DQR ID | Subject | Data Streams Affected |
---|---|---|
D010201.1 | NSA/MWR/C1 - Temperature Stabilization of Noise Diode Impaired | nsamwrlosC1.a1, nsamwrlosC1.b1, nsa5mwravgC1.c1 |
D010202.2 | NSA/MWR/C1 - negative sky brightness temperatures | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D010202.3 | NSA/MWR/C1 - negative sky brightness temperatures | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D010202.5 | NSA/MWR/C1 - Reprocess: calibration change | nsamwrlosC1.a1, nsamwrlosC1.b1 |
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 |
D020122.1 | NSA/MWR/C1 - Reprocess: wrong calibration | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.28 | NSA/MWR/C1 - Contamination or Calibration Effect | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.29 | NSA/MWR/C1 - Frosting | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.30 | NSA/MWR/C1 - Instrument maintenance | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.32 | NSA/MWR/C1 - MWR moved | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.33 | NSA/MWR/C1 - negative PWV (bad calibration?) | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.34 | NSA/MWR/C1 - Heater/blower removed | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.36 | NSA/MWR/C1 - Data spikes, possibly due to cleaning events | 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 |
D040225.5 | NSA/MWR/C1 - power supply failure | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
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 |
D050203.1 | NSA/MWR/C1 - poor air temperature values | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050725.7 | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsa5mwravgC1.c1, nsaqmemwrcolC1.c1 |
D050809.2 | NSA/MWR/C1 - Possible loss of accuracy due to missing blower | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050919.5 | NSA/MWR/C1 - Missing Data | nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1, nsa5mwravgC1.c1 |
D050920.2 | NSA/MWR/C1 - Instrument problem, Heater problem | nsamwrC1.00, nsamwrlosC1.b1 |
D050928.3 | NSA/MWR/C1 - New software version (4.15) installed | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050930.1 | NSA/MWR/C1 - Reprocess: wrong calibration | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D051020.1 | NSA/MWR/C1 - Incorrect time stamp | nsamwrC1.00, nsamwrlosC1.b1 |
D060420.8 | NSA/MWR/C1 - software upgrade (version 3.28) | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D060717.4 | NSA/MWR/C1 - TKAIR sensor failure | nsamwrlosC1.b1 |
D061114.1 | NSA/MWR/C1 - Rain sensor always on | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D990106.3 | NSA/MWR/C1 - Software Change | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D990114.1 | NSA/MWR/C1 - Spikes in PWV data | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D990114.2 | NSA/MWR/C1 - Spikes in PWV data | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D990114.3 | NSA/MWR/C1 - Reprocess: incorrect calibrations | nsamwrlosC1.00, nsamwrlosC1.a1, nsamwrlosC1.b1 |
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: | nsamwrlosC1.a1:
nsa5mwravgC1.c1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/03/2000 | 0000 | 05/24/2000 | 1800 |
Subject: | NSA/MWR/C1 - negative sky brightness temperatures |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The data exhibit occasional negative sky brightness temperatures. The problem was corrected when the site operator cleaned the cable connectors and coated the terminals with dielectric grease. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/10/2000 | 0000 | 12/21/2000 | 2359 |
Subject: | NSA/MWR/C1 - negative sky brightness temperatures |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The data exhibit occasional negative sky brightness temperatures. The problem was corrected when the computer was reconfigured following a virus infection. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/22/2000 | 2330 | 11/24/2000 | 1400 |
Subject: | NSA/MWR/C1 - Reprocess: calibration change |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The thicker (1/2-inch) insulation was installed on the RF deck and the reference temperature was reduced from 50 C to 30 C to prevent thermal instability in winter. A change in the mixer temperature affects the instrument's calibration. A new calibration was automatically derived and applied after 1500 valid tip curves were acquired. During the period after the temperature was reset and before the calibration was updated, the previous calibration was used. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
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 |
---|---|---|---|
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 |
---|---|---|---|
12/11/1998 | 1800 | 12/11/1998 | 1810 |
12/12/1998 | 1030 | 12/12/1998 | 1050 |
12/13/1998 | 1200 | 12/13/1998 | 1210 |
12/14/1998 | 1800 | 12/14/1998 | 1810 |
12/15/1998 | 1800 | 12/15/1998 | 1810 |
12/16/1999 | 2200 | 12/16/1999 | 2300 |
Subject: | NSA/MWR/C1 - Contamination or Calibration Effect |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | A short period of odd data occurs in PWV and the LWP. Its a sudden offset in the data values. Vic Morris suggests it could be a calibration issue as seen before at SGP. Data make a marked change after the events (suggesting the data were questionable prior to this time). No obvious changes in other instruments occur. Some of these effects may coincide with operator's preventive maintenance but others are in the middle of the night local time and can not be explained by cleaning. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/06/1999 | 1750 | 01/06/1999 | 1800 |
01/08/1999 | 1740 | 01/08/1999 | 1800 |
01/11/1999 | 1740 | 01/11/1999 | 1800 |
01/12/1999 | 1740 | 01/12/1999 | 1800 |
Subject: | NSA/MWR/C1 - Frosting |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Spike in PWV and LWP . Operator reports instrument is frosted. Instrument teflon window was cleaned by operator. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/21/1999 | 0000 | 09/21/1999 | 0030 |
Subject: | NSA/MWR/C1 - Instrument maintenance |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Installed cold weather insulation on radiometer, required time to thermally stabilize. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/27/1999 | 2230 | 02/27/1999 | 2300 |
Subject: | NSA/MWR/C1 - MWR moved |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The MWR data are unreasonable during this period, because it was shutdown and moved by operations at this time. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/24/1999 | 1145 | 01/24/1999 | 2100 |
Subject: | NSA/MWR/C1 - negative PWV (bad calibration?) |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | During this time, the PWV drops to slightly negative values. This could be related to calibration issues. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/08/1998 | 0000 | 01/22/1999 | 2359 |
Subject: | NSA/MWR/C1 - Heater/blower removed |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Note that the heater/blower was removed from the MWR during this time. This may impact snow removal from teflon window, thereby affecting the quality of the data between cleanings. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/16/1998 | 1800 | 12/16/1998 | 1815 |
10/25/1999 | 1800 | 10/25/1999 | 1810 |
11/04/1999 | 1900 | 11/04/1999 | 1910 |
12/15/1999 | 2140 | 12/15/1999 | 2210 |
02/29/2000 | 1850 | 02/29/2000 | 1900 |
04/04/2000 | 1800 | 04/04/2000 | 1830 |
04/06/2000 | 1815 | 04/06/2000 | 1830 |
04/23/2000 | 0810 | 04/23/2000 | 0830 |
05/16/2000 | 0430 | 05/16/2000 | 0500 |
05/16/2000 | 0630 | 05/16/2000 | 0700 |
05/16/2000 | 1530 | 05/16/2000 | 1545 |
05/24/2000 | 1800 | 05/24/2000 | 1815 |
Subject: | NSA/MWR/C1 - Data spikes, possibly due to cleaning events |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Unreasonable spikes occurred, which may be due to cleaning of the instrument by the operator. Other cleaning events did not result in obvious data spikes and have not been included in this report. |
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: | nsamwrC1.00:
nsamwrlosC1.b1:
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:
nsaqmemwrcolC1.c1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/10/2004 | 0847 | 02/17/2004 | 0156 |
Subject: | NSA/MWR/C1 - power supply failure |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The MWR failed due to infiltration of blowing snow which damaged the electronics. The digital and analog boards were replaced by new boards supplied by Radiometrics and the power supply was replaced by the unit from the spare MWR. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
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: | nsa915rwpwindconC1.a1:
nsatwrcam40mC1.a1:
nsa915rwptempconC1.a1:
nsa915rwpwindmomC1.a0:
nsamplC1.a1:
nsamplpsC1.a0:
nsamwrpC1.b1:
nsa915rwptempspecC1.a0:
nsa915rwptempmomC1.a0:
nsamettwr4hC1.b1:
nsaaeriengineerC1.b1:
nsaaerich2C1.b1:
nsaaerisummaryC1.b1:
nsamwrtipC1.a1:
nsavceil25kC1.b1:
nsa915rwpwindspecC1.a0:
nsamwrlosC1.b1:
nsaaerich1C1.b1:
nsammcrmomC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/15/2005 | 0054 | 01/19/2005 | 1143 |
Subject: | NSA/MWR/C1 - poor air temperature values |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | After the air temperature sensor was rewired due to a change with the new blower (D030515.3), the measurement was initially incorrect. There is no apparent cause for the bad signal or its improvement. |
Measurements: | nsamwrlosC1.b1:
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: | 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: | nsamwrlosC1.a1:
nsa5mwravgC1.c1:
nsaqmemwrcolC1.c1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/09/2005 | 2354 | 07/20/2005 | 0000 |
Subject: | NSA/MWR/C1 - Possible loss of accuracy due to missing blower |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | On 7/09 the MWR blower failed. The blower prevents snow and liquid drop from accumulating on the window. Accumulation of snow or liquid results in a loss of accuracy of the instrument. The loss of accuracy has consequencies on the retrieved liquid water path and precipitable water vapor. Usually there will be an overestimation of liquid and vapor. The blower was repaired and reinstalled on 7/20. Between 7/9 and 7/20 the tkair variable is unavailable as well. |
Measurements: | nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/05/2005 | 1952 | 09/01/2005 | 1945 |
Subject: | NSA/MWR/C1 - Missing Data |
DataStreams: | nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1, nsa5mwravgC1.c1 |
Description: | Instrument was removed for repair. |
Measurements: | nsa5mwravgC1.c1:
nsamwrC1.00:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/13/2005 | 0000 | 10/18/2005 | 2000 |
Subject: | NSA/MWR/C1 - Instrument problem, Heater problem |
DataStreams: | nsamwrC1.00, nsamwrlosC1.b1 |
Description: | The heater of the MWR was ON all the time even when the moisture sensor was dry. Jim Liljegren suspected a problem with the relay that activates the heater. The suggested action was to send the faulty assembly to SGP for repair and get a spare unit from SGP. The spare unit was sent on 9/15 and was installed on 10/18. |
Measurements: | nsamwrC1.00:
nsamwrlosC1.b1:
|
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 |
---|---|---|---|
09/01/2005 | 1945 | 09/06/2005 | 1500 |
Subject: | NSA/MWR/C1 - Reprocess: wrong calibration |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | When MWR#20 was returned to service on 9/1/2005, the calibration had changed as a result of the repairs made by Radiometrics and the RF deck temperature had been set to 325K for testing. On 9/2, the temperature was decreased to 307K to prevent thermal instability in winter and the calibration was changed in the configuration file with the values supplied on the repair report. The data need to be reprocessed with the calibration coefficients that were automatically derived after these changes were put into affect. They are: tnd_nom23=185.621, tnd_nom31=158.801, tc23=-0.022, tc31=-0.039. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/27/2005 | 2200 | 09/30/2005 | 2000 |
Subject: | NSA/MWR/C1 - Incorrect time stamp |
DataStreams: | nsamwrC1.00, nsamwrlosC1.b1 |
Description: | On Sept 27 the motherboard of the MWR computer was replaced. Following the replacement, the date on the computer was not set to the correct time of day, therefore the date and time in the files were wrong. The time on the computer was reset on Sept. 30. Time stamps between Sept. 27 and Sept. 30 were later corrected based on gathered information, however they may have as much as 5 minutes of uncertainty. |
Measurements: | nsamwrC1.00:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/02/1998 | 0000 | 02/03/1999 | 1200 |
Subject: | NSA/MWR/C1 - software upgrade (version 3.28) |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The MWR operating program was upgraded to version 3.28 on 3 February 1999. This version includes a beam width correction 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.) 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. 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. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/14/2006 | 0000 | 07/28/2006 | 0000 |
Subject: | NSA/MWR/C1 - TKAIR sensor failure |
DataStreams: | nsamwrlosC1.b1 |
Description: | Between 7/14 and 7/28 the tkair variable is missing most of the time and sometimes has large negative spikes. On 7/28, the sensor was cleaned of corrosion and the readings came back to normal. |
Measurements: | nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/05/2006 | 1100 | 10/23/2006 | 1600 |
Subject: | NSA/MWR/C1 - Rain sensor always on |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The rain sensor was always on between 10/5 and 10/23 2006. The user should be aware that not all data flagged as rainy are actually rainy. The problem was caused by a shift in the sensitivity of the rain sensor and was corrected by changing the sensor threshold in the configuration file. |
Measurements: | nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/19/1998 | 0053 | 11/16/1998 | 1800 |
Subject: | NSA/MWR/C1 - Software Change |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The MWR operating software was changed on 16 November 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: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/09/1998 | 0500 | 06/09/1998 | 2345 |
Subject: | NSA/MWR/C1 - Spikes in PWV data |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The PWV data began exhibiting a pattern of large (~5 cm) spikes which exponetially degrade to normal values. The problem is due to a fault in the serial or fiber optic data communication. This pattern began intermittent occurrence on 4/9/98 but it dominates the data by 5/1/98. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/15/1998 | 1900 | 11/21/1998 | 1825 |
Subject: | NSA/MWR/C1 - Spikes in PWV data |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | After reinstallation of repaired MWR #20, PWV data began exhibiting a pattern of large (~5 cm) spikes which exponetially degrade to normal values. The problem was due to a fault in the serial or fiber optic data communication. This pattern began intermittant ocurrance on 8/15/98 but it dominates the data by 9/6/98. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/09/1998 | 2345 | 07/07/1998 | 1800 |
Subject: | NSA/MWR/C1 - Reprocess: incorrect calibrations |
DataStreams: | nsamwrlosC1.00, nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | MWR #17 was placed in service while MWR #20 was being repaired by the manufacturer. The data need to be reprocessed with calibration coefficients appropriate for this instrument. |
Measurements: | nsamwrlosC1.00:
nsamwrlosC1.a1:
nsamwrlosC1.b1:
|