DQR ID | Subject | Data Streams Affected |
---|---|---|
D050310.1 | TWP/VCEIL/C2 - Ceilometer failure | twpvceil25kC2.00, twpvceil25kC2.b1 |
D051209.5 | TWP/VCEIL/C2 - occasional communication fault | twpvceil25kC2.b1 |
D060517.3 | TWP/VCEIL/C2 - Vceil computer disconnected | twpvceil25kC2.b1 |
D060717.5 | TWP/VCEIL/C2 - Time offset | twpvceil25kC2.b1 |
D070201.2 | TWP/VCEIL/C2 - optical cross-talk compensation | twpvceil25kC2.b1 |
D070329.1 | TWP/VCEIL/C2 - Receiver failure | twpvceil25kC2.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/26/2005 | 0600 | 04/01/2005 | 0007 |
Subject: | TWP/VCEIL/C2 - Ceilometer failure |
DataStreams: | twpvceil25kC2.00, twpvceil25kC2.b1 |
Description: | Large data gaps began occurring frequently at the TWP Nauru site 26 February at 06Z. Prior to 25 February, optical cross talk errors had been observed. Beginning on 25 February, data errors were observed. By 26 February, these errors were exhibiting themselves as extended data gaps. These gaps became increasingly frequent between 2/26 and 3/4. All data are missing after 20050304.1550. The instrument was replaced on 29 March and after some subsequent configuration work, the instrument was revived just after 00Z on 1 April. |
Measurements: | twpvceil25kC2.00:
twpvceil25kC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/30/2005 | 2000 | 12/12/2005 | 0346 |
Subject: | TWP/VCEIL/C2 - occasional communication fault |
DataStreams: | twpvceil25kC2.b1 |
Description: | Beginning August 30, 2005, the Nauru Ceilometer periodically went into a strange operational mode where the backscatter data exhibits vertical stripes. Looking at the backscatter data - there are high amplitude oscillations occuring in the backscatter as a function of time at a given height. The phenomenon appears to be more common at night. Dates include: 30 Aug, 31 Aug, 1 Sep, 9 Sep, 15 Sep, 20 Oct, 22 Oct, 8 Dec, and others. The fiber optic link to the ceilometer was faulty and causing periodic data corruption. The problem was corrected when the fiber optic line was replaced with a hard wired RS232 link. |
Measurements: | twpvceil25kC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/13/2006 | 2249 | 05/15/2006 | 0410 |
Subject: | TWP/VCEIL/C2 - Vceil computer disconnected |
DataStreams: | twpvceil25kC2.b1 |
Description: | VCEIL computer was disconnected during this time period. |
Measurements: | twpvceil25kC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/13/2006 | 2224 | 07/17/2006 | 1912 |
Subject: | TWP/VCEIL/C2 - Time offset |
DataStreams: | twpvceil25kC2.b1 |
Description: | On 7/14/2006, I found that the ceilometer time was 8m 36s slow, the PC time display (lower right taskbar) was frozen at "22:24", and AboutTime was not running. Corrected it on 7/17 by running AboutTime so that 19:03:29 became 19:12:05. This also corrected the frozen display on the Windows98 taskbar. I am not sure of the start time of this problem but there were several other Windows related issues that had to be corrected on 5/14 with indications of inappropriate access via Remote Administrator on 5/13. I do not know if the time offset was a sudden or gradual change. |
Measurements: | twpvceil25kC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/13/2006 | 0000 | 02/05/2007 | 0028 |
Subject: | TWP/VCEIL/C2 - optical cross-talk compensation |
DataStreams: | twpvceil25kC2.b1 |
Description: | The ceilometer gave frequent optical cross-talk compensation warnings, was insensitive to high clouds, and the tropics window was deteriorated. The instrument was replaced with a spare. |
Measurements: | twpvceil25kC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/11/2007 | 2120 | 04/17/2007 | 2325 |
Subject: | TWP/VCEIL/C2 - Receiver failure |
DataStreams: | twpvceil25kC2.b1 |
Description: | The receiver failed and the instrument was replaced. Data during the specified period are not valid. |
Measurements: | twpvceil25kC2.b1:
|