DQR ID | Subject | Data Streams Affected |
---|---|---|
D030515.3 | NSA/MWR/C1 - no air temperature signal | nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050203.1 | NSA/MWR/C1 - poor air temperature values | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050321.4 | NSA/SONDE/C1 - Bad temperature | nsasondewnpnC1.b1 |
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 |
D060928.4 | NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry | nsasondewnpnC1.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 |
---|---|---|---|
01/15/2005 | 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 |
---|---|---|---|
03/08/2005 | 2300 | 03/09/2005 | 0033 |
Subject: | NSA/SONDE/C1 - Bad temperature |
DataStreams: | nsasondewnpnC1.b1 |
Description: | Because of strong winds, the radiosonde hit the ground after launch and the temperature sensor broke. The RH and pressure data also should be considered suspect. |
Measurements: | nsasondewnpnC1.b1:
|
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 |
---|---|---|---|
09/29/2006 | 0500 | 12/31/9999 | 2359 |
Subject: | NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry |
DataStreams: | nsasondewnpnC1.b1 |
Description: | The output precision of the following variables was increased 20060929: alt changed from 1m to 0.1m dp changed from 0.1degC to 0.01degC pres changed from 0.1 hPa to 0.01 hPa RH changed from 1%RH to 0.01%RH tdry changed from .1degC to 0.01degC Note that the increase in precision does not necessarily imply an increase in accuracy. Users are cautioned to continue to use their best scientific judgement when using these or any other data. |
Measurements: | nsasondewnpnC1.b1:
|