Data Quality Reports for Session: 103705 User: yan Completed: 01/16/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D020814.12NSA/SKYRAD/C2 - reprocess: PIR identified as unshaded is really shadednsaskyrad60sC2.b1
D030619.1NSA/SKYRAD/C2 - Solar tracker problem.nsaskyrad60sC2.b1
D030821.3NSA/SKYRAD/C2 - IRT incorrect min/max valuesnsaskyrad60sC2.b1
D031007.1NSA/SKYRAD/C2 - IRT measurements during precipitation eventsnsaskyrad60sC2.b1
D040523.2NSA/SKYRAD/C2 - Frosting and CondensationnsaskyradC2.00, nsaskyrad20sC2.a1, nsaskyrad60sC2.b1
D051202.2NSA/SKYRAD/C2 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2
downwelling longwave
nsaskyrad20sC2.a0, nsaskyrad60sC2.b1
D060630.38NSA/SKYRAD/C2 - Reprocess: Longwave Calibration errornsaskyrad60sC2.b1
D060724.1NSA/SKYRAD/C2 - Summer solstice shading of radiometersnsaskyrad60sC2.b1


DQRID : D020814.12
Start DateStart TimeEnd DateEnd Time
05/24/2002025006/24/20022359
Subject:
NSA/SKYRAD/C2 - reprocess: PIR identified as unshaded is really shaded
DataStreams:nsaskyrad60sC2.b1
Description:
On 5/24/02 the Global PIR was moved from the unshaded
position on the Skyrad stand to a shaded spot on the 
tracker.  It is still using the same Logger channel as
it did as an unshaded PIR even though it is now shaded.
Measurements:nsaskyrad60sC2.b1:
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer(down_long_hemisp_unshaded)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Standard
    Deviation(down_long_hemisp_unshaded_std)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Minima(down_long_hemisp_unshaded_min)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Maxima(down_long_hemisp_unshaded_max)


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DQRID : D030619.1
Start DateStart TimeEnd DateEnd Time
06/13/2003000006/20/20031718
Subject:
NSA/SKYRAD/C2  - Solar tracker problem.
DataStreams:nsaskyrad60sC2.b1
Description:
Beginning on 6/13, there was a problem with the solar 
tracker/shading at Atqasuk.  The observed downwelling shortwave
was not in good agreement with the theoretical value calculated 
from the direct, diffuse, and solar zenith angle, which usually 
indicates a tracking problem. The direct (NIP) data occasionally 
exhibited a stair-step pattern of dropping off slightly for a few 
minutes, then rising, then dropping off again, rather than the 
smooth increase during the hours of greater sunlight that is 
normally observed in clear sky conditions.

This problem was resolved on the morning of 6/20.
Measurements:nsaskyrad60sC2.b1:
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated 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, Pyrheliometer(short_direct_normal)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)


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DQRID : D030821.3
Start DateStart TimeEnd DateEnd Time
04/01/2001024803/01/20032359
Subject:
NSA/SKYRAD/C2  - IRT incorrect min/max values
DataStreams:nsaskyrad60sC2.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:nsaskyrad60sC2.b1:
  • Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
  • Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)


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DQRID : D031007.1
Start DateStart TimeEnd DateEnd Time
08/21/1999000006/01/20032130
Subject:
NSA/SKYRAD/C2 - IRT measurements during precipitation events
DataStreams:nsaskyrad60sC2.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:nsaskyrad60sC2.b1:
  • Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
  • Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
  • Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)


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DQRID : D040523.2
Start DateStart TimeEnd DateEnd Time
05/13/2004000005/18/20040000
Subject:
NSA/SKYRAD/C2 - Frosting and Condensation
DataStreams:nsaskyradC2.00, nsaskyrad20sC2.a1, nsaskyrad60sC2.b1
Description:
The operators in both Barrow and Atqasuk reported significant ice buildup during nights 
for the period specified, with the ice melting during the days. This condition is reported 
in preventative maintenance reports as continuing until on or near 5/18/2004. However, 
review of data shows no discernable radiometer icing.
Measurements:nsaskyrad20sC2.a1:
  • Instantaneous Uncorrected Downwelling Ultraviolet Irradiance, UV Biometer(inst_down_uvb_irradiance)
  • Instantaneous PIR1 uncorrected irradiance(pir1_uncorr_irradiance)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_case_resist)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Unshaded Pyrgeometer(inst_down_long_hemisp_unshaded_tp)
  • Instantaneous PIR2 uncorrected irradiance(pir2_uncorr_irradiance)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer2(inst_down_long_hemisp_shaded2_tp)
  • Instantaneous PIR2 case thermistor(pir2_case_therm)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_dome_resist)
  • Instantaneous UVB uncorrected irradiance(uvb_uncorr_irradiance)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer1(inst_down_long_hemisp_shaded1_tp)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Unshaded
    Pyrgeometer(inst_down_long_unshaded_case_resist)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer(inst_down_long_shaded_case_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Unshaded
    Pyrgeometer(inst_down_long_unshaded_dome_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_dome_resist)
  • Instantaneous PIR1 case thermistor(pir1_case_therm)
  • Instantaneous PIR2 dome thermistor(pir2_dome_therm)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_case_resist)
  • Instantaneous PIR1 dome thermistor(pir1_dome_therm)
  • Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer(inst_down_long_shaded_dome_resist)
  • Instantaneous UVB temperature(uvb_temp)
  • Instantaneous Downwelling Ultraviolet Biometer Temperature(inst_down_uvb_temp)

nsaskyradC2.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

nsaskyrad60sC2.b1:
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer(down_long_hemisp_unshaded)
  • PSP1 unshaded standard deviation(psp1_sd)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Maxima(down_long_hemisp_shaded1_max)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
  • Sky/Cloud Infra-Red Temperature Standard Deviation(sky_ir_temp_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
  • PSP1 unshaded maximum(psp1_max)
  • UVB maximum(uvb_max)
  • Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Standard
    Deviation(down_long_hemisp_shaded1_std)
  • IRT1 maximum(irt1_max)
  • PSP shaded minimum(psps_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
    Deviation(down_long_hemisp_shaded_std)
  • PSP shaded maximum(psps_max)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Minima(down_long_hemisp_unshaded_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Minima(down_short_hemisp_min)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • PIR1 unshaded minimum(pir1_min)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • NIP standard deviation(nip_sd)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Standard
    Deviation(down_long_hemisp_shaded2_std)
  • IRT1 standard deviation(irt1_sd)
  • PSP1 unshaded mean(psp1_mean)
  • PIR shaded maximum(pirs_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Maxima(down_short_hemisp_max)
  • IRT1 minimum(irt1_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Minima(down_long_hemisp_shaded2_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)
  • PSP shaded mean(psps_mean)
  • NIP maximum(nip_max)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Standard Deviation(down_uvb_std)
  • PIR1 unshaded maximum(pir1_max)
  • NIP mean(nip_mean)
  • UVB minimum(uvb_min)
  • Time offset of tweaks from base_time(time_offset)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer(down_short_hemisp)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Maxima(down_long_hemisp_unshaded_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Maxima(down_long_hemisp_shaded2_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2(down_long_hemisp_shaded2)
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Standard Deviation(down_short_diffuse_hemisp_std)
  • Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
  • PIR1 unshaded standard deviation(pir1_sd)
  • PIR shaded mean(pirs_mean)
  • PSP shaded standard deviation(psps_sd)
  • PIR shaded standard deviation(pirs_sd)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Minima(down_long_hemisp_shaded1_min)
  • UVB standard deviation(uvb_sd)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Standard
    Deviation(down_long_hemisp_unshaded_std)
  • UVB mean(uvb_mean)
  • PIR shaded minimum(pirs_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • NIP minimum(nip_min)
  • Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)
  • PIR1 unshaded mean(pir1_mean)
  • PSP1 unshaded minimum(psp1_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
  • IRT1 mean(irt1_mean)


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DQRID : D051202.2
Start DateStart TimeEnd DateEnd Time
11/16/2004000009/09/20052133
Subject:
NSA/SKYRAD/C2 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 
downwelling longwave
DataStreams:nsaskyrad20sC2.a0, nsaskyrad60sC2.b1
Description:
The excitation delays using in measuring the PIR1 case thermistor commonly named "Case1" 
and the PIR2 dome thermistor called "Dome2" were discovered to have been incorrectly set 
to 0 in the Skyrad datalogger program when the new CR23X based Skyrad loggers were 
installed.  The result of no delay in these measurements results in an error in the measured 
resistance of the thermistors, Case1 and Dome2 and thus the calculated PIR1 and PIR2 
irradiances.  The errors are inversely proportial to temperature.

Users can apply temperature dependent irradiance corrections shown in the table below.  
Recall that the reported uncertainty of PIRs is typically +-.25% to +-.5% or 1 to 2 W/m2.  
The error corrections become the same order of magnitude or larger than the instrument 
uncertainties at or below 260K or 9F.

Correction Table for Skyrad (TWP and NSA) DIR1 and DIR2 Irradiance				
	DIR1	DIR1	DIR2	DIR2
T[F]	Tcase[K]	Correction[W/m2]	Tdome[K]	Correction[W/m2]
109.4	316.13	0.00	316.13	0.00
100.5	311.20	-0.15	311.20	0.12
93.2	307.14	-0.12	307.14	0.10
87.0	303.70	-0.10	303.70	0.08
81.6	300.70	-0.17	300.70	0.14
77.0	298.15	-0.22	298.15	0.18
59.4	288.35	-0.34	288.35	0.27
47.4	281.72	-0.23	281.72	0.18
38.5	276.74	-0.42	276.74	0.34
31.3	272.77	-0.48	272.77	0.38
25.4	269.48	-0.61	269.48	0.49
20.3	266.67	-0.67	266.67	0.54
16.0	264.25	-0.82	264.25	0.66
12.1	262.11	-0.98	262.11	0.79
8.7	260.19	-0.97	260.19	0.78
5.6	258.46	-1.07	258.46	0.86
2.7	256.89	-1.17	256.89	0.94
0.1	255.44	-1.33	255.44	1.07
-2.3	254.11	-1.41	254.11	1.13
-4.5	252.87	-1.43	252.87	1.15
-6.6	251.71	-1.52	251.71	1.22
-8.5	250.63	-1.63	250.63	1.31
-10.4	249.62	-1.73	249.62	1.39
-12.2	248.58	-1.79	248.58	1.44
-15.4	246.82	-1.93	246.82	1.55
-18.3	245.23	-2.05	245.23	1.65
-20.9	243.78	-2.22	243.78	1.78
-23.3	242.44	-2.36	242.44	1.89
-25.5	241.21	-2.58	241.21	2.07
-27.5	240.07	-2.65	240.07	2.13
-29.5	239.01	-2.75	239.01	2.21
-31.3	238.00	-3.02	238.00	2.42
Measurements:nsaskyrad60sC2.b1:
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Minima(down_long_hemisp_shaded2_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Maxima(down_long_hemisp_shaded1_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Minima(down_long_hemisp_shaded1_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Maxima(down_long_hemisp_shaded2_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2(down_long_hemisp_shaded2)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Standard
    Deviation(down_long_hemisp_shaded1_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Standard
    Deviation(down_long_hemisp_shaded2_std)

nsaskyrad20sC2.a0:
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer1(inst_down_long_hemisp_shaded1_tp)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer2(inst_down_long_hemisp_shaded2_tp)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_case_resist)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_case_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_dome_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_dome_resist)


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DQRID : D060630.38
Start DateStart TimeEnd DateEnd Time
11/16/2004163012/21/20052244
Subject:
NSA/SKYRAD/C2 - Reprocess: Longwave Calibration error
DataStreams:nsaskyrad60sC2.b1
Description:
Modified pyrgeometer calibration procedures were implemented beginning in December 2003.  
These modified procedures introduced a calibration bias in the longwave data.  The 
previous procedures were re-implemented at all sites between December 2005 and February 2006 to 
restore proper calibrations.                                                             
                The data collected while the incorrect procedures were in place are 
being reprocessing to remove the calibration bias.  Note, this also affected standard 
deviation, maximum and minimum data fields.
Measurements:nsaskyrad60sC2.b1:
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2(down_long_hemisp_shaded2)


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DQRID : D060724.1
Start DateStart TimeEnd DateEnd Time
05/08/2000000008/05/20000000
05/08/2001000008/05/20010000
05/08/2002000008/05/20020000
05/08/2003000008/05/20030000
05/08/2004000008/05/20040000
05/08/2005000008/05/20050000
05/08/2006000008/05/20060000
Subject:
NSA/SKYRAD/C2 - Summer solstice shading of radiometers
DataStreams:nsaskyrad60sC2.b1
Description:
On and around the summer solstice, the NIP (Direct Normal shortwave measurement) and PSP 
(global hemispheic shortwave measurement) radiometers are shaded by other instruments or 
support structures. Shading azimuths have been determined for this site.  The radiometer 
mentor suggests not using the data from the NIP and PSP radiometers when the sun is within 
the following azimuth bounds (typically from May 8th to August 5th of each year):
Instr   Obstruction   AzStart   AzEnd
NIP     rad table     356       17
PSP     mfrsr         341       353

Note: There are a number of objects near the NW,N and NE horizon that may affect sunrise 
data near the summer soltice.
Measurements:nsaskyrad60sC2.b1:
  • PSP1 unshaded standard deviation(psp1_sd)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Minima(down_short_hemisp_min)
  • PSP shaded standard deviation(psps_sd)
  • PSP shaded mean(psps_mean)
  • NIP maximum(nip_max)
  • NIP mean(nip_mean)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer(down_short_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
  • PSP1 unshaded maximum(psp1_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • NIP minimum(nip_min)
  • NIP standard deviation(nip_sd)
  • PSP1 unshaded minimum(psp1_min)
  • PSP shaded minimum(psps_min)
  • PSP1 unshaded mean(psp1_mean)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Maxima(down_short_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
  • PSP shaded maximum(psps_max)


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