Data Quality Reports for Session: 101025 User: perez Completed: 08/09/2006

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D030311.1TWP/SKYRAD/C2 - Reprocess: Incorrect UVB Calibration Coefficienttwpskyrad20sC2.a1, twpskyrad60sC2.a1, twpskyrad60sC2.b1
D030417.1TWP/SKYRAD/C2 - UVB Data questionable/incorrect due to uncontrolled sensor temperaturetwpskyrad20sC2.a1, twpskyrad60sC2.a1, twpskyrad60sC2.b1
D030821.5TWP/SKYRAD/C2 - IRT incorrect min/delta valuestwpskyrad60sC2.b1
D040107.1TWP/SKYRAD/C2 - Tracker ProblemtwpskyradC2.00, twpskyrad60sC2.b1
D040812.3TWP/SKYRAD/C2 - UVB Data questionable/incorrect due to uncontrolled sensor temperaturetwpskyrad20sC2.a1, twpskyrad60sC2.b1
D041026.2TWP/SKYRAD/C2 - IRT biastwpskyrad60sC2.b1
D050219.2TWP/SKYRAD/C2 - IRT biastwpskyrad60sC2.b1
D051202.6TWP/SKYRAD/C2 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2
downwelling longwave		twpskyrad20sC2.a0, twpskyrad60sC2.b1
D060630.32TWP/SKYRAD/C2 - Reprocess: Longwave Calibration errortwpskyrad60sC2.b1


DQRID : D030311.1
Start DateStart TimeEnd DateEnd Time
03/03/2003050003/11/20030700
Subject:
TWP/SKYRAD/C2 - Reprocess: Incorrect UVB Calibration Coefficient
DataStreams:twpskyrad20sC2.a1, twpskyrad60sC2.a1, twpskyrad60sC2.b1
Description:
The uvb calibration coefficient was entered incorrectly as 0.2151
instead of 0.2332.
Measurements:twpskyrad20sC2.a1:
  • Instantaneous Uncorrected Downwelling Ultraviolet Irradiance, UV Biometer(inst_down_uvb_irradiance)
twpskyrad60sC2.b1:
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Standard Deviation(down_uvb_std)
  • Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)
twpskyrad60sC2.a1:
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)
  • Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Standard Deviation(down_uvb_std)

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DQRID : D030417.1
Start DateStart TimeEnd DateEnd Time
11/20/1998000003/03/20032359
Subject:
TWP/SKYRAD/C2 - UVB Data questionable/incorrect due to uncontrolled sensor temperature
DataStreams:twpskyrad20sC2.a1, twpskyrad60sC2.a1, twpskyrad60sC2.b1
Description:
The UVB was not temperature controlled to 25C as required
to ensure accurate data.  UVB data should ONLY be used after 
checking both the bit_data and twpskyrad20sC1.a1 uvb_temp
or inst_down_uvb_temp.  UVB data where the UVB temperature
was outside the range of 24-26C should not be used.
Measurements:twpskyrad20sC2.a1:
  • Instantaneous Uncorrected Downwelling Ultraviolet Irradiance, UV Biometer(inst_down_uvb_irradiance)
  • Instantaneous UVB uncorrected irradiance(uvb_uncorr_irradiance)
  • Instantaneous Downwelling Ultraviolet Biometer Temperature(inst_down_uvb_temp)
  • Instantaneous UVB temperature(uvb_temp)
twpskyrad60sC2.b1:
  • UVB standard deviation(uvb_sd)
  • Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)
  • UVB maximum(uvb_max)
  • UVB minimum(uvb_min)
  • UVB mean(uvb_mean)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Standard Deviation(down_uvb_std)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)
twpskyrad60sC2.a1:
  • UVB standard deviation(uvb_sd)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)
  • Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
  • UVB mean(uvb_mean)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Standard Deviation(down_uvb_std)
  • UVB maximum(uvb_max)
  • UVB minimum(uvb_min)

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DQRID : D030821.5
Start DateStart TimeEnd DateEnd Time
04/01/2001000503/03/20032102
Subject:
TWP/SKYRAD/C2  - IRT incorrect min/delta values
DataStreams:twpskyrad60sC2.b1
Description:
For field sky_ir_temp, the value of valid_min was incorrectly assigned to -49.7 C and no 
value of valid_delta was assigned. The actual values should be -60 and 50 C, respectively.
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)

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DQRID : D040107.1
Start DateStart TimeEnd DateEnd Time
12/14/2003180001/08/20042359
Subject:
TWP/SKYRAD/C2 - Tracker Problem
DataStreams:twpskyradC2.00, twpskyrad60sC2.b1
Description:
The observers reported that the tracker was not shading the radiometers.
The sun sensor was damaged by moisture due to a missing front window.  The tracker had 
been in sun-sensing mode so required the sensor to maintain its proper orientation.  Troy 
Culgan placed the tracker in time-track mode (calculates solar position based on time, 
date, and location) until the sun sensor can be repaired.
Measurements:twpskyrad60sC2.b1:
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Minima(down_long_hemisp_shaded2_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Standard
    Deviation(down_long_hemisp_shaded2_std)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2(down_long_hemisp_shaded2)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Standard
    Deviation(down_long_hemisp_shaded1_std)
  • Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Maxima(down_long_hemisp_shaded2_max)
  • 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 Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Standard Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
twpskyradC2.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

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DQRID : D040812.3
Start DateStart TimeEnd DateEnd Time
03/04/2003000007/05/20042359
Subject:
TWP/SKYRAD/C2 - UVB Data questionable/incorrect due to uncontrolled sensor temperature
DataStreams:twpskyrad20sC2.a1, twpskyrad60sC2.b1
Description:
The UVB was not temperature controlled to 25C as required
to ensure accurate data.  UVB data should ONLY be used after 
checking both the bit_data and twpskyrad20sC1.a1 uvb_temp
or inst_down_uvb_temp.  UVB data where the UVB temperature
was outside the range of 24-26C should not be used.
Measurements:twpskyrad20sC2.a1:
  • Instantaneous Downwelling Ultraviolet Biometer Temperature(inst_down_uvb_temp)
  • Instantaneous Uncorrected Downwelling Ultraviolet Irradiance, UV Biometer(inst_down_uvb_irradiance)
twpskyrad60sC2.b1:
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Standard Deviation(down_uvb_std)
  • Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)

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DQRID : D041026.2
Start DateStart TimeEnd DateEnd Time
10/13/2004060010/18/20042300
Subject:
TWP/SKYRAD/C2 - IRT bias
DataStreams:twpskyrad60sC2.b1
Description:
The IRT appears to be measuring higher sky temperatures than the AERI. There is no 
indication as to its cause or whether the IRT or the AERI is at fault.

PRB note: because the AERI is calibrated between each sample, the AERI
data has a high degree of confidence and the bias is likely on the part
of the IRT.
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)

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DQRID : D050219.2
Start DateStart TimeEnd DateEnd Time
02/07/2005045404/17/20052023
Subject:
TWP/SKYRAD/C2 - IRT bias
DataStreams:twpskyrad60sC2.b1
Description:
The IRT was measuring higher sky temperatures than AERI. The problem was corrected by 
changing the mirror.
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 : D051202.6
Start DateStart TimeEnd DateEnd Time
07/05/2004220009/09/20052058
Subject:
TWP/SKYRAD/C2 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 
downwelling longwave
DataStreams:twpskyrad20sC2.a0, twpskyrad60sC2.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 absolute value of the errors are inversely proportial to temperature.

Users can apply the 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.
 
Irradiance 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:twpskyrad60sC2.b1:
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Minima(down_long_hemisp_shaded2_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Standard
    Deviation(down_long_hemisp_shaded2_std)
  • 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, Maxima(down_long_hemisp_shaded2_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Maxima(down_long_hemisp_shaded1_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Minima(down_long_hemisp_shaded1_min)
twpskyrad20sC2.a0:
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_dome_resist)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer2(inst_down_long_hemisp_shaded2_tp)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer1(inst_down_long_hemisp_shaded1_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)

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DQRID : D060630.32
Start DateStart TimeEnd DateEnd Time
07/05/2004050012/21/20052150
Subject:
TWP/SKYRAD/C2 - Reprocess: Longwave Calibration error
DataStreams:twpskyrad60sC2.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:twpskyrad60sC2.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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