DQR ID | Subject | Data Streams Affected |
---|---|---|
D000504.4 | TWP/VCEIL/C1 - Ceilometer offset | twpvceil25kC1.b1 |
D000602.2 | TWP/VCEIL/C1 - Ceilometer clock drift | twpvceil25kC1.00, twpvceil25kC1.a1, twpvceil25kC1.b1 |
D000718.7 | TWP/VCEIL/C1 - Extended data gap | twpvceil25kC1.a1, twpvceil25kC1.b1 |
D000718.8 | TWP/VCEIL/C1 - Extended data gap | twpvceil25kC1.a1, twpvceil25kC1.b1 |
D000718.9 | TWP/VCEIL/C1 - Extended data gap | twpvceil25kC1.a1, twpvceil25kC1.b1 |
D000927.2 | TWP/VCEIL/C1 - Degraded Ceilometer Window | twpvceil25kC1.a1, twpvceil25kC1.b1 |
D010222.1 | TWP/VCEIL/C1 - Receiver Problem | twpvceil25kC1.a1, twpvceil25kC1.b1 |
D020207.1 | TWP/VCEIL/C1 - Manus Ceilometer Laser Power Intermittent | twpvceil25kC1.a1, twpvceil25kC1.b1 |
D020207.2 | TWP/VCEIL/C1 - Reprocess: Incorrect units on installed ceilometer | twpvceil25kC1.a1, twpvceil25kC1.b1 |
D020613.11 | TWP/VCEIL/C2 - Installation | twpvceil25kC2.00, twpvceil25kC2.a1, twpvceil25kC2.b1 |
D020620.64 | TWP/C1 - Incorrect elevation reported in Manus Data | twpmplC1.a1, twpvceil25kC1.a1, twpvceil25kC1.b1 |
D021025.2 | TWP/VCEIL/C2 - Nauru Vceil data suspect | twpvceil25kC2.a1, twpvceil25kC2.b1 |
D030527.8 | TWP/VCEIL/C2 - Power outage in I-Van resulted in Missing Data | twpvceil25kC2.00, twpvceil25kC2.a1, twpvceil25kC2.b1 |
D041013.2 | TWP/VCEIL/C1 - Data dropouts | twpvceil25kC1.00, twpvceil25kC1.b1 |
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 |
D090527.1 | TWP/VCEIL/C1 - Compensation fiber | twpvceil25kC1.b1 |
D990910.1 | Calibration interruption at TWP Nauru | twpvceil25kC2.00, twpvceil25kC2.a1, twpvceil25kC2.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/28/2000 | 0200 | 03/28/2000 | 0000 |
Subject: | TWP/VCEIL/C1 - Ceilometer offset |
DataStreams: | twpvceil25kC1.b1 |
Description: | When the replacement ceilometer was installed at Manus it was tilted 6 degrees. Since the angle correction setting was not activated, the cloud base heights reported by the instrument were higher than actual by 0.55% (39 m at 7 km). |
Measurements: | twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/19/1998 | 0000 | 08/22/1998 | 0000 |
Subject: | TWP/VCEIL/C1 - Ceilometer clock drift |
DataStreams: | twpvceil25kC1.00, twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | During this period the ceilometer was using a software version that provided time stamps that were based on the ceilometer clock and not the computer clock that was continually sychronized with GPS. This lead to times that were erroneous by as much as 2 minutes. For most applications 2 minutes is an acceptable error, but for some applications this may be a problem. |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
twpvceil25kC1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/11/1996 | 0000 | 02/17/1997 | 0000 |
Subject: | TWP/VCEIL/C1 - Extended data gap |
DataStreams: | twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | There is no ceilometer data for this period. |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/05/1997 | 1558 | 04/06/1997 | 0000 |
Subject: | TWP/VCEIL/C1 - Extended data gap |
DataStreams: | twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | There is no ceilometer data for this period. |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/02/1998 | 2058 | 04/19/1998 | 0700 |
Subject: | TWP/VCEIL/C1 - Extended data gap |
DataStreams: | twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | There is no ceilometer data for this period. |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/28/1999 | 0000 | 01/28/2000 | 0000 |
Subject: | TWP/VCEIL/C1 - Degraded Ceilometer Window |
DataStreams: | twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | Data from the ceilometer during this period is suspect. From 10/28 until about 2/4 the instrument had a deteriorated window. This caused the ceilometer to only be able to see cloud heights up to about 2 km. |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/12/2000 | 0000 | 02/09/2001 | 0000 |
Subject: | TWP/VCEIL/C1 - Receiver Problem |
DataStreams: | twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | The Manus ceilometer had degraded cloud base height due to a receiver problem |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/22/2001 | 0000 | 01/18/2002 | 0500 |
Subject: | TWP/VCEIL/C1 - Manus Ceilometer Laser Power Intermittent |
DataStreams: | twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | Very few cloud heights reported due to bad laser transmitter. Replaced ceilometer 05:00 GMT 18 Jan. 2002. |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/18/2002 | 0500 | 02/08/2002 | 0400 |
Subject: | TWP/VCEIL/C1 - Reprocess: Incorrect units on installed ceilometer |
DataStreams: | twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | The units setting on the ceilometer installed on 18 Jan. 2002 were incorrectly set to feet rather than meters. |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/28/1998 | 0455 | 11/19/1998 | 2359 |
Subject: | TWP/VCEIL/C2 - Installation |
DataStreams: | twpvceil25kC2.00, twpvceil25kC2.a1, twpvceil25kC2.b1 |
Description: | The Nauru ARCS was installed during the period September-November 1998. Data were being collected by the end of October, but for the first several weeks of November, the site was undergoing considerable change, so data from that period should be used with caution. The official site dedication occured on November 20. Most on-site activity ended following the dedication so we will consider November 20 to be the beginning of the Nauru operations. The last members of the installation team left Nauru on November 24. |
Measurements: | twpvceil25kC2.b1:
twpvceil25kC2.00:
twpvceil25kC2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0801 | 06/22/2000 | 2359 |
Subject: | TWP/C1 - Incorrect elevation reported in Manus Data |
DataStreams: | twpmplC1.a1, twpvceil25kC1.a1, twpvceil25kC1.b1 |
Description: | Bill Clements reports we have been using 6m MSL as the station elevation of Momote (Manus). This was based on information posted near the station barometer in the Momote Weather Service Office. It turns out that the official WMO station elevation for Momote is 4m MSL and the upper air elevation is 5m MSL. All Manus instruments except the sonde station are at 4m MSL. The sonde launching station is at 5m MSL. |
Measurements: | twpvceil25kC1.a1:
twpvceil25kC1.b1:
twpmplC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/05/2002 | 0100 | 09/23/2002 | 0100 |
Subject: | TWP/VCEIL/C2 - Nauru Vceil data suspect |
DataStreams: | twpvceil25kC2.a1, twpvceil25kC2.b1 |
Description: | During this period the ceilometer began producing a cross-talk warning. Since it is a warning, some of the data are OK. However, the instrument began to be limited to detecting clouds only about 2 km above the ground. |
Measurements: | twpvceil25kC2.b1:
twpvceil25kC2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/24/2003 | 2300 | 05/25/2003 | 0010 |
Subject: | TWP/VCEIL/C2 - Power outage in I-Van resulted in Missing Data |
DataStreams: | twpvceil25kC2.00, twpvceil25kC2.a1, twpvceil25kC2.b1 |
Description: | I forgot to put in the daily report that we took the I van down yesterday to replace the fans in the Clary UPS. This was from 2300z on 24May03 to 0010z on 25May03. Instruments affected : MPL Ceilometer MWR WSI TSI Rex |
Measurements: | twpvceil25kC2.b1:
twpvceil25kC2.00:
twpvceil25kC2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/29/2004 | 0100 | 11/15/2004 | 1520 |
Subject: | TWP/VCEIL/C1 - Data dropouts |
DataStreams: | twpvceil25kC1.00, twpvceil25kC1.b1 |
Description: | The Manus ceilometer was not receiving complete data packs from the ceilometer. This occurred at irregular intervals up to 3-10 times per hour until an error occurred and the computer locked up. The data were not affected when they were successfully collected. Days on which the data are missing for more than 1 hour are listed below. Some maintenance was done on the ceilometer data computer in November and the computer was ultimately replace on 3 January 2005. year.month.day 2004.09.29 2004.10.03 2004.10.04 2004.10.07 2004.10.10 2004.10.11 2004.10.12 2004.10.13 2004.10.14 2004.10.17 2004.10.18 2004.10.22 2004.10.25 2004.10.26 2004.10.27 2004.10.28 2004.10.29 2004.10.30 2004.11.15 |
Measurements: | twpvceil25kC1.b1:
twpvceil25kC1.00:
|
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.b1:
twpvceil25kC2.00:
|
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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/25/2009 | 1540 | 06/29/2009 | 0000 |
Subject: | TWP/VCEIL/C1 - Compensation fiber |
DataStreams: | twpvceil25kC1.b1 |
Description: | The VCEIL was reporting a "receiver optical cross-talk compensation is poor" warning. The window was cleaned and the instrument was power-cycled. The problem was corrected when the compensation fiber was replaced and ants were removed from communication connector. Cloud detection was impaired. |
Measurements: | twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/10/1999 | 0425 | 08/10/1999 | 0450 |
Subject: | Calibration interruption at TWP Nauru |
DataStreams: | twpvceil25kC2.00, twpvceil25kC2.a1, twpvceil25kC2.b1 |
Description: | The ceilometer was tipped horizontal for a calibration check |
Measurements: | twpvceil25kC2.b1:
twpvceil25kC2.00:
twpvceil25kC2.a1:
|