DQR ID | Subject | Data Streams Affected |
---|---|---|
D010202.6 | NSA/MWR/C1 - incorrect flagging of data | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D010202.7 | NSA/MWR/C1 - incorrect flagging of data | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D010216.2 | NSA/MWR/C1 - NSA Barrow MWR down due to PC Virus | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsamwrtipC1.b1 |
D010504.4 | NSA/MWR/C1 - Reprocess: calibration change | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D030115.1 | NSA/MWR/C1 - REPROCESS: Wrong Calibration | nsamwrlosC1.a1, nsamwrtipC1.a1 |
D050725.7 | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients | nsa5mwravgC1.c1, nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/11/2000 | 0000 | 11/20/2000 | 2359 |
Subject: | NSA/MWR/C1 - incorrect flagging of data |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The wet window flag is set high more than expected. |
Measurements: | nsamwrlosC1.a1:
nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/07/2000 | 0000 | 12/22/2000 | 2359 |
Subject: | NSA/MWR/C1 - incorrect flagging of data |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The wet window flag is set high more frequent than expected. |
Measurements: | nsamwrlosC1.a1:
nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/22/2000 | 2300 | 01/09/2001 | 2230 |
Subject: | NSA/MWR/C1 - NSA Barrow MWR down due to PC Virus |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsamwrtipC1.b1 |
Description: | On 12/22 at 23:00 the PC communication hung. Before operators returned to work after the holidays on 12/26, the virus W32.kriz triggered on 12/25 at 1:43 GMT. This virus wiped out large amount of files, hereunder the data files from the period 12/22 23:00 - 12/25 01:00 and OS system files. The fixed PC was re-installed on 1/5, due issues with using serial ports under DOS comunication with instrument was not restored until 1/9 @ 22:30 GMT |
Measurements: | nsamwrlosC1.a1:
nsamwrtipC1.b1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/31/2001 | 0900 | 02/06/2001 | 0237 |
Subject: | NSA/MWR/C1 - Reprocess: calibration change |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The computer was replaced but not configured correctly for the MWR. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/25/2002 | 1930 | 05/27/2002 | 1200 |
Subject: | NSA/MWR/C1 - REPROCESS: Wrong Calibration |
DataStreams: | nsamwrlosC1.a1, nsamwrtipC1.a1 |
Description: | When MWR#20 was returned to service on 4/25/02, the calibration had significantly changed as a result of the repairs made by Radiometrics. I hoped that the previous calibration was close enough to serve as a start of the iterative self-calibration process, but I was wrong. After several days and very little clear sky, no valid tip curves were obtained and the values of vap and liq continued to be too large and unrealistic (resulting in the "******" for these values in the raw file). Radiometrics finally provided the calibration they obtained after the repair and these values were put in the configuration file on 5/23/02. The instrument was then able to obtain valid tip curves and derive a new calibration. |
Measurements: | nsamwrlosC1.a1:
nsamwrtipC1.a1:
|
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: | nsa5mwravgC1.c1, nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, 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: | nsamwrlosC1.a1:
nsa5mwravgC1.c1:
nsaqmemwrcolC1.c1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|