DQR ID | Subject | Data Streams Affected | Data Quality Metric |
---|---|---|---|
D030922.3 | NSA/MPL/C1 - laser head failure | nsamplcmask1clothC1.c1 | Missing |
D040124.1 | NSA/MPL/C1 - Laser Q-Switch Problem | nsamplcmask1clothC1.c1 | Incorrect |
D040426.3 | NSA/MPL/C1 - Hardware Failure/Missing Data | nsamplcmask1clothC1.c1 | Missing |
D050215.3 | NSA/MPL/C1 - Frost on Viewport Window | nsamplcmask1clothC1.c1 | Does not affect quality |
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
04/28/2002 | 0200 | 08/29/2002 | 0100 | Missing |
Subject: | NSA/MPL/C1 - laser head failure |
DataStreams: | nsamplcmask1clothC1.c1 |
Description: | On 2002-04-28 the laser energy was observed to decrease throughout the day. Although low clouds continued to be detected, by the end of the day the output laser energy was about 10% of nomimal. This decrease continued throughout 2002-04-29 to the extent that clouds were no longer detected. The source of failure was eventually determined to be the laser head, requiring the MPL to be shipped for repair. The MPL was reinstalled on 2002-08-28 at about 01:00 UTC. MPL NSA data from 2002-04-29 through 2002-08-27 (inclusive) should not be used. |
Measurements: | nsamplcmask1clothC1.c1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
01/19/2004 | 2252 | 01/24/2004 | 0016 | Incorrect |
Subject: | NSA/MPL/C1 - Laser Q-Switch Problem |
DataStreams: | nsamplcmask1clothC1.c1 |
Description: | At about 22:52 UTC on 2004/01/19, the NSA MPL appears to have suffered a temporary failure of the laser Q-Switch. This results in a complete loss of lidar data immediately thereafter. The problem was resolved (at least for the time being) by disconnecting and reconnecting the Q-Switch cable on 2004/01/24 at about 00:16 UTC. Data after this time appears good. |
Measurements: | nsamplcmask1clothC1.c1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
11/21/2003 | 0500 | 12/01/2003 | 1441 | Missing |
Subject: | NSA/MPL/C1 - Hardware Failure/Missing Data |
DataStreams: | nsamplcmask1clothC1.c1 |
Description: | Data are missing during this extended period due to a hardware failure. |
Measurements: | nsamplcmask1clothC1.c1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
12/07/1998 | 0000 | 08/31/2009 | 2357 | Does not affect quality |
Subject: | NSA/MPL/C1 - Frost on Viewport Window |
DataStreams: | nsamplcmask1clothC1.c1 |
Description: | During periods of extremely cold outside temperatures (-30 C or below), the MPL may suffer from reduced sensitivity due to obscuration of its viewport window with frost or condensation. During the winter of 1998-1999, on-site observers noted frost or condensation obscuring part or all of the viewport window. A fan providing blowing heated air on the viewport had failed. Although replacement of this fan reduced the degree of obscuration, the problem was not entirely eliminated. During the summer of 1999 a more robust forced-air system was installed and the problem was essentially solved except for during isolated cases of extremely cold weather. Under these extreme conditions partial or complete obscuration of the window is still possible with the result that cloud detection sensitivity will be reduced depending on the fraction of the window surface obscured. Even with significant obscuration, the MPL may still detect clouds and the cloud base heights of detected clouds will be reported correctly. This problem is one of detection sensitivity only and does not affect the range scale in any way. |
Measurements: | nsamplcmask1clothC1.c1:
|