Data Quality Reports for Session: 114516 User: hori Completed: 10/02/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040421.3NSA/SKYRAD/C1 - itermittant IRT biasnsaskyrad60sC1.b1
D051101.2NSA/SKYRAD/C1 - IRT failurensaskyrad60sC1.b1
D060209.5NSA/SKYRAD/C1 - Power outage affecting some SKYRAD instrumentsnsaskyrad20sC1.a0, nsaskyrad60sC1.b1, nsaskyradC1.00
D071025.1NSA/SKYRAD/C1 - Reprocessed: Incorrect calibration coefficientnsaskyrad20sC1.a0, nsaskyrad60sC1.b1
D080107.2NSA/SKYRAD/C1 - Instrument cleaning effectsnsaskyrad20sC1.a0, nsaskyrad60sC1.b1
D080222.3NSA/SKYRAD/C1 - IRT mirror heater failurensaskyrad20sC1.a0, nsaskyrad60sC1.b1
D080418.1NSA/SKYRAD/C1 - Direct and Diffuse incorrectnsaskyrad20sC1.a0, nsaskyrad60sC1.b1
D080630.1NSA/SKYRAD/C1 - Tracker inoperativensaskyrad20sC1.a0, nsaskyrad60sC1.b1


DQRID : D040421.3
Start DateStart TimeEnd DateEnd Time
03/28/2003020006/21/20060215
Subject:
NSA/SKYRAD/C1 - itermittant IRT bias
DataStreams:nsaskyrad60sC1.b1
Description:
A problem with the SKYRAD IRT that itermittantly produced a gradual increase in the sky 
temperature measurement then a sudden correction, as compared to AERI, appears to have been 
caused by a combination of a failing IR detector, a poor signal cable, a contaminated 
(with condensation or frost) mirror or lens, and low ambient temperatures. The positive 
bias was apparently not consistant in either frequency or duration but on days when the 
unusual behavior is observed, it usually occurred from about 00:00 to 06:00 local time. 

The instrument was repaired and recalibrated and the signal cable replaced.
Measurements:nsaskyrad60sC1.b1:
  • Sky Infra Red Temperature Minima(sky_ir_temp_min)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)
  • Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)

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DQRID : D051101.2
Start DateStart TimeEnd DateEnd Time
10/31/2005060001/18/20060032
Subject:
NSA/SKYRAD/C1 - IRT failure
DataStreams:nsaskyrad60sC1.b1
Description:
The IRT failed and was replaced with a spare.
Measurements:nsaskyrad60sC1.b1:
  • Sky Infra Red Temperature Minima(sky_ir_temp_min)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)
  • Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)

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DQRID : D060209.5
Start DateStart TimeEnd DateEnd Time
02/07/2006091002/07/20062350
Subject:
NSA/SKYRAD/C1 - Power outage affecting some SKYRAD instruments
DataStreams:nsaskyrad20sC1.a0, nsaskyrad60sC1.b1, nsaskyradC1.00
Description:
During the power outage the downwelling global measurement from the PSP instrument and 
downwelling diffuse 8-48 instrument shows a slight increase from -5 to +0 W/m2.  This is due 
to removal of thermal offsets induced by the AC heater during the power outage.  This 
heater is installed within the PSP ventilator - it is necessary for the NSA/C1 climate.
The downwelling longwave PIR instrument is unaffected due to case and dome temperature 
corrections.
The IRT is AC powered and was not operational during this time period.
Measurements:nsaskyradC1.00:
  • null(Raw data stream - documentation not supported)
nsaskyrad60sC1.b1:
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
nsaskyrad20sC1.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)
  • Instantaneous Sky/Cloud Infrared(inst_sky_ir_signal)
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)

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DQRID : D071025.1
Start DateStart TimeEnd DateEnd Time
10/03/2007035910/25/20072148
Subject:
NSA/SKYRAD/C1 - Reprocessed: Incorrect calibration coefficient
DataStreams:nsaskyrad20sC1.a0, nsaskyrad60sC1.b1
Description:
Installed Skyrad PSP (downwelling shortwave hemispheric irradiance) had calibration 
coefficient Rs applied when it should have used Rsc.  ARM is using IR corrected Rsc and CFc 
coefficients for PSPs deployed at all facilities.  

PSP #32026 should use RSc@45=8.7578 ?V/W/m? and not Rs@45=8.6335.

Reprocessed to correct downwelling shortwave hemispheric irradiance (DS) by:
DS(new) = (DS(old) / 115.83 ) * 114.18

Reprocessing completed March 2008.
Measurements:nsaskyrad60sC1.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)
nsaskyrad20sC1.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)

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DQRID : D080107.2
Start DateStart TimeEnd DateEnd Time
12/16/2007000012/24/20072359
Subject:
NSA/SKYRAD/C1 - Instrument cleaning effects
DataStreams:nsaskyrad20sC1.a0, nsaskyrad60sC1.b1
Description:
Starting Dec 16th the Skyrad PIR1 and PIR2 (down_long_hemispheric)started differing by 
greater than 30W/m2 at times.  This is much greater than expected  for these instruments 
(typical is <10-15 W/m2).  NSA OMIS reports and observer comments reveal that PM 
periodically clean the snow from the IRT and ventilator fans on Skyrad and Gndrad.  In the case of 
the Skyrad PIRs, one lies in the wind shadow of the other and builds up more snow which is 
periodically cleaned out and then builds up again causing the PIR1 PIR2 discrepancies.

Disregard down_long_hemispheric during this time period. However, data suggests PIR2 is 
most likely at fault - potentially use PIR1 data during this time period.
Measurements:nsaskyrad60sC1.b1:
  • Downwelling Longwave Hemispheric Irradiance, Pyrgeometer2, Minima(down_long_hemisp2_min)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Pyrgeometer2(inst_down_long_hemisp2_tp)
  • Downwelling Longwave Hemispheric Irradiance, Pyrgeometer2, Standard Deviation(down_long_hemisp2_std)
  • Downwelling Longwave Hemispheric Irradiance, Pyrgeometer1, Standard Deviation(down_long_hemisp1_std)
  • Downwelling Longwave Hemispheric Irradiance, Pyrgeometer2, Maxima(down_long_hemisp2_max)
  • Downwelling Longwave Hemispheric Irradiance, Pyrgeometer1, Minima(down_long_hemisp1_min)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Pyrgeometer1(inst_down_long_hemisp1_dome_temp)
  • Downwelling Longwave Hemispheric Irradiance, Pyrgeometer2(down_long_hemisp2)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Pyrgeometer1(inst_down_long_hemisp1_case_temp)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Pyrgeometer2(inst_down_long_hemisp2_case_temp)
  • Downwelling Longwave Hemispheric Irradiance, Pyrgeometer1(down_long_hemisp1)
  • Downwelling Longwave Hemispheric Irradiance, Pyrgeometer1, Maxima(down_long_hemisp1_max)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Pyrgeometer2(inst_down_long_hemisp2_dome_temp)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Pyrgeometer1(inst_down_long_hemisp1_tp)
nsaskyrad20sC1.a0:
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer1(inst_down_long_hemisp1_case_resist)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Pyrgeometer2(inst_down_long_hemisp2_tp)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Pyrgeometer1(inst_down_long_hemisp1_tp)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer2(inst_down_long_hemisp2_dome_resist)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer2(inst_down_long_hemisp2_case_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer1(inst_down_long_hemisp1_dome_resist)

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DQRID : D080222.3
Start DateStart TimeEnd DateEnd Time
12/16/2007000002/11/20081135
Subject:
NSA/SKYRAD/C1 - IRT mirror heater failure
DataStreams:nsaskyrad20sC1.a0, nsaskyrad60sC1.b1
Description:
The heater of the IRT gold mirror failed due to a broken wire (that probably occurred on 
12/13 during maintenance of the solar tracker) allowing snow and frost to accumulate on 
the mirror until it was cleared during daily preventative maintenance. The problem was 
corrected when the heater wires were replaced.
Measurements:nsaskyrad60sC1.b1:
  • Sky Infra Red Temperature Minima(sky_ir_temp_min)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)
  • Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)
nsaskyrad20sC1.a0:
  • Instantaneous Sky/Cloud Infrared(inst_sky_ir_signal)

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DQRID : D080418.1
Start DateStart TimeEnd DateEnd Time
04/17/2008063204/23/20081815
Subject:
NSA/SKYRAD/C1 - Direct and Diffuse incorrect
DataStreams:nsaskyrad20sC1.a0, nsaskyrad60sC1.b1
Description:
The short_direct_normal (NIP) instrument and cable were damaged by tracker rewind 
malfunction. Tracker and NIP replaced on 4/22 2200GMT but tracker not operational until 4/23 
1815GMT.  Thus, down_short_diffuse_hemisp (8-48) was not shaded 4/22 to 4/23.

Do not use 8-48 data from 4/22 to 4/23. NIP data is not recoverable during entire time but 
can be estimated using component sum for each 1 minute data: Direct = (global - 
diffuse)/cos(zenith angle)
Measurements:nsaskyrad60sC1.b1:
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
nsaskyrad20sC1.a0:
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)

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DQRID : D080630.1
Start DateStart TimeEnd DateEnd Time
06/27/2006200006/30/20081740
Subject:
NSA/SKYRAD/C1 - Tracker inoperative
DataStreams:nsaskyrad20sC1.a0, nsaskyrad60sC1.b1
Description:
Tracker stopped working at this site during the time range specified. Reason for failure 
is unknown.  Tracker power cycled and restarted by maintenance 06/30 2008 1740 GMT.

The short_direct_normal (NIP) and down_short_diffuse_hemisp (8-48) data are bad during 
this time.  Data are not recoverable.
Measurements:nsaskyrad60sC1.b1:
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
nsaskyrad20sC1.a0:
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)

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