DQR ID | Subject | Data Streams Affected |
---|---|---|
D021212.11 | TWP/VCEIL/C3 - Degraded Sensitivity, Limited Range | twpvceil25kC3.a1, twpvceil25kC3.b1 |
D040506.1 | TWP/VCEIL/C3 - Data collection problem | twpvceil25kC3.00, twpvceil25kC3.b1 |
D051209.4 | TWP/VCEIL/C3 - Degraded hardware | twpvceil25kC3.b1 |
D051216.6 | TWP/VCEIL/C3 - ceilometer lost sensitivity | twpvceil25kC3.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/06/2002 | 0000 | 12/09/2002 | 0000 |
Subject: | TWP/VCEIL/C3 - Degraded Sensitivity, Limited Range |
DataStreams: | twpvceil25kC3.a1, twpvceil25kC3.b1 |
Description: | The Darwin ceilometer was displaying a cross-talk warning during this period. This causes degraded sensitivity and the inability of the ceilometer to identify cloud heights that are higher the about 2 km. |
Measurements: | twpvceil25kC3.a1:
twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/01/2004 | 0000 | 05/07/2004 | 0000 |
Subject: | TWP/VCEIL/C3 - Data collection problem |
DataStreams: | twpvceil25kC3.00, twpvceil25kC3.b1 |
Description: | There was a bad connection between the ceilometer and the instrument computer which resulted in a small amount of data loss on 8 days during the effected period. The data that were collected are not effected by the problem. On April 11, 34% of the data was lost and on April 1, 4% was lost. On the remaining 6 days, May 1-6, the amount of data lost was less than 2%/day. |
Measurements: | twpvceil25kC3.00:
twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/16/2005 | 0000 | 12/12/2005 | 0505 |
Subject: | TWP/VCEIL/C3 - Degraded hardware |
DataStreams: | twpvceil25kC3.b1 |
Description: | It appears that the sensitivity of the Darwin ceilometer was degrading over a few month period leading up to September 2005. Beginning on September 16, 2005, the instrument shifted to a particularly bad state. Looking at the backscatter data, I do not see nearly as great a day-night difference in the background as I expect and there is very little sensitivity to clouds. There was cross talk error noted with that instrument. The ceilometer was replaced on December 12. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/16/2005 | 2300 | 12/12/2005 | 0500 |
Subject: | TWP/VCEIL/C3 - ceilometer lost sensitivity |
DataStreams: | twpvceil25kC3.b1 |
Description: | ceilometer sesitivity decreased suddenly and only very strong cloud reflections are observed in the first kilometer. |
Measurements: | twpvceil25kC3.b1:
|