| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D980205.2 | Manually corrected error in header files | sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0 |
| D980209.3 | SGP/MWR/B5 - Reprocess: Calibration update | sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0 |
| D980211.1 | SGP/MWR/B5 - Incorrect serial number | sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0 |
| D990106.2 | SGP/MWR/B5 - Software Change | sgpmwrlosB5.a1 |
| D990113.1 | SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27) | sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/27/1997 | 2000 | 11/10/1997 | 1940 |
| Subject: | Manually corrected error in header files |
| DataStreams: | sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0 |
| Description: | On 10/27/97 at 20:00 UTC, an error was made while remotely editing the MWR configuration file. This produced an error in the data file header which made the normal processing programs fail. The problem was identified on 11/10/97. The configuration file at BF1 was corrected on 11/11/97 at 19:40. MWR.BBF5 wasremoved from service on 11/5/97 17:54. The configuration file at BF5 was corrected prior to reinstalling the MWR on 1/9/98. The file headers of these data were reconstructed and the data were delivered to the Archive on 11/26/97 for MWR.BF1 and on 12/3/97 for MWR.BF5. This DQR is being filed to note that the headers were manually recreated. The data should be unaffected. This DQR is based on information obtained from Victor Morris and Robin Perez. |
| Measurements: | sgpmwrtipB5.a0:
sgpmwrlosB5.a1:
sgpmwrlosB1.a1:
sgpmwrlosB1.a0:
sgpmwrlosB5.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/09/1998 | 1757 | 02/09/1998 | 1659 |
| Subject: | SGP/MWR/B5 - Reprocess: Calibration update |
| DataStreams: | sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0 |
| Description: | With the MWR at Morris, there appears to be a very large (~0.5mm) positive bias in the LWP
and the PWV values are much larger (~4cm) than reported by the soundings. Recent repairs
by the manufacturer appear to have significantly changed the calibration.
The tip data acquired during the SCM IOP on 29-30 January at Morris have been reduced. It
was updated at 17:00 on 9 February. The calibration will be closely monitored to
determine if the previouly-reported (P971104.1) drift in the 31.4 GHz channel has been corrected.
The table below compares the latest calibration with previous ones.
23.8 GHz 31.4 GHz
----------------------- -----------------------
Date Location Tips Tnd(K) tc(K/K) err(K) Tnd(K) tc(K/K) err(K)
Jun 97 B5/Morris 2566 168.85 -0.071 0.33 186.15 -0.005 0.24
Aug 97 B5/Morris 1229 169.97 -0.103 0.31 188.45 -0.029 0.19
Nov 97 B5/Morris 3420 169.17 -0.082 0.24 188.76 +0.003 0.20
Jan 98 B5/Morris 2340 218.64 -0.107 0.23 219.41 +0.007 0.18
The data collected since the instrument was reinstalled on 9 January until the calibration
was updated will need to be reprocessed. |
| Measurements: | sgpmwrlosB5.a1:
sgpmwrtipB5.a0:
sgpmwrlosB5.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/16/1998 | 1907 | 02/10/1998 | 2359 |
| Subject: | SGP/MWR/B5 - Incorrect serial number |
| DataStreams: | sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrtipB5.a0 |
| Description: | The MWR serial number was changed from 012 to 001 in the configuration file while the instrument was off line for repairs and testing. This resulted in an incorrect serial number used in the filename extension of the raw data file and placed in the header of the cdf file. Data quality were not affected. |
| Measurements: | sgpmwrtipB5.a0:
sgpmwrlosB5.a1:
sgpmwrlosB5.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/12/1994 | 0000 | 02/10/1998 | 2359 |
| Subject: | SGP/MWR/B5 - Software Change |
| DataStreams: | sgpmwrlosB5.a1 |
| Description: | The MWR operating software was changed on 12 February 1998 to provide additional functionality as described below. This change affects the format of the raw and ingested data. NEW FEATURES 1. Faster sampling rate Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per blackbody sample and gain update.) 2. More flexible sampling strategy Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. This permits sky samples to be acquired at intervals of 2.67 seconds for improved temporal resolution of cloud liquid water variations and better coordination with the millimeter cloud radar during IOPs. 3. Separation of zenith LOS observations from TIP data When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV and LWP computed and reported separately in the output file. This eliminates the periods of missing LOS data during calibration checks/updates. 4. Automatic self-calibration The software now permits the calibration to be updated at specified intervals or continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified intervals or whenever clear sky conditions occur, the tip data reduced, the calibration updated, and the radiometer returned to LOS mode without operator intervention. In the second case, the radiometer is continuously is TIP mode until changed by the operator. 5. Graphical user display The graphical display is comprised of a status display, a message display, a temperature plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip curves. |
| Measurements: | sgpmwrlosB5.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/21/1993 | 1406 | 01/12/1999 | 2359 |
| Subject: | SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27) |
| DataStreams: | sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0 |
| Description: | At 00:00 GMT on 7 January version 3.27 of the MWR operating program was installed and made operational at the SGP central facility (C1). No problems were noted over the next few days and the boundary facility MWRs (B1, B4, B5, B6) were upgraded at 20:00 GMT on 11 January. This version includes a beam width correction I developed as well as providing the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) On 12 January I discovered that the '486-based MWR computers at B1, B4 and B6 were not executing the system command to move and rename the data files so that the ARM data system could retrieve them. Reducing the length of the storage arrays in the auto-leveling feature from 1000 to 250 resolved the problem. This results in the auto-leveling being based on only 4 hours of clear sky data rather than 16 hours at B5 and C1. This version of the program is 3.28. Version 3.27 (running at B5 and C1) can be installed if and when these computers are upgraded to Pentium-class machines. The improvement in the quality of the tip curves resulting from the auto-leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. The goodness-of-fit coefficient for the tip curves has improved from about 0.995 to over 0.998. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998. Editor's Note: The SGP.C1 data were reprocessed in 2004 to produce a common DOD for all time. The 1996-1998 data reprocessing included beam width and mirror-leveling corrections, but the data prior to that range did not have these corrections applied. |
| Measurements: | sgpmwrtipB1.a0:
sgpmwrlosB5.a1:
sgpmwrtipB5.a0:
sgpmwrlosB1.a1:
sgpmwrlosC1.b1:
sgpmwrtipB6.a0:
sgpmwrtipB4.a0:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
sgpmwrlosB6.a1:
|