DQR ID | Subject | Data Streams Affected |
---|---|---|
D000705.4 | TWP/SKYRAD/C1 - PSPs and NIP: Persistent bias | twpskyrad60sC1.b1 |
D000705.5 | TWP/SKYRAD/C1 - PSP: Removal of shading arm | twpskyrad60sC1.b1 |
D000705.6 | TWP/SKYRAD/C1 - PSPs and NIP: Periods of shortwave radiometer discrepancies | twpskyrad60sC1.b1 |
D000706.1 | TWP/SKYRAD/C1 - PSPs and NIP: Brief discrepancies, unknown cause | twpskyrad60sC1.b1 |
D000706.12 | TWP/SKYRAD/C1 - NIP: Moisture inside NIP | twpskyrad60sC1.b1 |
D000706.13 | TWP/SKYRAD/C1 - NIP: Anomalously low values | twpskyrad60sC1.b1 |
D011211.5 | TWP/GNDRAD/C1 - GNDRAD radiometer replacement | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
D020620.61 | TWP/C1 - Incorrect elevation reported in Manus Data | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1, twpsmet60sC1.a1, twpsmet60sC1.b1 |
D030730.1 | TWP/GNDRAD/C2 - IRT problem | twpgndrad60sC2.b1 |
D030821.5 | TWP/SKYRAD/C2 - IRT incorrect min/delta values | twpskyrad60sC2.b1 |
D030821.6 | TWP/SKYRAD/C3 - IRT incorrect min/delta values | twpskyrad60sC3.b1 |
D040428.2 | TWP/SKYRAD/C1 - IRT affected by rain or shutter | twpskyrad60sC1.b1 |
D981222.3 | TWP/GNDRAD/C1 - Incorrect dome calibration factor | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/10/1996 | 0000 | 07/31/1998 | 2359 |
Subject: | TWP/SKYRAD/C1 - PSPs and NIP: Persistent bias |
DataStreams: | twpskyrad60sC1.b1 |
Description: | The NIP/Eppley comparison shows that around solar noon, the NIP is low relative to the Eppleys by about 4% with this fraction decreasing slowly toward dawn and dusk. At very low sun angles, the NIP irradiance exceeds that from the Eppleys, presumably because of the roll off in the Eppley's cosine response at those angles. Larger discrepancies arise between the NIP and and direct beam calculated from the Eppleys during periods of sun following rain events. Significant examples of this phenomenon occurred on October 10 at 02 GMT and 05 GMT and on October 13 at 20 GMT. In the latter case, the rain had actually occurred the previous evening. We noticed another rain related peculiarity in the NIP data. On several occasions, when a rain event followed a period of full sun, the NIP actually overshot zero and went negative by about 10 watts (this is an estimated value only) and persisted for several minutes. Examples occurred on October 16, 17, and 31. In the morning, the sun is apparently blocked by a line of trees until about 2030 GMT because large but very brief discrepancies often occur at that time of day. In the afternoon, there is often convection over the main part of Manus Island to the west which blocks the direct beam. Another likely explanation is dew on the sensors. I have requested that the RESET team examine the sensors after dawn during their next visit (February 1997). This phenomenon occurs on November 4, 12, 13, 15, 17, 19, 20, 22, 27, 28, 30. Throughout the Manus record, there is a distinct tendency for the sum of the direct plus diffuse SW to be greater than the corresponding global PSP. The magnitude of the difference on average fluctuates around 2-3%. There was an increase in the average percent difference on about 19980509, roughly corresponding with the reset visit. However, the daily average percent differences exhibit a large variability around this mean, with a range from 0 - 8% for the period 19980509 - 19980731. Since the beginning of data collection rarely has the daily average difference been negative. While differences of a few percent should be expected, I believe that having these differences always biased warrants closer scrutiny. One would typically expect changes in these daily average differences to be highly correlated with RESET visits, which is not obvious in the data record, and to randomly switch sign given a large enough sample size, which we don't have yet. I recommend that we monitor this to make sure there's not an unknown SMALL system grounding problem or Campbell logging program glitch that is causing this bias. |
Measurements: | twpskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/23/1997 | 2000 | 02/24/1997 | 2300 |
Subject: | TWP/SKYRAD/C1 - PSP: Removal of shading arm |
DataStreams: | twpskyrad60sC1.b1 |
Description: | The shading arm for the SKYRAD shaded PSP was removed while instrument comparisons were being performed by the ARCS RESET team. |
Measurements: | twpskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/29/1997 | 0000 | 09/03/1997 | 2359 |
09/10/1997 | 0000 | 09/18/1997 | 2359 |
Subject: | TWP/SKYRAD/C1 - PSPs and NIP: Periods of shortwave radiometer discrepancies |
DataStreams: | twpskyrad60sC1.b1 |
Description: | The agreement between the NIP and the direct beam calculated from the shaded and unshaded PSPs is usually within 5%. However, during these periods there were larger discrepancies of 5-10%. |
Measurements: | twpskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/07/1997 | 0330 | 12/07/1997 | 0430 |
12/22/1997 | 0230 | 12/22/1997 | 0330 |
12/22/1997 | 0430 | 12/22/1997 | 0530 |
01/03/1998 | 0430 | 01/03/1998 | 0500 |
02/07/1998 | 0300 | 02/07/1998 | 0400 |
02/20/1998 | 0100 | 02/20/1998 | 0230 |
03/15/1998 | 0200 | 03/15/1998 | 0300 |
03/16/1998 | 0000 | 03/16/1998 | 0500 |
03/20/1998 | 0200 | 03/20/1998 | 0230 |
03/21/1998 | 0200 | 03/21/1998 | 0230 |
03/22/1998 | 0200 | 03/22/1998 | 0230 |
Subject: | TWP/SKYRAD/C1 - PSPs and NIP: Brief discrepancies, unknown cause |
DataStreams: | twpskyrad60sC1.b1 |
Description: | Observed anomalously large discrepancies between the NIP and the PSPs. |
Measurements: | twpskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/19/1997 | 0000 | 08/30/1997 | 2359 |
Subject: | TWP/SKYRAD/C1 - NIP: Moisture inside NIP |
DataStreams: | twpskyrad60sC1.b1 |
Description: | The NIP took on a significant amount of moisture during a rainy period that ended on 970719. From this date until the RESET visit in August, the NIP data is corrupted. The errors are large (often greater than 100 W/m^2 in the direct beam) in the morning but tend to converge to the expected values in the afternoon. In general, NIP data from this period should be used with extreme caution. |
Measurements: | twpskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/10/1997 | 0200 | 11/10/1997 | 0300 |
Subject: | TWP/SKYRAD/C1 - NIP: Anomalously low values |
DataStreams: | twpskyrad60sC1.b1 |
Description: | The NIP appears to be reporting anomalously low values (based on comparisons with other shortwave instruments). |
Measurements: | twpskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/25/2001 | 0000 | 10/25/2001 | 0100 |
Subject: | TWP/GNDRAD/C1 - GNDRAD radiometer replacement |
DataStreams: | twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The GNDRAD radiometers were replaced 10/25/01 from 00:00 to 01:00. |
Measurements: | twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/10/1996 | 0001 | 06/22/2000 | 2359 |
Subject: | TWP/C1 - Incorrect elevation reported in Manus Data |
DataStreams: | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1, twpsmet60sC1.a1, twpsmet60sC1.b1 |
Description: | (From Bill Clements) We have been using 6m MSL as the station elevation of Momote (Manus). This was based on information posted near the station barometer in the Momote Weather Service Office. It turns out that the official WMO station elevation for Momote is 4m MSL and the upper air elevation is 5m MSL. All Manus instruments except the sonde station are at 4m MSL. The sonde launching station is at 5m MSL. |
Measurements: | twpgndrad20sC1.a1:
twpgndrad60sC1.b1:
twpsmet60sC1.b1:
twpgndrad60sC1.a1:
twpsmet60sC1.a1:
|
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 |
---|---|---|---|
04/01/2001 | 0005 | 03/03/2003 | 2102 |
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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/12/2002 | 0738 | 03/01/2003 | 2359 |
Subject: | TWP/SKYRAD/C3 - IRT incorrect min/delta values |
DataStreams: | twpskyrad60sC3.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: | twpskyrad60sC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/10/1996 | 0000 | 10/19/2001 | 2359 |
Subject: | TWP/SKYRAD/C1 - IRT affected by rain or shutter |
DataStreams: | twpskyrad60sC1.b1 |
Description: | During this time period, the SKYRAD IRT was affected by rain events. Water collected on the IRT lens resulting in elevated and invalid measurement of the sky brightness temperature. If the front optic was not dried after a heavy rain, the data contamination could persist for several days. The original solution to the problem was to have the local observers clean the front lens after rains. In April 1998, a rain shutter was installed, but it did not become fully functional until Aug 9, 1998. After the rain shutter was installed, the IRT data was invalid during rain events while the shutter was closed but ok again immediately after the shutter re-opened. The configuration of the IRT was changed Oct 19, 2001. The IRT was mounted such that the field of view is directed downward at a 30 degree elevation angle and reflected to the vertical by a front-surfaced, gold-plated mirror. This configuration prevents rain from directly striking the lens and collecting in the lens barrel. Data from 10/96-3/99 were examined and times when the data are invalid are identified below. Data from 4/99-10/01 also contain periods of invalid data, but it is left to the data users to identify those periods and filter the data according to their needs. 10/12/96 21:00 - 10/14/96 00:00 10/16/96 13:00 - 10/16/96 21:00 10/21/96 04:00 - 10/21/96 23:00 11/09/96 06:00 - 11/09/96 22:00 11/10/96 08:00 - 11/11/96 03:00 11/23/96 17:00 - 11/24/96 03:00 11/25/96 00:00 - 11/25/96 14:00 12/06/96 17:00 - 12/06/96 22:00 12/07/96 01:00 - 12/07/96 06:00 12/11/96 21:00 - 12/11/96 23:00 12/12/96 05:00 - 12/12/96 18:00 12/16/96 03:00 - 12/16/96 23:00 12/19/96 02:00 - 12/20/96 03:00 12/21/96 10:00 - 12/22/96 03:00 12/22/96 20:00 - 12/23/96 07:00 12/27/96 01:00 - 12/27/96 11:00 12/30/96 06:00 - 12/30/96 23:00 01/01/97 21:00 - 01/02/97 01:00 01/10/97 01:00 - 01/10/97 09:00 01/12/97 06:00 - 01/12/97 23:59 01/14/97 01:00 - 01/15/97 23:00 01/17/97 01:00 - 01/17/97 10:00 01/18/97 18:00 - 01/18/97 23:59 01/19/97 17:00 - 01/19/97 23:00 01/20/97 10:00 - 01/21/97 02:00 01/27/97 15:00 - 01/27/97 23:59 01/30/97 16:00 - 01/30/97 23:59 02/01/97 03:00 - 02/01/97 13:00 02/02/97 05:00 - 02/03/97 01:00 02/09/97 00:00 - 02/09/97 03:00 02/10/97 04:00 - 02/11/97 07:00 02/12/97 11:00 - 02/12/97 22:00 02/15/97 00:00 - 02/15/97 03:00 02/16/97 06:00 - 02/16/97 20:00 02/17/97 10:00 - 02/18/97 01:00 02/18/97 04:00 - 02/19/97 23:00 02/24/97 00:00 - 02/24/97 21:00 02/25/97 03:00 - 02/25/97 09:00 02/26/97 01:00 - 02/26/97 07:00 03/01/97 01:00 - 03/01/97 12:00 03/26/97 01:00 - 03/27/97 03:00 04/07/97 13:00 - 04/08/97 02:00 04/11/97 03:00 - 04/11/97 06:00 04/12/97 00:00 - 04/12/97 05:00 04/12/97 12:00 - 04/12/97 18:00 04/15/97 15:00 - 04/15/97 19:00 04/15/97 22:00 - 04/16/97 10:00 04/16/97 12:00 - 04/16/97 23:59 04/22/97 15:00 - 04/22/97 21:00 04/27/97 18:00 - 04/27/97 21:00 04/29/97 13:00 - 04/29/97 20:00 05/01/97 04:00 - 05/01/97 23:00 05/03/97 03:00 - 05/03/97 20:00 05/13/97 13:00 - 05/14/97 23:00 05/16/97 19:00 - 05/16/97 23:59 05/18/97 06:00 - 05/18/97 21:00 05/20/97 02:00 - 05/20/97 21:00 05/22/97 02:00 - 05/22/97 21:00 05/25/97 03:00 - 05/25/97 23:00 05/26/97 04:00 - 05/26/97 11:00 05/27/97 04:00 - 05/27/97 07:00 06/24/97 13:00 - 06/24/97 21:00 06/30/97 19:00 - 07/01/97 06:00 07/04/97 03:00 - 07/04/97 23:59 07/07/97 15:00 - 07/08/97 20:00 07/11/97 13:00 - 07/11/97 21:00 07/12/97 10:00 - 07/12/97 20:00 07/15/97 19:00 - 07/16/97 21:00 07/17/97 18:00 - 07/18/97 05:00 07/18/97 12:00 - 07/19/97 21:00 07/21/97 06:00 - 07/21/97 23:00 08/06/97 21:00 - 08/07/97 07:00 08/07/97 15:00 - 08/07/97 23:00 08/26/97 08:00 - 08/26/97 17:00 09/23/97 20:00 - 09/23/97 21:00 09/25/97 04:00 - 09/25/97 09:00 09/25/97 21:00 - 09/25/97 23:59 10/01/97 03:00 - 10/01/97 06:00 10/12/97 02:00 - 10/12/97 05:00 10/12/97 08:00 - 10/12/97 22:00 10/13/97 06:00 - 10/13/97 17:00 10/22/97 02:00 - 10/22/97 05:00 10/25/97 22:00 - 10/26/97 05:00 10/27/97 07:00 - 10/27/97 23:00 11/02/97 00:00 - 11/02/97 23:59 11/16/97 04:00 - 11/16/97 08:00 11/16/97 18:00 - 11/16/97 22:00 11/18/97 15:00 - 11/18/97 22:00 11/30/97 03:00 - 11/30/97 20:00 12/17/97 18:00 - 12/18/97 23:00 12/21/97 03:00 - 12/21/97 05:00 12/25/97 02:00 - 12/25/97 08:00 12/26/97 18:00 - 12/27/97 01:00 12/28/97 01:00 - 12/28/97 20:00 12/30/97 09:00 - 12/30/97 23:00 01/03/98 04:00 - 01/03/98 05:00 01/04/98 05:00 - 01/05/98 02:00 02/04/98 19:00 - 02/04/98 23:00 02/05/98 04:00 - 02/06/98 19:00 02/07/98 16:00 - 02/08/98 03:00 02/08/98 12:00 - 02/08/98 21:00 02/09/98 06:00 - 02/10/98 04:00 02/20/98 19:00 - 02/20/98 23:59 02/22/98 09:00 - 02/22/98 21:00 03/16/98 00:00 - 03/16/98 02:00 03/17/98 19:00 - 03/17/98 23:59 03/28/98 15:00 - 03/31/98 03:00 03/31/98 10:00 - 03/31/98 22:00 04/01/98 00:00 - 04/01/98 03:18 04/01/98 06:45 - 04/01/98 10:06 04/02/98 00:28 - 04/05/98 03:45 04/05/98 19:25 - 04/05/98 23:54 04/09/98 00:45 - 04/09/98 16:54 04/10/98 15:15 - 04/10/98 19:28 04/11/98 04:24 - 04/11/98 05:34 04/11/98 06:56 - 04/11/98 23:28 04/12/98 00:15 - 04/12/98 01:56 04/12/98 04:15 - 04/12/98 05:37 04/12/98 15:37 - 04/12/98 16:57 04/12/98 17:15 - 04/12/98 21:37 04/13/98 01:37 - 04/13/98 14:45 04/19/98 05:25 - 04/19/98 06:08 04/19/98 20:15 - 04/19/98 22:15 04/21/98 08:57 - 04/22/98 03:45 04/23/98 21:45 - 04/23/98 21:56 04/27/98 17:56 - 04/27/98 22:08 04/28/98 05:45 - 04/28/98 20:36 04/28/98 23:45 - 04/29/98 05:58 04/30/98 10:57 - 04/30/98 21:58 05/01/98 08:08 - 05/02/98 00:08 05/02/98 07:45 - 05/02/98 22:08 05/03/98 08:35 - 05/03/98 22:55 05/04/98 08:16 - 05/04/98 21:55 05/05/98 07:33 - 05/05/98 22:08 05/06/98 07:55 - 05/06/98 22:07 05/07/98 07:55 - 05/07/98 12:33 05/07/98 13:08 - 05/07/98 22:26 05/08/98 02:45 - 05/08/98 03:08 05/08/98 03:34 - 05/08/98 04:16 05/09/98 02:26 - 05/09/98 02:56 05/09/98 20:55 - 05/09/98 21:08 05/09/98 21:45 - 05/09/98 23:35 05/10/98 15:45 - 05/10/98 18:35 05/11/98 22:08 - 05/11/98 22:45 05/12/98 01:34 - 05/12/98 02:26 05/12/98 13:09 - 05/12/98 20:45 05/13/98 00:25 - 05/13/98 04:28 05/13/98 11:15 - 05/13/98 12:57 05/13/98 13:26 - 05/13/98 18:19 05/13/98 19:45 - 05/14/98 22:08 05/16/98 00:15 - 05/16/98 05:15 05/16/98 07:04 - 05/17/98 01:55 05/17/98 05:25 - 05/17/98 06:33 05/19/98 21:16 - 05/19/98 22:16 05/19/98 22:57 - 05/19/98 23:35 05/21/98 16:57 - 05/21/98 21:15 05/21/98 23:56 - 05/22/98 00:45 05/22/98 01:25 - 05/22/98 02:04 05/22/98 19:15 - 05/22/98 21:56 05/23/98 06:25 - 05/23/98 07:07 05/24/98 06:25 - 05/24/98 07:45 05/24/98 10:45 - 05/24/98 21:33 05/25/98 07:57 - 05/25/98 17:26 05/26/98 19:15 - 05/27/98 00:26 05/27/98 04:35 - 05/27/98 12:26 05/29/98 12:05 - 05/29/98 22:15 05/30/98 01:25 - 05/30/98 02:04 06/01/98 15:57 - 06/01/98 21:45 06/02/98 04:15 - 06/02/98 23:34 06/03/98 04:55 - 06/03/98 05:45 06/03/98 07:45 - 06/03/98 11:17 06/03/98 20:58 - 06/03/98 22:58 06/04/98 01:45 - 06/04/98 02:03 06/04/98 07:45 - 06/04/98 09:15 06/04/98 20:29 - 06/04/98 21:15 06/05/98 02:15 - 06/05/98 03:26 06/05/98 05:15 - 06/05/98 13:26 06/05/98 15:26 - 06/06/98 00:05 06/06/98 08:35 - 06/06/98 20:35 06/06/98 21:56 - 06/06/98 22:26 06/07/98 06:45 - 06/07/98 13:45 06/07/98 20:57 - 06/07/98 23:45 06/08/98 00:29 - 06/08/98 01:29 06/08/98 19:29 - 06/08/98 20:58 06/09/98 03:25 - 06/09/98 03:45 06/09/98 06:35 - 06/09/98 06:58 06/09/98 15:42 - 06/09/98 16:58 06/10/98 09:35 - 06/10/98 21:34 06/13/98 02:25 - 06/14/98 03:05 06/13/98 04:45 - 06/13/98 05:26 06/13/98 20:06 - 06/13/98 23:25 06/13/98 23:45 - 06/14/98 00:15 06/14/98 03:25 - 06/14/98 03:45 06/14/98 15:15 - 06/14/98 18:24 06/14/98 20:55 - 06/14/98 21:15 06/16/98 18:34 - 06/16/98 22:36 06/17/98 06:55 - 06/17/98 08:04 06/17/98 09:54 - 06/17/98 10:26 06/18/98 04:26 - 06/18/98 05:05 06/18/98 05:45 - 06/18/98 07:26 06/18/98 12:58 - 06/18/98 13:16 06/18/98 14:15 - 06/18/98 23:56 06/19/98 00:26 - 06/19/98 00:56 06/19/98 02:15 - 06/19/98 03:04 06/19/98 03:25 - 06/19/98 06:56 06/19/98 07:25 - 06/19/98 08:56 06/19/98 11:45 - 06/20/98 13:46 06/20/98 16:29 - 06/20/98 20:45 06/20/98 23:58 - 06/21/98 01:15 06/22/98 03:45 - 06/22/98 04:34 06/22/98 05:45 - 06/22/98 16:34 06/22/98 19:45 - 06/23/98 01:05 06/23/98 02:04 - 06/23/98 02:55 06/23/98 03:45 - 06/23/98 05:05 06/23/98 05:45 - 06/23/98 07:17 06/23/98 22:06 - 06/24/98 16:25 06/24/98 22:36 - 06/24/98 23:25 06/25/98 00:05 - 06/25/98 00:34 06/27/98 00:55 - 06/27/98 01:16 06/27/98 05:45 - 06/27/98 06:05 06/27/98 21:25 - 06/28/98 08:05 06/28/98 12:26 - 06/28/98 13:45 06/30/98 10:58 - 06/30/98 13:05 06/30/98 13:15 - 06/30/98 17:45 06/30/98 18:15 - 06/30/98 21:45 07/01/98 08:26 - 07/01/98 22:05 07/02/98 11:33 - 07/02/98 21:33 07/03/98 17:33 - 07/03/98 21:45 07/04/98 15:57 - 07/04/98 16:45 07/04/98 21:57 - 07/04/98 22:25 07/05/98 07:15 - 07/05/98 22:56 07/05/98 23:05 - 07/06/98 00:05 07/06/98 03:54 - 07/06/98 06:04 07/06/98 07:04 - 07/06/98 10:04 07/06/98 16:45 - 07/06/98 21:15 07/07/98 04:56 - 07/07/98 05:56 07/07/98 06:26 - 07/07/98 06:56 07/07/98 07:45 - 07/07/98 08:34 07/08/98 01:45 - 07/08/98 02:34 07/08/98 02:56 - 07/08/98 03:27 07/08/98 08:26 - 07/08/98 15:08 07/08/98 16:06 - 07/08/98 16:45 07/08/98 17:28 - 07/08/98 19:28 07/09/98 15:55 - 07/09/98 18:03 07/09/98 21:25 - 07/09/98 22:25 07/09/98 23:05 - 07/09/98 23:45 07/10/98 02:25 - 07/10/98 03:58 07/10/98 23:29 - 07/10/98 23:45 07/12/98 09:25 - 07/12/98 09:45 07/12/98 10:25 - 07/12/98 21:15 07/13/98 01:34 - 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Measurements: | twpskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/1996 | 1943 | 12/09/1998 | 0000 |
Subject: | TWP/GNDRAD/C1 - Incorrect dome calibration factor |
DataStreams: | twpgndrad20sC1.a1, twpgndrad60sC1.a1, twpgndrad60sC1.b1 |
Description: | The Manus GNDRAD PIR had an incorrect dome factor since installation. The following is an estimate by Chris Cornwall of the magnitude of the effect of this calibration error. The magnitude of this error is smaller than the calibration accuracy. "Processed the instantaneous data from ARCS2 (10, 30 and 50 seconds after the minute) using 4.32 as the dome factor, and also using 4.00 as the dome factor, as it should have been. The difference between the calculated irradiance results was negligible, as was expected with an instrument operating in the downward-facing direction. Over the three days from 11/06/98 to 11/08/98, the error between the two signals averaged 0.09%. Overnight values were much lower than this, daytime values peaked at 0.42%. The statistics for these error signals were as follows: average error 0.000895 standard dev 0.001119 max error 0.004242 min error -0.00064 We should change ARCS1 so it is using the correct value for the groundrad pir dome coefficient (4.0 instead of 4.32), and we may want to include a DQR stating these findings, although they are much smaller than the overall uncertainty of the PIR itself." |
Measurements: | twpgndrad20sC1.a1:
twpgndrad60sC1.b1:
twpgndrad60sC1.a1:
|