| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D010201.1 | NSA/MWR/C1 - Temperature Stabilization of Noise Diode Impaired | nsamwrlosC1.a1, nsamwrlosC1.b1, nsa5mwravgC1.c1 |
| D010504.4 | NSA/MWR/C1 - Reprocess: calibration change | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
| D020122.1 | NSA/MWR/C1 - Reprocess: wrong calibration | nsamwrlosC1.a1, nsamwrlosC1.b1 |
| D021017.1 | NSA/MWR/C1 - MWR digital board failure | nsamwrlosC1.a1, nsamwrlosC1.b1 |
| D030312.6 | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures | nsamwrlosC1.a1, nsamwrlosC1.b1 |
| D030515.3 | NSA/MWR/C1 - no air temperature signal | nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1 |
| D030822.7 | NSA/MWR/C1 - min/max/delta values incorrect | nsamwrlosC1.b1 |
| D040116.1 | NSA/MWR/C1 - damaged window | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1 |
| D050112.1 | NSA/C1 - Site-wide power failure | nsamplC1.a1, nsamwrpC1.b1, nsamplpsC1.a0, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaaerich1C1.b1, nsaaerich2C1.b1, nsammcrmomC1.b1, nsamettwr4hC1.b1, nsavceil25kC1.b1, nsatwrcam40mC1.a1, nsaaerisummaryC1.b1, nsaaeriengineerC1.b1, nsa915rwptempconC1.a1, nsa915rwptempmomC1.a0, nsa915rwpwindconC1.a1, nsa915rwpwindmomC1.a0, nsa915rwptempspecC1.a0, nsa915rwpwindspecC1.a0 |
| D050725.7 | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsa5mwravgC1.c1, nsaqmemwrcolC1.c1 |
| D050928.3 | NSA/MWR/C1 - New software version (4.15) installed | nsamwrlosC1.b1, nsamwrtipC1.a1 |
| D101025.1 | NSA/MWR/C1 - Missing data | nsamwrlosC1.b1, nsamwrtipC1.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/17/2001 | 0600 | 01/22/2001 | 2145 |
| Subject: | NSA/MWR/C1 - Temperature Stabilization of Noise Diode Impaired |
| DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsa5mwravgC1.c1 |
| Description: | On 1/17 we had a big spike in the data and lost temperature stabilization. The instrument had problems maintaining the Noise Diode (ND) temperature since. At ambient temperatures under about -20 C the ND was not maintaining the set temperature of 30 C. This problem was reported in P010122.1. Fred Solheim recommended on 1/22 that we powercycle the instrument as it looked like the instrument CPU had lost the temperature reference. So we powercycled the instrument on 1/22 @ 20:30 and lost all comumnication to it; after a second powercycling the instrument came back on line and the temperature stabilized quickly (within a couple of minutes) to the set temperature (30 C) Fred Solheim reported after the system was restored: "I've never seen this behavior before. I don't think it was due to the RF deck physically hanging temperature, because the recorded temp dropped about 30 C in one observation cycle. If this happens again, send the MWR down along with data files for us to look at." Data collected in the periode 1/17/2001 6:00 to 1/22/2001 21:45 are questionable since it is uncertain whether the temperature really was unstable and what really caused the problem. |
| Measurements: | nsa5mwravgC1.c1:
nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
| 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 |
|---|---|---|---|
| 09/27/2001 | 1900 | 09/29/2001 | 1000 |
| Subject: | NSA/MWR/C1 - Reprocess: wrong calibration |
| DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
| Description: | Moisture was found inside the lens of the MWR. Removal of the moisture caused a significant change in the calibration, especially in the 23.8 GHz channel. The calibration was updated automatically. |
| Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/04/2002 | 0824 | 03/16/2002 | 0056 |
| Subject: | NSA/MWR/C1 - MWR digital board failure |
| DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
| Description: | A power failure at the site apparently damaged some of the components of the digital board. The MWR was replaced with a spare unit and returned to the manufacturer for repair. |
| Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/07/1999 | 1800 | 09/16/2002 | 1820 |
| Subject: | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures |
| DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
| Description: | Several related and recurring problems with the MWRs have been reported dating back to 1999. These problems were due to the occurrence of blackbody signals (in counts) that were half of those expected. The symptoms included noisy data, spikes in the data, negative brightness temperatures, and apparent loss of serial communication between the computer and the radiometer, which results in a self-termination of the MWR program. Because these all initially appeared to be hardware-related problems, the instrument mentor and site operations personnel (1) repeatedly cleaned and replaced the fiber optic comm. components, (2) swapped radiometers, (3) sent radiometers back to Radiometrics for evaluation (which did not revealed any instrument problems), and (4) reconfigured the computer's operating system. Despite several attempts to isolate and correct it, the problem persisted. It became apparent that some component of the Windows98 configuration conflicted with the DOS-based MWR program or affected the serial port or the contents of the serial port buffer. This problem was finally corrected by upgrading the MWR software with a new Windows-compatible program. |
| Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/13/2003 | 1906 | 01/15/2005 | 0054 |
| Subject: | NSA/MWR/C1 - no air temperature signal |
| DataStreams: | nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1 |
| Description: | When the new blower was upgraded by Radiometrics and reinstalled on the MWR, the air temperature sensor failed to properly report. It was determined that the wires carrying the signal to the analog board did not conform to the standard expected by the upgraded blower. The problem was corrected by changing the wiring and modifying the MWR software to read the signal from the appropriate corresponding channel. |
| Measurements: | nsamwrlosC1.b1:
nsamwrC1.00:
nsamwrtipC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/02/1998 | 0000 | 02/08/2003 | 2359 |
| Subject: | NSA/MWR/C1 - min/max/delta values incorrect |
| DataStreams: | nsamwrlosC1.b1 |
| Description: | The values of valid_min, valid_max, and valid_delta for fields tkxc and tknd were incorrect. They should be 303, 333, and 0.5 K, respectively. |
| Measurements: | nsamwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/07/2004 | 2007 | 01/09/2004 | 0032 |
| Subject: | NSA/MWR/C1 - damaged window |
| DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1 |
| Description: | The MWR dielectric window was damaged by snow from a snow blower and replaced. |
| Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsaqmemwrcolC1.c1:
nsamwrtipC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/13/2004 | 1000 | 12/13/2004 | 2330 |
| Subject: | NSA/C1 - Site-wide power failure |
| DataStreams: | nsamplC1.a1, nsamwrpC1.b1, nsamplpsC1.a0, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaaerich1C1.b1, nsaaerich2C1.b1, nsammcrmomC1.b1, nsamettwr4hC1.b1, nsavceil25kC1.b1, nsatwrcam40mC1.a1, nsaaerisummaryC1.b1, nsaaeriengineerC1.b1, nsa915rwptempconC1.a1, nsa915rwptempmomC1.a0, nsa915rwpwindconC1.a1, nsa915rwpwindmomC1.a0, nsa915rwptempspecC1.a0, nsa915rwpwindspecC1.a0 |
| Description: | The Barrow facility experienced a site-wide power failure on 12/13. Power was restored to most instruments between 2250 and 2330 GMT. |
| Measurements: | nsa915rwpwindspecC1.a0:
nsa915rwpwindconC1.a1:
nsaaerich2C1.b1:
nsamwrlosC1.b1:
nsaaerisummaryC1.b1:
nsa915rwptempmomC1.a0:
nsaaerich1C1.b1:
nsamplpsC1.a0:
nsavceil25kC1.b1:
nsa915rwptempspecC1.a0:
nsa915rwptempconC1.a1:
nsaaeriengineerC1.b1:
nsamplC1.a1:
nsammcrmomC1.b1:
nsamettwr4hC1.b1:
nsamwrpC1.b1:
nsa915rwpwindmomC1.a0:
nsamwrtipC1.a1:
nsatwrcam40mC1.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: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsa5mwravgC1.c1, 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: | nsa5mwravgC1.c1:
nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsaqmemwrcolC1.c1:
nsamwrtipC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/16/2002 | 1820 | 09/15/2005 | 1702 |
| Subject: | NSA/MWR/C1 - New software version (4.15) installed |
| DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
| Description: | A problem began with the installation of MWR.EXE version 4.12 in September 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 9/15/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
| Measurements: | nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/08/1998 | 1459 | 02/11/1998 | 2254 |
| 02/13/1998 | 1359 | 02/22/1998 | 2022 |
| 03/06/1998 | 1846 | 03/14/1998 | 0200 |
| 03/15/1998 | 2322 | 03/19/1998 | 0053 |
| 04/24/1998 | 1838 | 04/29/1998 | 2340 |
| 05/03/1998 | 1203 | 05/11/1998 | 2137 |
| 05/30/1998 | 1840 | 06/01/1998 | 1858 |
| 06/09/1998 | 2338 | 06/16/1998 | 2243 |
| 07/13/1998 | 0103 | 07/16/1998 | 1816 |
| 07/18/1998 | 1904 | 07/27/1998 | 2133 |
| 07/29/1998 | 0828 | 08/03/1998 | 1901 |
| 08/05/1998 | 0028 | 09/24/1998 | 2042 |
| 09/24/1998 | 2210 | 11/11/1998 | 1830 |
| 11/11/1998 | 1831 | 11/18/1998 | 1929 |
| 01/02/1999 | 0947 | 01/04/1999 | 1756 |
| 10/11/1999 | 2359 | 10/13/1999 | 2200 |
| 11/17/1999 | 0043 | 11/19/1999 | 0033 |
| 01/28/2000 | 1929 | 01/31/2000 | 1754 |
| 12/22/2000 | 2300 | 01/09/2001 | 2233 |
| 03/28/2001 | 2359 | 04/01/2001 | 0001 |
| 08/09/2001 | 0000 | 08/13/2001 | 0000 |
| 08/15/2001 | 0000 | 08/20/2001 | 0000 |
| 12/30/2001 | 2359 | 01/01/2002 | 0000 |
| 02/14/2002 | 2159 | 02/25/2002 | 2009 |
| 02/27/2002 | 0700 | 03/02/2002 | 0100 |
| 04/25/2002 | 1855 | 05/08/2002 | 2138 |
| 05/08/2002 | 2144 | 05/23/2002 | 1925 |
| 08/19/2002 | 1656 | 08/21/2002 | 1925 |
| 12/05/2002 | 2253 | 12/08/2002 | 2120 |
| 06/29/2003 | 1630 | 07/01/2003 | 2233 |
| 08/09/2003 | 0459 | 08/11/2003 | 1807 |
| 02/10/2004 | 0845 | 02/17/2004 | 0156 |
| 07/10/2004 | 2255 | 07/12/2004 | 1918 |
| 08/05/2005 | 1952 | 09/01/2005 | 1945 |
| 09/22/2005 | 0545 | 09/27/2005 | 2357 |
| 02/25/2006 | 0811 | 02/27/2006 | 1827 |
| 09/17/2009 | 2241 | 09/20/2009 | 1734 |
| 09/27/2010 | 0254 | 10/01/2010 | 1924 |
| 04/27/2011 | 1800 | 05/03/2011 | 1900 |
| Subject: | NSA/MWR/C1 - Missing data |
| DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
| Description: | Data are missing and unrecoverable. |
| Measurements: | nsamwrlosC1.b1:
nsamwrtipC1.a1:
|