DQR ID | Subject | Data Streams Affected |
---|---|---|
D070112.3 | TWP/MMCR/C3 - Reprocess: Height Error | twpmmcrmomC3.00, twpmmcrmomC3.b1, twpmmcrspecmomC3.a0 |
D070201.1 | TWP/VCEIL/C3 - Reduced sensitivity to high clouds | twpvceil25kC3.b1 |
D070407.1 | TWP/MPL/C3 - False cloud detection at 15-20km | twpmplpolC3.b1, twpmplpolavgC3.c1, twpmplpolavgC3.s1, twpmplsmask1clothC3.c1 |
D081022.8 | TWP/SMET/C3 - Wind Speed data contain offset due to induced voltage | twpsmet60sC3.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/04/2005 | 0500 | 01/10/2007 | 2000 |
Subject: | TWP/MMCR/C3 - Reprocess: Height Error |
DataStreams: | twpmmcrmomC3.00, twpmmcrmomC3.b1, twpmmcrspecmomC3.a0 |
Description: | A timing error was found in the PIRAQ MMCR's. It resulted in recorded heights being too high for each radar mode by the following amounts: Mode 1: 24.8756 m too high Mode 2: 25.6249 m too high Mode 3: 33.1176 m too high Mode 4: 33.1176 m too high Range gate spacing was not affected. |
Measurements: | twpmmcrspecmomC3.a0:
twpmmcrmomC3.00:
twpmmcrmomC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/20/2006 | 0401 | 01/12/2007 | 0120 |
Subject: | TWP/VCEIL/C3 - Reduced sensitivity to high clouds |
DataStreams: | twpvceil25kC3.b1 |
Description: | The instrument produced a significant number of optical cross-talk warnings and displayed a reduced capacity to detect high clouds. The internal cables were inspected, the compensation fiber and optics monitor were replaced, the crosstalk compensation was adjusted, and the system tested with an optical termination hood, all with no improvement. While waiting for a new receiver board, receiver ribbon cable, and compensation fiber cable from Vaisala, a spare ceilometer with a standard, "non-tropics", window was installed. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/01/2006 | 0000 | 05/15/2007 | 0100 |
Subject: | TWP/MPL/C3 - False cloud detection at 15-20km |
DataStreams: | twpmplpolC3.b1, twpmplpolavgC3.c1, twpmplpolavgC3.s1, twpmplsmask1clothC3.c1 |
Description: | During the period specified, clouds were sometimes incorrectly detected at 15-20km. These artifacts were seen as quasi-stationary layers that were clearly not atmospheric in origin. A replacement instrument was installed in May 2007 to correct the problem. |
Measurements: | twpmplpolavgC3.c1:
twpmplpolC3.b1:
twpmplsmask1clothC3.c1:
twpmplpolavgC3.s1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/12/2004 | 0000 | 10/17/2008 | 0627 |
Subject: | TWP/SMET/C3 - Wind Speed data contain offset due to induced voltage |
DataStreams: | twpsmet60sC3.b1 |
Description: | The marine model of the RM Young wind sensor needs twisted pair shielded cable. The manufacturer did not originally supply the pigtail with twisted pair shielded cable. Use of twisted pair shielded cable for the rest of the cable run to the logger was also not specified. This caused an induced voltage in the wind speed line from the wind direction excitation. The induced voltage varied from sensor to sensor and probably changed anytime the cable was replaced or parts of the wind sensor were repaired or replaced. The induced voltage has been seen to vary from 0.15 m/s to as much as 1.08 m/s. |
Measurements: | twpsmet60sC3.b1:
|