| DQR ID | Subject | Data Streams Affected | Data Quality Metric |
|---|---|---|---|
| D020606.1 | NSA/MMCR/C1 - NSA/C1/MMCR- Incorrect Calibrations | nsaarscl1clothC1.c1 | Incorrect |
| D020823.37 | NSA/MMCR/C1 - Pulse controller failed due to water damage | nsaarscl1clothC1.c1 | Incorrect |
| D020823.38 | NSA/MMCR/C1 - No radar pulse transmission | nsaarscl1clothC1.c1 | Incorrect |
| D020823.39 | NSA/MMCR/C1 - MUX failure | nsaarscl1clothC1.c1 | Incorrect |
| D090728.2 | NSA/ARSCL/C1 - Reflectivity values unreliable | nsaarscl1clothC1.c1 | Suspect |
| D110803.1 | NSA/ARSCL/C1 - Reflectivity too high | nsaarscl1clothC1.c1 | Incorrect |
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 07/03/2001 | 0000 | 07/26/2001 | 2359 | Incorrect |
| Subject: | NSA/MMCR/C1 - NSA/C1/MMCR- Incorrect Calibrations |
| DataStreams: | nsaarscl1clothC1.c1 |
| Description: | From 3-July 2001 to 26-July 2001, the NSA MMCR calibration for the two coded pulse modes is incorrect. The values of reflectivity computed by the radars autocalibration software are wrong because they use the wrong radar constant. The correct radar constants are: 8-bit coded mode RC=16.344 and for the 32-bit coded RC=7.313. The only impact of the incorrect radar constants should be reflectivity value |
| Measurements: | nsaarscl1clothC1.c1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 06/04/1999 | 0430 | 07/21/1999 | 2300 | Incorrect |
| Subject: | NSA/MMCR/C1 - Pulse controller failed due to water damage |
| DataStreams: | nsaarscl1clothC1.c1 |
| Description: | Instrument had water damage that fried the pulse controller card. Images appear normal, but no clouds were detected during this period because no radar pulse was being emitted. Note from Karen Johnson: the ARSCL and MMCRMODE data fields may or may not be suspect, depending on whether ARSCL correctly identified the MMCR data as bad. |
| Measurements: | nsaarscl1clothC1.c1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 02/28/1999 | 0830 | 02/28/1999 | 0900 | Incorrect |
| 12/14/1998 | 1430 | 12/14/1998 | 1445 | Incorrect |
| 01/15/1999 | 0300 | 01/15/1999 | 0320 | Incorrect |
| Subject: | NSA/MMCR/C1 - No radar pulse transmission |
| DataStreams: | nsaarscl1clothC1.c1 |
| Description: | A fault in transmission occurred so no radar pulse was emitted and therefore no return signal, only noise, was received. Note from Karen Johnson: the ARSCL and MMCRMODE data fields may or may not be suspect, depending on whether ARSCL correctly identified the MMCR data as bad. |
| Measurements: | nsaarscl1clothC1.c1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 03/17/1999 | 0900 | 03/18/1999 | 2359 | Incorrect |
| Subject: | NSA/MMCR/C1 - MUX failure |
| DataStreams: | nsaarscl1clothC1.c1 |
| Description: | Data values dropped to background clear sky (noise level). Other cloud instruments indicated it was cloudy. The MUX card was replaced and good data started flowing again at 00 GMT on 3/19. Note from Karen Johnson: the ARSCL and MMCRMODE data fields may or may not be suspect, depending on whether ARSCL correctly identified the MMCR data as bad. |
| Measurements: | nsaarscl1clothC1.c1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/01/2007 | 0000 | 02/13/2008 | 2359 | Suspect |
| Subject: | NSA/ARSCL/C1 - Reflectivity values unreliable |
| DataStreams: | nsaarscl1clothC1.c1 |
| Description: | Reflectivity dBZ values should not be used. The reported cloud boundaries may underestimate cloud tops, particularly for high or thick clouds. Also thin high clouds may have been missed entirely, especially if there were lower-level cloud layers below them. During this time period, the MMCR was transmitting in circular polarization, rather than (correct) linear polarization. This caused reported Reflectivity values to be too low by an unknown amount, resulting in an effective loss of radar sensitivity. Areas identified as have having hydrometeor detections are correct, however some areas marked as clear may in fact contain cloud due to the MMCR's low sensitivity during this time. |
| Measurements: | nsaarscl1clothC1.c1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 02/10/2010 | 0000 | 02/23/2010 | 0230 | Incorrect |
| 01/10/2010 | 0000 | 01/18/2010 | 1830 | Incorrect |
| Subject: | NSA/ARSCL/C1 - Reflectivity too high |
| DataStreams: | nsaarscl1clothC1.c1 |
| Description: | The calibration of the MMCR was incorrect during this period, causing large positive shifts in reported reflectivity values. As a result, the reflectivies reported by ARSCL are also too high. However, other radar moments (MeanDopplerVelocity and SpectralWidth) and cloud boundaries reported in ARSCL data files are not affected and can be used. Do not use ReflectivityBestEstimate, Reflectivity, or ReflectivityNoClutter values during this period. |
| Measurements: | nsaarscl1clothC1.c1:
|