short_diffuse_hemisp_max)
  • inst_down_long_hemisp2_case_temp
  • Irradiance, shortwave, downwelling, diffuse, hemispheric, pyranometer(down_short_diffuse_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • down_long_hemisp2_std

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DQRID : D091112.6
Start DateStart TimeEnd DateEnd Time Data Quality Metric
11/07/2009194011/11/20090100Missing
Subject:
TWP/SKYRAD/C3 - IRT power supply
DataStreams:twpskyrad60sC3.b1
Description:
The IRT external DC power supply had shut down for an unknown reason. The problem was 
corrected by restarting the power supply.
Measurements:twpskyrad60sC3.b1:
  • sky_ir_temp_min
  • sky_ir_temp_max
  • Sky infrared temperature(sky_ir_temp)
  • sky_ir_temp_std

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DQRID : D100706.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/04/2010092905/05/20102345Missing
Subject:
TWP/SKYRAD/C3 - IRT power supply
DataStreams:twpskyrad60sC3.b1
Description:
The IRT power supply failed and was replaced.
Measurements:twpskyrad60sC3.b1:
  • sky_ir_temp_min
  • sky_ir_temp_max
  • Sky infrared temperature(sky_ir_temp)
  • sky_ir_temp_std

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DQRID : D131220.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
02/25/2002120006/29/20070001Suspect
Subject:
TWP/SKYRAD/C3 - IRT bias
DataStreams:twpskyrad60sC3.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:twpskyrad60sC3.b1:
  • sky_ir_temp_min
  • sky_ir_temp_max
  • Sky infrared temperature(sky_ir_temp)

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DQRID : D141204.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/28/2013234512/08/20142359Does not affect quality
Subject:
TWP/SKYRAD/C3 - Reprocess: Incorrect qc_flag values
DataStreams:twpskyrad60sC3.b1
Description:
When the IRTs were upgraded, the values of sky_ir_temp:min and sky_ir_temp:max were not 
changed. The quality control fields for these limits are incorrect.
Measurements:twpskyrad60sC3.b1:
  • sky_ir_temp_min
  • sky_ir_temp_max
  • Sky infrared temperature(sky_ir_temp)
  • sky_ir_temp_std

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