| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D091210.1 | NSA/VCEIL/C1 - Degraded window | nsavceil25kC1.b1 |
| D100125.2 | NSA/VCEIL/C1 - Missing data | nsavceil25kC1.b1 |
| D100616.2 | NSA/VCEIL/C1 - Small gaps in data | nsavceil25kC1.b1 |
| D100719.1 | NSA/VCEIL/C1 - Gaps in data | nsavceil25kC1.b1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/02/2006 | 0000 | 12/03/2009 | 2107 |
| Subject: | NSA/VCEIL/C1 - Degraded window |
| DataStreams: | nsavceil25kC1.b1 |
| Description: | The ceilometer continuously gave warnings for window contamination because the window had deteriorated. Cloud base height detection did not appear to be significantly affected. The window conditioner was replaced on 8/11/09 but this did not clear the warning. The instrument was replaced. |
| Measurements: | nsavceil25kC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/23/2010 | 0600 | 01/25/2010 | 2041 |
| Subject: | NSA/VCEIL/C1 - Missing data |
| DataStreams: | nsavceil25kC1.b1 |
| Description: | Data are missing and unrecoverable. |
| Measurements: | nsavceil25kC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/03/2009 | 2107 | 06/15/2010 | 2143 |
| Subject: | NSA/VCEIL/C1 - Small gaps in data |
| DataStreams: | nsavceil25kC1.b1 |
| Description: | When the ceilometer was replaced, small gaps in the netCDF files occurred due to the presence of '?' characters in the backscatter and header records of the raw data that could not be ingested. It is unknown whether this was caused by a poor CPU board or incompatibilities with the computer configuration (hyper-threading). The problem was corrected when the instrument and computer were both replaced. During this period, approximately 3% of data are missing each hour due to this problem. |
| Measurements: | nsavceil25kC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/15/2010 | 2159 | 06/17/2010 | 2201 |
| Subject: | NSA/VCEIL/C1 - Gaps in data |
| DataStreams: | nsavceil25kC1.b1 |
| Description: | When the CT25K ceilometer was replaced with a new CL31, checksum errors began occurring at regular 6-min intervals and several things were done to diagnose the problem, including changing the serial cable and trying different computer types. It was finally corrected by replacing the computer with one in which hyperthreading was disabled by default in the BIOS. |
| Measurements: | nsavceil25kC1.b1:
|