| DQR ID | Subject | Data Streams Affected | Data Quality Metric |
|---|---|---|---|
| D040426.2 | NSA/MMCR/C1 - Transmitter (TWTA) failure | nsammcrmomC1.b1 | Incorrect |
| D050103.1 | NSA/MMCR/C1 - Coherent Up/Down Coverter Off | nsammcrmomC1.b1 | Incorrect |
| D050112.1 | NSA/C1 - Site-wide power failure | nsammcrmomC1.b1 | Missing |
| D050124.1 | NSA/MMCR/C1 - Instrument failure | nsammcrmomC1.b1 | Incorrect |
| D060130.1 | NSA/MMCR/C1 - instrument unstable | nsammcrmomC1.b1 | Incorrect |
| D060803.1 | NSA/MMCR/C1 - Sensitivity Loss, Calibration Wrong | nsammcrmomC1.b1 | Incorrect |
| D061211.1 | NSA/MMCR/C1 - MMCR TWTA Failure | nsammcrmomC1.b1 | Incorrect |
| D070705.1 | NSA/MMCR/C1 - Transmitter failure | nsammcrmomC1.b1 | Incorrect |
| D070716.4 | NSA/MMCR/C1 - Antenna Feed Corrosion | nsammcrmomC1.b1 | Incorrect |
| D071205.1 | NSA/MMCR/C1 - Antenna rotation | nsammcrmomC1.b1 | Does not affect quality |
| D071214.2 | NSA/MMCR/C1 - Reprocessing Notice (RID 464) | nsammcrmomC1.b1 | Does not affect quality |
| D080218.2 | NSA/MMCR/C1/C2 - Wrong Polarization | nsammcrmomC1.b1 | Incorrect |
| D080430.1 | NSA/MMCR/C1 - Reflectivities too high | nsammcrmomC1.b1 | Incorrect |
| D090817.2 | NSA/MMCR/C1 - CUDC failure | nsammcrmomC1.b1 | Incorrect |
| D100125.1 | NSA/MMCR/C1 - Reflectivity shift | nsammcrmomC1.b1 | Incorrect |
| D100224.1 | NSA/MMCR/C1 - Reflectivity bias | nsammcrmomC1.b1 | Incorrect |
| D100224.3 | NSA/MMCR/C1 - Reflectivity bias | nsammcrmomC1.b1 | Incorrect |
| D100402.1 | NSA/MMCR/C1 - Coherent Up/Down Converter failure | nsammcrmomC1.b1 | Incorrect |
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 04/23/2004 | 0000 | 04/23/2004 | 1900 | Incorrect |
| Subject: | NSA/MMCR/C1 - Transmitter (TWTA) failure |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The transmitter (TWTA) failed with a high helix current error. I was able to reset the TWTA and it has been working ok since then. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/29/2004 | 0200 | 01/03/2005 | 2250 | Incorrect |
| Subject: | NSA/MMCR/C1 - Coherent Up/Down Coverter Off |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The Coherent Up/Down Converter was inadvertently turned off during this period. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/13/2004 | 1000 | 12/13/2004 | 2330 | Missing |
| Subject: | NSA/C1 - Site-wide power failure |
| DataStreams: | nsammcrmomC1.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: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 01/23/2005 | 1530 | 03/30/2005 | 1837 | Incorrect |
| Subject: | NSA/MMCR/C1 - Instrument failure |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The Coherent Up/Down Converter failed. The report from the manufacturer is that the SSB mixer died. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 01/22/2006 | 0100 | 01/30/2006 | 1830 | Incorrect |
| Subject: | NSA/MMCR/C1 - instrument unstable |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The MMCR was in an unstable state that rendered the data useless during the period of this DQR. Rebooting the system restored it to normal operation. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 08/01/2005 | 0000 | 02/01/2007 | 2359 | Incorrect |
| Subject: | NSA/MMCR/C1 - Sensitivity Loss, Calibration Wrong |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | Jay Mace compared data from CLOUDSAT to the MMCR and found significant discrepancies. It appears that the MMCR has a sensitivity problem and is underreporting reflectivity by ~20 dBZ. A comparison with the MPL shows that this might be a gradual degradation, i.e. there are no apparent shifts identifying when this might have occured. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 11/05/2005 | 0100 | 02/01/2007 | 2359 | Incorrect |
| Subject: | NSA/MMCR/C1 - MMCR TWTA Failure |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The TWTA is no longer transmitting. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 06/29/2007 | 2200 | 07/11/2007 | 2150 | Incorrect |
| Subject: | NSA/MMCR/C1 - Transmitter failure |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The MMCR has had a hardware failure. The transmitter apparently isn't working. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 01/01/2006 | 0000 | 10/17/2007 | 0200 | Incorrect |
| Subject: | NSA/MMCR/C1 - Antenna Feed Corrosion |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | During a trip to Barrow, I inspected the feed under the antenna and noticed an extreme amount of corrosion that has resulted in the flexible waveguide connected to the feed to be pushed off at an angle with corrosion in between. I attempted to remove and clean but the corrosion has effectively welded the two pieces together. This didn't happen overnight and the start date is a guess. The last inspection of the antenna probably took place in April 2004 when we did the C40 DSP upgrade. I don't know how much the reflectivity is affected by this corrosion. It may be possible to get an idea once we replace the antenna by making some intercomparison measurements. The feed was temporarily repaired on 10/16/2007 until the new antenna was installed. The measured loss before and after the repair was 5.1 dB. This means that the MMCR was under-reporting reflectivity by 10.2 dB just before it was repaired. That said, there is no way of ascertaining what the rate of corrosion was and how the loss changed during the period of this DQR. One can assume that the 5.1 dB loss was the worst that it was. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/01/2007 | 0000 | 12/01/2007 | 2359 | Does not affect quality |
| Subject: | NSA/MMCR/C1 - Antenna rotation |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | A new antenna was installed and the orientation of the antenna feed caused a rotation of the polarization by 90 degrees. Since this is a zenith pointing radar, the polarization orientation is arbitrary and should have no appreciable effects. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/01/2007 | 0000 | 12/14/2007 | 2156 | Does not affect quality |
| Subject: | NSA/MMCR/C1 - Reprocessing Notice (RID 464) |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | See below for details of reprocessing that was completed on 20141217. Original DQR category: 4 (Red, Incorrect). ----------------------------------------------------------- The antenna gain used in the calibration table was for the old antenna (54.3 dBi). The new gain figure was received today and it is 52 dBi. The antenna designer stated that the gain has an unexpected and unexplained minimum at the design frequency (34.86 GHz.) |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/01/2007 | 0100 | 02/14/2008 | 0200 | Incorrect |
| Subject: | NSA/MMCR/C1/C2 - Wrong Polarization |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The new antenna was mistakingly set to transmit/receive in circular polarization instead of linear polarization. The result is that reflectivities are much lower than they should be. Since we only measure on polarization channel, there is no way to apply a correction to go from circular to linear polarization. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 02/13/2008 | 0215 | 03/23/2011 | 2359 | Incorrect |
| Subject: | NSA/MMCR/C1 - Reflectivities too high |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | Comparison with the Canadian NRC radar's aboard their Convair seem to indicate that the Barrow MMCR is reporting reflectivity approximately 10 dBZ higher than they should be. We are currently analyzing the radar's calibration and trying to figure out where this offset may be coming from. If using reflectivity values, 10 dBZ should be subtracted. I estimate that this should be accurate to within +/- 2 dBZ. Once we find the cause and can come up with an accurate offset, this DQR will be revised and a request to reprocess the data will be submitted. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 08/12/2009 | 1300 | 08/17/2009 | 1615 | Incorrect |
| Subject: | NSA/MMCR/C1 - CUDC failure |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The Coherent Up/Down Converter's +15 vdc power supply failed. During this time the MMCR was supplying erroneous data. Instrument was taken offline. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 01/10/2010 | 0000 | 01/18/2010 | 1830 | Incorrect |
| Subject: | NSA/MMCR/C1 - Reflectivity shift |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | A significantly high over-reporting of reflectivity occurred during this period. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 01/10/2010 | 0000 | 01/18/2010 | 1930 | Incorrect |
| Subject: | NSA/MMCR/C1 - Reflectivity bias |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The MMCR calibration was incorrect causing a very large positive shift in reflectivity values. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 02/10/2010 | 0000 | 02/23/2010 | 0230 | Incorrect |
| Subject: | NSA/MMCR/C1 - Reflectivity bias |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | The MMCR calibration was incorrect causing a very large positive shift in reflectivity values. |
| Measurements: | nsammcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/10/2009 | 1800 | 12/22/2009 | 1700 | Incorrect |
| Subject: | NSA/MMCR/C1 - Coherent Up/Down Converter failure |
| DataStreams: | nsammcrmomC1.b1 |
| Description: | Coherent Up/Down Converter failure. Replacement was installed on 12/22/2009 at 1700. |
| Measurements: | nsammcrmomC1.b1:
|