DQR ID | Subject | Data Streams Affected |
---|---|---|
D040421.3 | NSA/SKYRAD/C1 - itermittant IRT bias | nsaskyrad60sC1.b1 |
D050604.1 | NSA/SKYRAD/C1 - Datalogger grounding problem | nsaskyradC1.00, nsaskyrad20sC1.a0, nsaskyrad20sC1.a1, nsaskyrad60sC1.b1 |
D050629.1 | NSA/GNDRAD/C1/C2 - Upwelling Shortwave data flagged bad are good. | nsagndrad60sC1.b1, nsagndrad60sC2.b1 |
D050725.7 | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsa5mwravgC1.c1, nsaqmemwrcolC1.c1 |
D050825.3 | NSA/GNDRAD/C1 - Power Disconnected Briefly | nsagndrad60sC1.b1 |
D051101.2 | NSA/SKYRAD/C1 - IRT failure | nsaskyrad60sC1.b1 |
D051107.2 | NSA/SKYRAD/C1 - Instrument logger, possible gounding problem | nsaskyradC1.00, nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D051202.1 | NSA/SKYRAD/C1 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 downwelling longwave | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D060209.4 | NSA/GNDRAD/C1 - power outage affecting some GNDRAD sensors | nsagndradC1.00, nsagndrad20sC1.a0, nsagndrad60sC1.b1 |
D060209.5 | NSA/SKYRAD/C1 - Power outage affecting some SKYRAD instruments | nsaskyradC1.00, nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D060217.2 | NSA/SKYRAD/C1 - Instrument noise | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D060630.37 | NSA/SKYRAD/C1 - Reprocess: Longwave Calibration error | nsaskyrad60sC1.b1 |
D060630.39 | NSA/GNDRAD/C1 - Reprocess: Longwave Calibration error | nsagndrad60sC1.b1 |
D060724.2 | NSA/SKYRAD/C1 - Summer solstice shading of radiometers | nsaskyrad60sC1.b1 |
D060824.1 | NSA/GNDRAD/C1 - Incorrect calibration coefficients | nsagndradC1.00, nsagndrad20sC1.a0, nsagndrad20sC1.a1, nsagndrad60sC1.b1 |
D071002.1 | NSA/SKYRAD/C1 - Preventive maintenance | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D071010.1 | NSA/GNDRAD/C1 - Preventive maintenance | nsagndrad20sC1.a0, nsagndrad60sC1.b1 |
D071025.1 | NSA/SKYRAD/C1 - Reprocessed: Incorrect calibration coefficient | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D071025.3 | NSA/GNDRAD/C1 - Reprocessed: Incorrect calibration coefficient | nsagndrad20sC1.a0, nsagndrad60sC1.b1 |
D080107.2 | NSA/SKYRAD/C1 - Instrument cleaning effects | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D080222.3 | NSA/SKYRAD/C1 - IRT mirror heater failure | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D080418.1 | NSA/SKYRAD/C1 - Direct and Diffuse incorrect | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D080630.1 | NSA/SKYRAD/C1 - Tracker inoperative | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
D080904.5 | NSA/GNDRAD/C1 - Upwelling PIR ventilator fan failure | nsagndrad20sC1.a0, nsagndrad60sC1.b1 |
D090318.1 | NSA/SKYRAD/C1 - IRT covered with snow | nsaskyrad60sC1.b1 |
D100211.1 | NSA/SKYRAD/C1 - Frosting/Condensation | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/28/2003 | 0200 | 06/21/2006 | 0215 |
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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/13/2005 | 1100 | 05/13/2005 | 2000 |
05/19/2005 | 0830 | 05/24/2005 | 1800 |
05/28/2005 | 1730 | 05/29/2005 | 1800 |
05/31/2005 | 1500 | 06/04/2005 | 0900 |
06/10/2005 | 0300 | 06/10/2005 | 0400 |
Subject: | NSA/SKYRAD/C1 - Datalogger grounding problem |
DataStreams: | nsaskyradC1.00, nsaskyrad20sC1.a0, nsaskyrad20sC1.a1, nsaskyrad60sC1.b1 |
Description: | Both PIRs reported unreasonable high readings with coincident low reading from the IRT. Since both PIR instruments exhibited exactly the same behaviour and the IRT an opposite response during large suspect data excursions this indicates that the false signal maybe the result of poor grounding. The PIR1,2 data and the IRT data are most adversely affected. During the problem periods PIR irradiance increased (typ pos 200-300W/m2) while the IRT response was negative (typ neg 20-30W/m2) but followed the response of the PIR. The Skyrad shortwave instruments were also affected but to much less extent (within their uncertainties). Data quality flags are typically not triggered during these problem periods. Data logger grounding was improved on 6/10 2005. The problem hasn't re-occurred since that time. |
Measurements: | nsaskyradC1.00:
nsaskyrad60sC1.b1:
nsaskyrad20sC1.a1:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/01/2005 | 0000 | 04/30/2005 | 2359 |
Subject: | NSA/GNDRAD/C1/C2 - Upwelling Shortwave data flagged bad are good. |
DataStreams: | nsagndrad60sC1.b1, nsagndrad60sC2.b1 |
Description: | The Upwelling Shortwave at both NSA facilites, C1 and C2, have been flagged red by the automatic tests because it is above empiical limits determined for a more southerly site (SGP) for this time of year. The data are good and should be flagged green. The test limits will be revised for NSA. |
Measurements: | nsagndrad60sC1.b1:
nsagndrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/25/2002 | 1900 | 06/29/2005 | 0000 |
Subject: | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsa5mwravgC1.c1, nsaqmemwrcolC1.c1 |
Description: | IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant (1957) liquid water absorption model. Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz (1998) water vapor and oxygen absorption models and the Liebe (1991) liquid waer absorption model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water absorption model decreased the LWP by 10% relative to the Grant model. However, the increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA). Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz (1998), provided a better fit to the microwave brightness temperature measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals. Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals provide 3 percent less PWV and 2.6 percent greater LWP than the previous retrievals based on Rosenkranz (1998). Although the MWR data will be reprocessed to apply the new monortm-based retrievals, for most purposes it will be sufficient to correct the data using the following factors: PWV_MONORTM = 0.9695 * PWV_ROSENKRANZ LWP_MONORTM = 1.026 * LWP_ROSENKRANZ The Rosenkranz-based retrieval coefficients became active at NSA.C1 20020425.1900. The MONORTM-based retrieval coefficients became active at NSA.C1 20050629.0000. Note: a reprocessing effort is already underway to apply the Rosenkranz-based retrieval coefficients to all MWR prior to April 2002. An additional reprocessing task will be undertaken to apply the MONORTM retrieval to all MWR data when the first is completed. Read reprocessing comments in the netcdf file header carefully to ensure you are aware which retrieval is in play. |
Measurements: | nsa5mwravgC1.c1:
nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsaqmemwrcolC1.c1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/24/2005 | 0030 | 08/24/2005 | 0030 |
Subject: | NSA/GNDRAD/C1 - Power Disconnected Briefly |
DataStreams: | nsagndrad60sC1.b1 |
Description: | Power to the Tip tower and Groundrad was disconnected briefly while ground resistance measurements were made. The following comments are from Inst. Mentor Tom Stoffel: The longwave and shortwave irradiances from GNDRAD were not effected by the temporary power disconnect. Data are good. This would have only stopped the ventilators for a brief time and the data do not show any signs of poor instrument responses. The "sfc_ir_temp" data were, however, impacted during the brief (2 readings?) interval. |
Measurements: | nsagndrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/31/2005 | 0600 | 01/18/2006 | 0032 |
Subject: | NSA/SKYRAD/C1 - IRT failure |
DataStreams: | nsaskyrad60sC1.b1 |
Description: | The IRT failed and was replaced with a spare. |
Measurements: | nsaskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/22/2005 | 1230 | 10/22/2005 | 1600 |
Subject: | NSA/SKYRAD/C1 - Instrument logger, possible gounding problem |
DataStreams: | nsaskyradC1.00, nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
Description: | Possible Skyrad datalogger grounding issues have re-appeared at NSA/C1 for only this short time period. Anomalous data readings during the time range specified are similar to problem which occurred in early summer 2005. |
Measurements: | nsaskyradC1.00:
nsaskyrad60sC1.b1:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/04/2004 | 1900 | 09/09/2005 | 2142 |
Subject: | NSA/SKYRAD/C1 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 |
DataStreams: | nsaskyrad20sC1.a0, nsaskyrad60sC1.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 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. 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: | nsaskyrad60sC1.b1:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/07/2006 | 0910 | 02/07/2006 | 2350 |
Subject: | NSA/GNDRAD/C1 - power outage affecting some GNDRAD sensors |
DataStreams: | nsagndradC1.00, nsagndrad20sC1.a0, nsagndrad60sC1.b1 |
Description: | During the power outage the upwelling global measurement from the PSP 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 upwelling 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: | nsagndrad60sC1.b1:
nsagndradC1.00:
nsagndrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/07/2006 | 0910 | 02/07/2006 | 2350 |
Subject: | NSA/SKYRAD/C1 - Power outage affecting some SKYRAD instruments |
DataStreams: | nsaskyradC1.00, nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
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:
nsaskyrad60sC1.b1:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/15/2006 | 1300 | 02/16/2006 | 1500 |
Subject: | NSA/SKYRAD/C1 - Instrument noise |
DataStreams: | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
Description: | Skyrad data appears affected by noise creating bias in analog voltage readings on 02/15/2006 from 1300-1800GMT and again on 02/16/2006 from 1300-1500GMT. The second night the noise is attenuated significantly. By 02/17 no bias/noise is detectable. The thermistor measurements in PIR1 and PIR2 were unaffected during these excursions and showed no deviation from normal during the problem period. In addition, the onboard logger temperature and battery voltage read normal throughout. The problem has not reappeared as of 4/25/2006. |
Measurements: | nsaskyrad60sC1.b1:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/04/2004 | 0300 | 12/21/2005 | 1853 |
Subject: | NSA/SKYRAD/C1 - Reprocess: Longwave Calibration error |
DataStreams: | nsaskyrad60sC1.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: | nsaskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/04/2004 | 1600 | 12/21/2005 | 1855 |
Subject: | NSA/GNDRAD/C1 - Reprocess: Longwave Calibration error |
DataStreams: | nsagndrad60sC1.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: | nsagndrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/08/1999 | 0000 | 08/05/1999 | 0000 |
05/08/2000 | 0000 | 08/05/2000 | 0000 |
05/08/2001 | 0000 | 08/05/2001 | 0000 |
05/08/2002 | 0000 | 08/05/2002 | 0000 |
05/08/2003 | 0000 | 08/05/2003 | 0000 |
05/08/2004 | 0000 | 08/05/2004 | 0000 |
05/08/2005 | 0000 | 08/05/2005 | 0000 |
05/08/2006 | 0000 | 08/05/2006 | 0000 |
Subject: | NSA/SKYRAD/C1 - Summer solstice shading of radiometers |
DataStreams: | nsaskyrad60sC1.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): Instrmt Obstruction AzStart AzEnd NIP rad table 346 358 NIP met tower 13 15 PSP mfrsr 6 16 |
Measurements: | nsaskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/11/2006 | 1930 | 08/25/2006 | 1859 |
Subject: | NSA/GNDRAD/C1 - Incorrect calibration coefficients |
DataStreams: | nsagndradC1.00, nsagndrad20sC1.a0, nsagndrad20sC1.a1, nsagndrad60sC1.b1 |
Description: | BarrowC1, Gndrad. On Aug 11th the PSP-US was changed out and the Campbell program was changed to reflect this. However, an old program that uses the 4 coefficient PIR cal factors was used. The PIR-UIR was not changed out, however, the logger program coeffs reverted back to the 4 Coeffcients. The Eppley PIR-UIR coefficients for this S/N 30168F3 are : K0=0.0, K1(aka k)=.25253, K2= 1.0, K3=-4, Kr=0.0. |
Measurements: | nsagndrad60sC1.b1:
nsagndradC1.00:
nsagndrad20sC1.a1:
nsagndrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/30/2007 | 1937 | 10/03/2007 | 0300 |
Subject: | NSA/SKYRAD/C1 - Preventive maintenance |
DataStreams: | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
Description: | Preventive maintenance to rebuild ventilator fan and exchange instruments during this time removed Skyrad instruments from operation. Most data collected are not scientifically relevant. |
Measurements: | nsaskyrad60sC1.b1:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/02/2007 | 2300 | 10/04/2007 | 0145 |
Subject: | NSA/GNDRAD/C1 - Preventive maintenance |
DataStreams: | nsagndrad20sC1.a0, nsagndrad60sC1.b1 |
Description: | Preventive maintenance including ventilator repairs and instrument changeout during this time resulted in data that are not scientifically relevant. |
Measurements: | nsagndrad60sC1.b1:
nsagndrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/03/2007 | 0359 | 10/25/2007 | 2148 |
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:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/04/2007 | 0130 | 10/25/2007 | 2149 |
Subject: | NSA/GNDRAD/C1 - Reprocessed: Incorrect calibration coefficient |
DataStreams: | nsagndrad20sC1.a0, nsagndrad60sC1.b1 |
Description: | Installed Gndrad PSP (upwelling shortwave hemispheric irradiance) had calibration coefficient RS applied when it should have used Rsc. ARM is using IR corrected coefficients Rsc@45 and CFc@45 for PSPs deployed at all facilities. PSP #32012F3 should use RSc@45=109.39 and not Rs@45=110.97. Reprocessed to correct upwelling shortwave hemispheric irradiance (US) by: US(new) = (US(old) / 110.97 ) * 109.39 Reprocessing completed March 2008. |
Measurements: | nsagndrad60sC1.b1:
nsagndrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/16/2007 | 0000 | 12/24/2007 | 2359 |
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:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/16/2007 | 0000 | 02/11/2008 | 1135 |
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:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/17/2008 | 0632 | 04/23/2008 | 1815 |
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:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/27/2008 | 2000 | 06/30/2008 | 1740 |
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:
nsaskyrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/20/2008 | 0330 | 09/15/2008 | 1930 |
Subject: | NSA/GNDRAD/C1 - Upwelling PIR ventilator fan failure |
DataStreams: | nsagndrad20sC1.a0, nsagndrad60sC1.b1 |
Description: | The PIR exhibited a positive bias of approximately 6 W/m2 compared to the upwelling IRT due to ventilator fan failure. Thus, the up_long_hemisp, data stream is high by about 6 W/m2. Bias is not consistent and depends on atmospheric conditions. Either disregard the up_long_hemisp data or use the IRT for an estimate of the up_long_hemisp values during this time period. |
Measurements: | nsagndrad60sC1.b1:
nsagndrad20sC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/20/2009 | 1900 | 02/24/2009 | 0130 |
Subject: | NSA/SKYRAD/C1 - IRT covered with snow |
DataStreams: | nsaskyrad60sC1.b1 |
Description: | The IRT mirror was buried with snow by the dew-line snow-blower. |
Measurements: | nsaskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/18/2010 | 0345 | 01/21/2010 | 0030 |
01/24/2010 | 1930 | 01/26/2010 | 0800 |
02/09/2010 | 1500 | 02/09/2010 | 2300 |
Subject: | NSA/SKYRAD/C1 - Frosting/Condensation |
DataStreams: | nsaskyrad20sC1.a0, nsaskyrad60sC1.b1 |
Description: | The down_long_hemisp1 varied up to 40 W/m^2 higher than down_long_hemisp2 during the affected time periods. Cold temperatures reported by the IRT suggest the issue is with PIR1. Icing or frost on PIR1 or within the ventilator may be to blame but ops reports can't substantiate this. Data from PIR1 should be avoided during these suspect time periods. |
Measurements: | nsaskyrad60sC1.b1:
nsaskyrad20sC1.a0:
|