DQR ID | Subject | Data Streams Affected |
---|---|---|
D051209.4 | TWP/VCEIL/C3 - Degraded hardware | twpvceil25kC3.b1 |
D051216.6 | TWP/VCEIL/C3 - ceilometer lost sensitivity | twpvceil25kC3.b1 |
D060220.3 | TWP/MMCR/C3 - MMCR Power Monitor failure | twpmmcrcalC3.a1, twpmmcrpowC3.a1 |
D061011.4 | TWP/SMET/C3 - Reprocess: Tipping bucket rain gauge added | twpsmet60sC3.b1 |
D080428.3 | TWP/SMET/C3 - Reprocess: ORG Data has very small rainrate values | twpsmet60sC3.b1 |
D081022.8 | TWP/SMET/C3 - Wind Speed data contain offset due to induced voltage | twpsmet60sC3.b1 |
D090515.1 | TWP/SMET/C3 - Reprocess: Temperature Biased low by 1.06 Degrees | twpsmet60sC3.b1 |
D100215.6 | TWP/VCEIL/C3 - Reprocess: Incorrect serial_number and sum_backscatter fields | twpvceil25kC3.b1 |
D120228.8 | TWP/MPLCMASK/C3 - Cloud layer information in the header is misleading | twp30smplcmask1zwangC3.c1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/16/2005 | 0000 | 12/12/2005 | 0505 |
Subject: | TWP/VCEIL/C3 - Degraded hardware |
DataStreams: | twpvceil25kC3.b1 |
Description: | It appears that the sensitivity of the Darwin ceilometer was degrading over a few month period leading up to September 2005. Beginning on September 16, 2005, the instrument shifted to a particularly bad state. Looking at the backscatter data, I do not see nearly as great a day-night difference in the background as I expect and there is very little sensitivity to clouds. There was cross talk error noted with that instrument. The ceilometer was replaced on December 12. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/16/2005 | 2300 | 12/12/2005 | 0500 |
Subject: | TWP/VCEIL/C3 - ceilometer lost sensitivity |
DataStreams: | twpvceil25kC3.b1 |
Description: | ceilometer sesitivity decreased suddenly and only very strong cloud reflections are observed in the first kilometer. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/01/2005 | 0100 | 11/04/2005 | 0600 |
Subject: | TWP/MMCR/C3 - MMCR Power Monitor failure |
DataStreams: | twpmmcrcalC3.a1, twpmmcrpowC3.a1 |
Description: | During this period, the transmit power monitor on the TWTA was not working. This resulted in the power level reading staying at a steady state (approximately 49 dBm). Normal transmitter fluctuations are expected to be on the order of +/- 0.3 dBm. |
Measurements: | twpmmcrcalC3.a1:
twpmmcrpowC3.a1:
|
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 |
---|---|---|---|
05/01/2004 | 0000 | 06/30/2010 | 2359 |
Subject: | TWP/SMET/C3 - Reprocess: ORG Data has very small rainrate values |
DataStreams: | twpsmet60sC3.b1 |
Description: | The ORG data is collected via analog signal and not digital. Therefore, we continuously collect data even when no rain is occurring. We also capture small events such as leaves, large bugs, dust, etc blowing through the measurement path. Because this discrete event occurs quickly the value is usually captured for 1 or 2 seconds. This value is then averaged to the minute producing rainrate on the order of .009 mm/hr or less. These values are not indicative of rain and should be removed from the record or summing over long periods can bias the climate record. We will reprocess the data to remove these small values. |
Measurements: | twpsmet60sC3.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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/19/2005 | 0420 | 04/04/2009 | 0115 |
Subject: | TWP/SMET/C3 - Reprocess: Temperature Biased low by 1.06 Degrees |
DataStreams: | twpsmet60sC3.b1 |
Description: | The temperature of the SMET system was biased low by 1.06 Deg C due to a non-precision resistor being used int he measurement circuit. The data will be reprocessed. Saturation Vapor pressure and Vapor pressure will have to be reprocessed also. Add 1.06 degrees to the temperature data. Correct Sat Vap Press using the Buck approximation: Es = 6.1121exp((17.502*T)/(240.97 + T) where T is the temperature in C. Correct Vapor pressure using: E = (RH*Es)/100 |
Measurements: | twpsmet60sC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/27/2002 | 0000 | 10/31/2009 | 2359 |
Subject: | TWP/VCEIL/C3 - Reprocess: Incorrect serial_number and sum_backscatter fields |
DataStreams: | twpvceil25kC3.b1 |
Description: | Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/08/2002 | 0000 | 08/24/2006 | 2359 |
Subject: | TWP/MPLCMASK/C3 - Cloud layer information in the header is misleading |
DataStreams: | twp30smplcmask1zwangC3.c1 |
Description: | The comment in the header for cloud_base_layer indicates that the value of -1 indicates that no cloud is detected. For the above time range, a value of 0 indicates that no cloud is detected. |
Measurements: | twp30smplcmask1zwangC3.c1:
|