| DQR ID | Subject | Affected Data Streams | Data Quality Metric |
|---|---|---|---|
| D101025.1 | NSA/MWR/C1 - Missing data | nsamwrtipC1.a1 | Missing |
| D050203.1 | NSA/MWR/C1 - poor air temperature values | nsamwrtipC1.a1 | Incorrect |
| D051020.1 | NSA/MWR/C1 - Incorrect time stamp | nsamwrlosC1.b1 | Suspect |
| D050112.1 | NSA/C1 - Site-wide power failure | nsametC1.b1 | Missing |
| D050920.2 | NSA/MWR/C1 - Instrument problem, Heater problem | nsamwrlosC1.b1 | Note |
| D100215.3 | NSA/CEIL/C1/C2 - Reprocess: Incorrect serial_number and sum_backscatter fields | nsaceilC2.b1 | Incorrect |
| D050725.7 | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients | nsamwrlosC1.a1 | Note |
| D050321.4 | NSA/SONDE/C1 - Bad temperature | nsasondewnpnC1.b1 | Suspect |
| D041130.1 | NSA/SONDE/C1 - Test sounding using RS80H | nsasondewnpnC1.b1 | Suspect |
| D050930.1 | NSA/MWR/C1 - Reprocessed and Corrected:wrong calibration | nsamwrlosC1.b1 | Note |
| D050624.6 | NSA/CEIL/C1 - Reprocess: Intermittent data and clock drift | nsaceilC1.b1 | Suspect |
| D050928.3 | NSA/MWR/C1 - New software version (4.15) installed | nsamwrtipC1.a1 | Note |
| D030515.3 | NSA/MWR/C1 - no air temperature signal | nsamwrlosC1.b1 | Missing |
| D050809.2 | NSA/MWR/C1 - Possible loss of accuracy due to missing blower | nsamwrlosC1.b1 | Suspect |
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1998-11-11 | 18:31:00 | 1998-11-18 | 19:29:00 | Missing |
| 2010-09-27 | 02:54:00 | 2010-10-01 | 19:24:00 | Missing |
| 1998-07-18 | 19:04:00 | 1998-07-27 | 21:33:00 | Missing |
| 2002-05-08 | 21:44:00 | 2002-05-23 | 19:25:00 | Missing |
| 2002-08-19 | 16:56:00 | 2002-08-21 | 19:25:00 | Missing |
| 2014-10-01 | 00:00:00 | 2014-10-02 | 19:06:59 | Missing |
| 1998-07-29 | 08:28:00 | 1998-08-03 | 19:01:00 | Missing |
| 1998-08-05 | 00:28:00 | 1998-09-24 | 20:42:00 | Missing |
| 2011-05-22 | 17:00:00 | 2011-05-24 | 00:00:00 | Missing |
| 1998-03-06 | 18:46:00 | 1998-03-14 | 02:00:00 | Missing |
| 2006-02-25 | 08:11:00 | 2006-02-27 | 18:27:00 | Missing |
| 2003-06-29 | 16:30:00 | 2003-07-01 | 22:33:00 | Missing |
| 2004-07-10 | 22:55:00 | 2004-07-12 | 19:18:00 | Missing |
| 2002-12-05 | 22:53:00 | 2002-12-08 | 21:20:00 | Missing |
| 2004-02-10 | 08:45:00 | 2004-02-17 | 01:56:00 | Missing |
| 2001-08-15 | 00:00:00 | 2001-08-20 | 00:00:00 | Missing |
| 1998-04-24 | 18:38:00 | 1998-04-29 | 23:40:00 | Missing |
| 2002-02-14 | 21:59:00 | 2002-02-25 | 20:09:00 | Missing |
| 2001-03-28 | 23:59:00 | 2001-04-01 | 00:01:00 | Missing |
| 1999-11-17 | 00:43:00 | 1999-11-19 | 00:33:00 | Missing |
| 1999-01-02 | 09:47:00 | 1999-01-04 | 17:56:00 | Missing |
| 2001-12-30 | 23:59:00 | 2002-01-01 | 00:00:00 | Missing |
| 1998-05-30 | 18:40:00 | 1998-06-01 | 18:58:00 | Missing |
| 2005-08-05 | 19:52:00 | 2005-09-01 | 19:45:00 | Missing |
| 1998-02-13 | 13:59:00 | 1998-02-22 | 20:22:00 | Missing |
| 1998-07-13 | 01:03:00 | 1998-07-16 | 18:16:00 | Missing |
| 2009-09-17 | 22:41:00 | 2009-09-20 | 17:34:00 | Missing |
| 1998-03-15 | 23:22:00 | 1998-03-19 | 00:53:00 | Missing |
| 1998-05-03 | 12:03:00 | 1998-05-11 | 21:37:00 | Missing |
| 1999-10-11 | 23:59:00 | 1999-10-13 | 22:00:00 | Missing |
| 2002-02-27 | 07:00:00 | 2002-03-02 | 01:00:00 | Missing |
| 2003-08-09 | 04:59:00 | 2003-08-11 | 18:07:00 | Missing |
| 1998-06-09 | 23:38:00 | 1998-06-16 | 22:43:00 | Missing |
| 1998-09-24 | 22:10:00 | 1998-11-11 | 18:30:00 | Missing |
| 2000-12-22 | 23:00:00 | 2001-01-09 | 22:33:00 | Missing |
| 1998-02-08 | 14:59:00 | 1998-02-11 | 22:54:00 | Missing |
| 2011-04-27 | 18:00:00 | 2011-05-03 | 19:00:00 | Missing |
| 2001-08-09 | 00:00:00 | 2001-08-13 | 00:00:00 | Missing |
| 2005-09-22 | 05:45:00 | 2005-09-27 | 23:57:00 | Missing |
| 2002-04-25 | 18:55:00 | 2002-05-08 | 21:38:00 | Missing |
| 2000-01-28 | 19:29:00 | 2000-01-31 | 17:54:00 | Missing |
| Subject: | NSA/MWR/C1 - Missing data |
|---|---|
| Affected Datastreams: | nsamwrtipC1.a1 |
| Description | Data are missing and unrecoverable. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2005-01-15 | 00:54:00 | 2005-01-19 | 11:43:00 | Incorrect |
| Subject: | NSA/MWR/C1 - poor air temperature values |
|---|---|
| Affected Datastreams: | 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2005-09-27 | 22:00:00 | 2005-09-30 | 20:00:00 | Suspect |
| Subject: | NSA/MWR/C1 - Incorrect time stamp |
|---|---|
| Affected Datastreams: | 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2004-12-13 | 10:00:00 | 2004-12-13 | 23:30:00 | Missing |
| Subject: | NSA/C1 - Site-wide power failure |
|---|---|
| Affected Datastreams: | nsametC1.b1 |
| 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2005-09-13 | 00:00:00 | 2005-10-18 | 20:00:00 | Note |
| Subject: | NSA/MWR/C1 - Instrument problem, Heater problem |
|---|---|
| Affected Datastreams: | 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 1999-08-22 | 00:00:00 | 2009-10-31 | 23:59:00 | Incorrect |
| Subject: | NSA/CEIL/C1/C2 - Reprocess: Incorrect serial_number and sum_backscatter fields |
|---|---|
| Affected Datastreams: | nsaceilC2.b1 |
| Description | Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 and b1 level data collected prior to the begin date. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-04-25 | 19:00:00 | 2005-06-29 | 00:00:00 | Note |
| Subject: | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients |
|---|---|
| Affected Datastreams: | nsamwrlosC1.a1 |
| 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2005-03-08 | 23:00:00 | 2005-03-09 | 00:33:00 | Suspect |
| Subject: | NSA/SONDE/C1 - Bad temperature |
|---|---|
| Affected 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2004-11-29 | 23:03:00 | 2004-11-30 | 00:23:00 | Suspect |
| Subject: | NSA/SONDE/C1 - Test sounding using RS80H |
|---|---|
| Affected Datastreams: | nsasondewnpnC1.b1 |
| Description | This is a test sounding done using an old RS80H radiosonde rather than the production RS90 version. Although the sonde functioned normally, the RH data may be subject to a dry bias caused by the age of the sensor and possible contamination. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2005-09-01 | 19:45:00 | 2005-09-06 | 15:00:00 | Note |
| Subject: | NSA/MWR/C1 - Reprocessed and Corrected:wrong calibration |
|---|---|
| Affected Datastreams: | nsamwrlosC1.b1 |
| Description | DATA REPROCESSED and CORRECTED: 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. 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 calibration coefficients were derived automatically after the changes were put into affect. The data were reprocessed using the derived calibration coefficients. ORIGINAL DQR CATEGORY: Red( Incorrect) REPROCESSED and CORRECTED DATA ARCHIVED:2016-03-29 REPROCESS IDENTIFICATION NUMBER: RID 209 --------------------------------------------------- --- ORIGINAL DQR 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2005-06-16 | 00:00:00 | 2005-06-27 | 23:59:00 | Suspect |
| Subject: | NSA/CEIL/C1 - Reprocess: Intermittent data and clock drift |
|---|---|
| Affected Datastreams: | nsaceilC1.b1 |
| Description | The available processed data for the NSA.C1 VCEIL for the time period indicated are incomplete. The raw data is largely complete but pre-processing is required before these data can be reprocessed to produce a complete netcdf data set. While awaiting the reprocessed data set, the intermittent data are available from the ARM Archive. Users should be aware that the data are additionally compromised by a clock drift of at least 10 minutes, though this likely has little affect on cloud detection results. The clock drift will not be addressed by the reprocessing. Note also, that the clock drift was corrected at the end of the DQR period, but it may have existed before the beginning of the DQR period. The data for this period should be used with caution. |
| Measurements |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2002-09-16 | 18:20:00 | 2005-09-15 | 17:02:00 | Note |
| Subject: | NSA/MWR/C1 - New software version (4.15) installed |
|---|---|
| Affected Datastreams: | 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2003-05-13 | 19:06:00 | 2005-01-15 | 00:54:00 | Missing |
| Subject: | NSA/MWR/C1 - no air temperature signal |
|---|---|
| Affected Datastreams: | nsamwrlosC1.b1 |
| 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 |
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 2005-07-09 | 23:54:00 | 2005-07-20 | 00:00:00 | Suspect |
| Subject: | NSA/MWR/C1 - Possible loss of accuracy due to missing blower |
|---|---|
| Affected Datastreams: | nsamwrlosC1.b1 |
| 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 |
|