| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D011005.6 | SGP/MWR/E14 - Upgrade of Arm Core PC Configuration | sgpmwrlosE14.a1, sgpmwrlosE14.b1, sgpmwrtipE14.a1 |
| D020117.22 | SGP/MWR/E14 - Incorrect azimuth value reported | sgpmwrtipE14.a1 |
| D020119.1 | SGP/MWR/E14 - Hard disk failure | sgpmwrE14.00, sgpmwrlosE14.a1, sgpmwrlosE14.b1, sgpmwrtipE14.a1 |
| D050725.6 | SGP/MWR/E14 - Reprocess: Revised Retrieval Coefficients | sgpmwrlosE14.a1, sgpmwrlosE14.b1, sgpmwrtipE14.a1, sgpqmemwrcolE14.c1 |
| D051011.3 | SGP/MWR/E14 - New software version (4.15) installed | sgpmwrlosE14.b1, sgpmwrtipE14.a1 |
| D070802.3 | SGP/MWR/C1 - Noisy data | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D071128.2 | SGP/MWR/C1 - Reprocess: Radiometer reinstalled- Please reprocess | sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D081013.5 | SGP/MWR/C1 - Increased noise in 31.4 GHz channel | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/26/2001 | 1700 | 09/26/2001 | 1823 |
| Subject: | SGP/MWR/E14 - Upgrade of Arm Core PC Configuration |
| DataStreams: | sgpmwrlosE14.a1, sgpmwrlosE14.b1, sgpmwrtipE14.a1 |
| Description: | Upgrade of Arm Core PC configuration to version 2.6B per ECO 407. Data collection was temporarily interrupted. |
| Measurements: | sgpmwrlosE14.a1:
sgpmwrtipE14.a1:
sgpmwrlosE14.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/20/2001 | 1642 | 09/26/2001 | 1458 |
| Subject: | SGP/MWR/E14 - Incorrect azimuth value reported |
| DataStreams: | sgpmwrtipE14.a1 |
| Description: | On 7/18/01, the hard disk of the MWR laptop failed. The hard disk was replaced and reconfigured with the Core PC Configuration on 7/20. Unfortunately, the MWR configuration file that I supplied had a tip azimuth angle set incorrectly to 0 degrees instead of 270. Site Operations compensated for the configuration file error by physically reorienting the azimuth drive so that a "0 degree" command actually oriented the MWR to 270 degrees which is the desired azimuth for tip mode. Therefore, the tip data, except the reported azimuth values, were not affected because the instrument was scanning properly at 270 degrees. The LOS azimuth angle in the configurations file was set correctly to 270 degrees but because of the physical reorientation of the instrument it should have been reported as 180. This condition ended on 9/26/01 by physically correcting the orientation of the azimuth drive to 0 degrees and by correcting the tip azimuth angle in the configuration file to 270 degrees. During this period, field actaz in sgpmwrtipE14 should be 270 instead of 0 and the global attribute azimuth in sgpmwrlosE14 header should be 180 instead of 270. |
| Measurements: | sgpmwrtipE14.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/17/2001 | 2300 | 07/20/2001 | 1640 |
| Subject: | SGP/MWR/E14 - Hard disk failure |
| DataStreams: | sgpmwrE14.00, sgpmwrlosE14.a1, sgpmwrlosE14.b1, sgpmwrtipE14.a1 |
| Description: | The hard disk of the MWR laptop failed 7/17 and was replaced 7/20. The ARM Core PC Configuration and MWR configuration files were installed on the new hard disk. |
| Measurements: | sgpmwrE14.00:
sgpmwrlosE14.a1:
sgpmwrtipE14.a1:
sgpmwrlosE14.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/16/2002 | 0000 | 06/28/2005 | 2300 |
| Subject: | SGP/MWR/E14 - Reprocess: Revised Retrieval Coefficients |
| DataStreams: | sgpmwrlosE14.a1, sgpmwrlosE14.b1, sgpmwrtipE14.a1, sgpqmemwrcolE14.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 SGP.E14 20020416.0000. The MONORTM-based retrieval coefficients became active at SGP.E14 20050628.2300. 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: | sgpmwrlosE14.a1:
sgpmwrtipE14.a1:
sgpmwrlosE14.b1:
sgpqmemwrcolE14.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/01/2002 | 1458 | 08/01/2005 | 2306 |
| Subject: | SGP/MWR/E14 - New software version (4.15) installed |
| DataStreams: | sgpmwrlosE14.b1, sgpmwrtipE14.a1 |
| Description: | A problem began with the installation of MWR.EXE version 4.12 in May 2002. The software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier problem. The software upgrade corrected the earlier problem but introduced a new one that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these problems. The new MWR software, version 4.15, was installed on 8/1/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
| Measurements: | sgpmwrtipE14.a1:
sgpmwrlosE14.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/14/2007 | 0000 | 08/03/2007 | 1508 |
| Subject: | SGP/MWR/C1 - Noisy data |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | Since 7/14 the MWR is experiencing intermittent periods of increased noise. The cause for this is under investigation. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/19/2007 | 2136 | 11/22/2007 | 1400 |
| Subject: | SGP/MWR/C1 - Reprocess: Radiometer reinstalled- Please reprocess |
| DataStreams: | sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | After the radiometer was reinstalled it had to update the calibration coefficients. Data will be reprocessed |
| Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/01/2008 | 0000 | 11/30/2008 | 2300 |
| Subject: | SGP/MWR/C1 - Increased noise in 31.4 GHz channel |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | The 31.4 GHz channel has been showing an increased level of noise which results in increased noise in the LWP retrievals. The instrument is tipping and all other parameters seem to be in the range. The elevate noise started in May, but it seems to have become slightly worse after summer. After November the noise level seems to have gone back to normal. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|