DQR ID | Subject | Data Streams Affected |
---|---|---|
D051114.3 | TWP/SKYRAD/C3 - tracker inoperative | twpskyradC3.00, twpskyrad20sC3.a0, twpskyrad60sC3.b1 |
D051202.3 | TWP/SKYRAD/C3 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 downwelling longwave | twpskyrad60sC3.b1 |
D060110.3 | TWP/SKYRAD/C3 - IRT damaged | twpskyrad20sC3.a0, twpskyrad60sC3.b1 |
D060630.33 | TWP/SKYRAD/C3 - Reprocess: Longwave Calibration error | twpskyrad60sC3.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/14/2005 | 0453 | 12/02/2005 | 0000 |
Subject: | TWP/SKYRAD/C3 - tracker inoperative |
DataStreams: | twpskyradC3.00, twpskyrad20sC3.a0, twpskyrad60sC3.b1 |
Description: | A lightning strike at Darwin removed the tracker from service. Instruments installed on the tracker were rendered either inoperative or were not shaded during this time period. The longwave hemispheric instruments PIR1 and PIR2 appear to have been unaffected. They are not suseptable to incorrect tracker operation. The downwelling hemispheric shortwave PSP instrument mounted on Skyrad will not be affected by incorrect tracker operation. |
Measurements: | twpskyradC3.00:
twpskyrad60sC3.b1:
twpskyrad20sC3.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/21/2004 | 0000 | 09/09/2005 | 2012 |
Subject: | TWP/SKYRAD/C3 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 |
DataStreams: | twpskyrad60sC3.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 as 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: | twpskyrad60sC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/13/2005 | 2314 | 03/07/2006 | 0257 |
Subject: | TWP/SKYRAD/C3 - IRT damaged |
DataStreams: | twpskyrad20sC3.a0, twpskyrad60sC3.b1 |
Description: | The analog output of the IRT was damaged by a lightning strike. The problem was corrected by replacing the instrument with a spare. The damaged IRT was returned to the vendor for repair. |
Measurements: | twpskyrad60sC3.b1:
twpskyrad20sC3.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/20/2004 | 2200 | 12/21/2005 | 2136 |
Subject: | TWP/SKYRAD/C3 - Reprocess: Longwave Calibration error |
DataStreams: | twpskyrad60sC3.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: | twpskyrad60sC3.b1:
|