| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D030317.3 | TWP/GNDRAD/C1 - GNDRAD logger configured as SMET | twpgndradC1.00, twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
| D030730.1 | TWP/GNDRAD/C2 - IRT problem | twpgndrad60sC2.b1 |
| D031215.2 | TWP/GNDRAD/C1 -PIRdown and PSPdown Inverted for Comparison | twpgndradC1.00, twpgndrad20sC1.a1, twpgndrad60sC1.b1 |
| D040416.1 | TWP/GNDRAD/C3 - IRT bias | twpgndrad60sC3.b1 |
| D041015.3 | TWP/GNDRAD/C2 - incorrect IRT calibration | twpgndrad60sC2.b1 |
| D041106.2 | TWP/GNDRAD/C1 - GNDRAD inverted for radiometer comparison | twpgndrad60sC1.b1 |
| D050221.2 | TWP/GNDRAD/C3 - IRT bias | twpgndrad60sC3.b1 |
| D050221.3 | TWP/GNDRAD/C3 - Reprocess: IRT with wrong calibration | twpgndrad60sC3.b1 |
| D050504.2 | TWP/GNDRAD/C2 - IRT connector | twpgndrad60sC2.b1 |
| D050815.1 | TWP/GNDRAD/C2 - IRT power supply failed | twpgndradC2.00, twpgndrad60sC2.b1 |
| D050919.4 | TWP/GNDRAD/C3 - Tower inverted for instrument testing and replacement | twpgndrad60sC3.b1 |
| D050926.6 | TWP/GNDRAD/C2 - Gndrad inverted for radiometer | twpgndrad60sC2.b1 |
| D051123.2 | TWP/GNDRAD/C1 - Gndrad inverted for comparison of radiometers | twpgndrad60sC1.b1 |
| D051206.5 | TWP/GNDRAD/C3 - IRT malfunction | twpgndrad60sC3.b1 |
| D060111.1 | TWP/GNDRAD/C3 - IRT power | twpgndrad60sC3.b1 |
| D060509.1 | TWP/GNDRAD/C3 - IRT failed | twpgndrad60sC3.b1 |
| D060630.34 | TWP/GNDRAD/C1 - Reprocess: Longwave Calibration error | twpgndrad60sC1.b1 |
| D060630.35 | TWP/GNDRAD/C2 - Reprocess: Longwave Calibration error | twpgndrad60sC2.b1 |
| D060630.36 | TWP/GNDRAD/C3 - Reprocess: Longwave Calibration error | twpgndrad60sC3.b1 |
| D060823.1 | TWP/GNDRAD/C3 - IRT bias | twpgndrad60sC3.b1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/03/2003 | 1700 | 03/13/2003 | 2130 |
| Subject: | TWP/GNDRAD/C1 - GNDRAD logger configured as SMET |
| DataStreams: | twpgndradC1.00, twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
| Description: | the configuration for the SMET was inadvertently loaded into the GNDRAD at Manus at 03/03/2003 17:00 GMT. This error was found and corrected on 03/13/2003 at 21:30 GMT. |
| Measurements: | twpgndrad20sC1.a1:
twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
twpgndradC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/12/2003 | 2100 | 09/14/2003 | 1100 |
| Subject: | TWP/GNDRAD/C2 - IRT problem |
| DataStreams: | twpgndrad60sC2.b1 |
| Description: | The GNDRAD IRT exhibited a positive bias compared to the PIR from 2100 to 0700 UTC each day. The problem was corrected by removing the signal cable, cleaning the contacts, and reconnecting the cable. |
| Measurements: | twpgndrad60sC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/2003 | 0620 | 12/09/2003 | 1155 |
| Subject: | TWP/GNDRAD/C1 -PIRdown and PSPdown Inverted for Comparison |
| DataStreams: | twpgndradC1.00, twpgndrad20sC1.a1, twpgndrad60sC1.b1 |
| Description: | PIRdown and PSPdown instruments inverted for comparison with calibrated instruments. |
| Measurements: | twpgndrad20sC1.a1:
twpgndrad60sC1.b1:
twpgndradC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/07/2004 | 0230 | 04/08/2004 | 1200 |
| 04/12/2004 | 0600 | 04/27/2004 | 1400 |
| 05/08/2004 | 0300 | 05/15/2004 | 2200 |
| 05/27/2004 | 1100 | 06/09/2004 | 0000 |
| 12/29/2004 | 1100 | 01/06/2005 | 2300 |
| Subject: | TWP/GNDRAD/C3 - IRT bias |
| DataStreams: | twpgndrad60sC3.b1 |
| Description: | The IRT behaved erratically, jumping frequently from reporting about 50 Wm^(-2) higher than the PIR for surface irradiance values to about 100Wm^(-2) lower than the PIR. Generally, the IRT measured lower surface temperatures than expected from the PIR. |
| Measurements: | twpgndrad60sC3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/05/2004 | 0501 | 07/19/2004 | 0206 |
| Subject: | TWP/GNDRAD/C2 - incorrect IRT calibration |
| DataStreams: | twpgndrad60sC2.b1 |
| Description: | When the GNDRAD data logger was upgraded, the calibration offset for the IRT was initially incorrect. |
| Measurements: | twpgndrad60sC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/01/2004 | 0040 | 11/05/2004 | 2318 |
| Subject: | TWP/GNDRAD/C1 - GNDRAD inverted for radiometer comparison |
| DataStreams: | twpgndrad60sC1.b1 |
| Description: | The GNDRAD PIR and PSP were inverted during this period for comparison with replacement instruments. |
| Measurements: | twpgndrad60sC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/10/2004 | 0700 | 12/25/2004 | 0300 |
| Subject: | TWP/GNDRAD/C3 - IRT bias |
| DataStreams: | twpgndrad60sC3.b1 |
| Description: | The IRT measured higher surface temperatures than expected from the PIR, even at night. |
| Measurements: | twpgndrad60sC3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/17/2004 | 0000 | 11/19/2004 | 0105 |
| Subject: | TWP/GNDRAD/C3 - Reprocess: IRT with wrong calibration |
| DataStreams: | twpgndrad60sC3.b1 |
| Description: | A spare IRT was installed that was not configured properly. |
| Measurements: | twpgndrad60sC3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/27/2005 | 2330 | 04/03/2005 | 0240 |
| Subject: | TWP/GNDRAD/C2 - IRT connector |
| DataStreams: | twpgndrad60sC2.b1 |
| Description: | The IRT had a problem with the connector of either the signal or power cable which produced an output of 0 volts equivalent to a measurement of 223K. The problem was corrected when the connectors were cleaned and tightened. |
| Measurements: | twpgndrad60sC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/11/2005 | 1648 | 08/16/2005 | 2230 |
| Subject: | TWP/GNDRAD/C2 - IRT power supply failed |
| DataStreams: | twpgndradC2.00, twpgndrad60sC2.b1 |
| Description: | The IRT output dropped to its minimum output of 223 K (0 volts). It was determined the 24 V DC converter had failed. The converter was replaced on 16 August and the instrument began reporting normally again. The IRT data are unusable during the five day period when the DC converter was faulty. The GNDRAD (down-looking) IRT is used primarily for surface temperature. The PIR can be used for this purpose by inverting the IR flux equation, Flux = sigma*temperature^4 where sigma = 5.67x10-8 W/m^2K^4. But, unlike the IRT, the PIR measurement is strongly effected by the air temperature in addition to the surface temperature. At night, when the air temperature approaches the surface temperature, the PIR provides a good estimate of the surface temperature. During the day, however, the PIR tends to underestimate the ground temperature, particularly on sunny days. The magnitude of the underestimate can be estimated by evaluating periods when both instruments are operating but is typically on the order of 5-10C. |
| Measurements: | twpgndradC2.00:
twpgndrad60sC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/05/2005 | 0030 | 08/05/2005 | 0200 |
| 08/09/2005 | 0000 | 08/09/2005 | 0200 |
| Subject: | TWP/GNDRAD/C3 - Tower inverted for instrument testing and replacement |
| DataStreams: | twpgndrad60sC3.b1 |
| Description: | The tower at Darwin was brought down to test and replace the Gndrad PIR on 8/5/2005 and the PSP on 8/9/2005 |
| Measurements: | twpgndrad60sC3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/17/2005 | 0152 | 09/23/2005 | 0115 |
| Subject: | TWP/GNDRAD/C2 - Gndrad inverted for radiometer |
| DataStreams: | twpgndrad60sC2.b1 |
| Description: | Gndrad instruments PIR and PSP inverted for replacement instrument installation and comparison |
| Measurements: | twpgndrad60sC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/11/2005 | 2230 | 11/17/2005 | 0030 |
| Subject: | TWP/GNDRAD/C1 - Gndrad inverted for comparison of radiometers |
| DataStreams: | twpgndrad60sC1.b1 |
| Description: | Radiometers GNDRAD PIR and PSP inverted for radiometer comparison |
| Measurements: | twpgndrad60sC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/21/2005 | 1500 | 12/05/2005 | 0100 |
| Subject: | TWP/GNDRAD/C3 - IRT malfunction |
| DataStreams: | twpgndrad60sC3.b1 |
| Description: | The internal IRT power supply failed (probably due to a lightning strike on 11/14) and was drawing excessive current on the data logger's DC system. The problem was corrected by replacing the instrument with a spare. |
| Measurements: | twpgndrad60sC3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/20/2005 | 2330 | 01/02/2006 | 2300 |
| Subject: | TWP/GNDRAD/C3 - IRT power |
| DataStreams: | twpgndrad60sC3.b1 |
| Description: | The IRT failed to report after a planned power outage to add lightning protection modules to the AC power wiring. The problem was corrected when a loose power connection to the logger was found, rectified, and power restored to the logger. |
| Measurements: | twpgndrad60sC3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/07/2006 | 0000 | 05/18/2006 | 2359 |
| Subject: | TWP/GNDRAD/C3 - IRT failed |
| DataStreams: | twpgndrad60sC3.b1 |
| Description: | The IRT began to fail on 4/7/2006 and failed completely (apparently due to the internal power supply) on 4/27. It was replaced on 5/18. |
| Measurements: | twpgndrad60sC3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/02/2004 | 0700 | 12/21/2005 | 2204 |
| Subject: | TWP/GNDRAD/C1 - Reprocess: Longwave Calibration error |
| DataStreams: | twpgndrad60sC1.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: | twpgndrad60sC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/05/2004 | 2202 | 12/21/2005 | 2149 |
| Subject: | TWP/GNDRAD/C2 - Reprocess: Longwave Calibration error |
| DataStreams: | twpgndrad60sC2.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: | twpgndrad60sC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/20/2004 | 0100 | 12/21/2005 | 2137 |
| Subject: | TWP/GNDRAD/C3 - Reprocess: Longwave Calibration error |
| DataStreams: | twpgndrad60sC3.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: | twpgndrad60sC3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/19/2006 | 0000 | 06/27/2006 | 0344 |
| Subject: | TWP/GNDRAD/C3 - IRT bias |
| DataStreams: | twpgndrad60sC3.b1 |
| Description: | The IRT reported higher surface temperatures than the PIR due to corrosion on the terminals of the lightning protection module and a ground wire error. The corrosion was cleaned and the wiring corrected. |
| Measurements: | twpgndrad60sC3.b1:
|