DQR ID | Subject | Data Streams Affected |
---|---|---|
D060113.1 | TWP/VCEIL/C3 - low receiver sensitivity | twpvceil25kC3.b1 |
D060426.8 | TWP/SMET/C3 - ORG data noisy due to degraded ground | twpsmet60sC3.b1 |
D060629.1 | TWP/MMCR/C3 - Diminished Reflectivity Sensitivity | twpmmcrmomC3.b1, twpmmcrspecmomC3.a0 |
D061011.4 | TWP/SMET/C3 - Reprocess: Tipping bucket rain gauge added | twpsmet60sC3.b1 |
D070112.3 | TWP/MMCR/C3 - Reprocess: Height Error | twpmmcrmomC3.00, twpmmcrmomC3.b1, twpmmcrspecmomC3.a0 |
D081022.8 | TWP/SMET/C3 - Wind Speed data contain offset due to induced voltage | twpsmet60sC3.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/12/2005 | 0555 | 05/18/2006 | 2300 |
Subject: | TWP/VCEIL/C3 - low receiver sensitivity |
DataStreams: | twpvceil25kC3.b1 |
Description: | The ceilometer reported frequent receiver alarms. There are periods when the receiver sensitivity dropped to about 50%. The problem was corrected by replacing the instrument with a spare. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/01/2005 | 0000 | 08/24/2006 | 2359 |
Subject: | TWP/SMET/C3 - ORG data noisy due to degraded ground |
DataStreams: | twpsmet60sC3.b1 |
Description: | SMET Rain Data began to be noisy during December 2005 and the problem slowly became worse over time so that in February 2006 the ORG was reporting with a constant background value of around 0.10 mm/hr rain rate. ORG voltage showed a near constant value above the 85mV threshold. The ground for the ORG had become degraded and was lost due to corrosion. |
Measurements: | twpsmet60sC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/02/2005 | 0000 | 07/18/2006 | 2359 |
Subject: | TWP/MMCR/C3 - Diminished Reflectivity Sensitivity |
DataStreams: | twpmmcrmomC3.b1, twpmmcrspecmomC3.a0 |
Description: | Radar sensitivity was diminished by approximately 15 - 20 dBZ during this period. The result is that upper level cloud tops may be missed and thin clouds, particularly thin cirrus, may not be detected during this period. Reflectivity was correctly calibrated, so values are correct where signals were detected. The problem was caused by lightning damage to the low noise amplifier (LNA). The LNA was replaced on 20060718. |
Measurements: | twpmmcrspecmomC3.a0:
twpmmcrmomC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/12/2002 | 0000 | 09/26/2006 | 1435 |
Subject: | TWP/SMET/C3 - Reprocess: Tipping bucket rain gauge added |
DataStreams: | twpsmet60sC3.b1 |
Description: | A tipping bucket rain gauge was added to the SMET suite of instruments effective 20060926. Two new variables (count and rain amount) were added at the end of the twpsmet60sC1.b1 datastream. When reprocessing of this datastream occurs these variables will be added with -9999 (missing) as the value for dates prior to gauge installation. |
Measurements: | 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 |
---|---|---|---|
03/12/2002 | 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:
|