DQR ID | Subject | Data Streams Affected |
---|---|---|
D071105.1 | TWP/SMET/C3 - ORG overestimated rainfall | twpsmet60sC3.b1 |
D080225.1 | TWP/SMET/C3 - Upper Wind Sensor Data Questionable | 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 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/02/2007 | 1855 | 11/02/2007 | 2010 |
Subject: | TWP/SMET/C3 - ORG overestimated rainfall |
DataStreams: | twpsmet60sC3.b1 |
Description: | Optical rain gauge (ORG) measured approximately 10mm higher than two co-located tipping bucket rain gauges and a co-located disdrometer. The ORG is typically higher but usually not by an order of magnitude. |
Measurements: | twpsmet60sC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/05/2008 | 0000 | 02/27/2008 | 0315 |
Subject: | TWP/SMET/C3 - Upper Wind Sensor Data Questionable |
DataStreams: | twpsmet60sC3.b1 |
Description: | The wind_up vs. wind_low wind directions diverged, with the differences between the two eventually reached 45 degrees. The Upper sensor was found to be mis-aligned and loose. |
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:
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