DQR ID | Subject | Data Streams Affected |
---|---|---|
D050209.15 | SGP/THWAPS/B4 - Wind Data Suspect | sgpthwapsB4.b1 |
D050812.1 | SGP/THWAPS/B4 - Minor biases in humidity and saturation vapor pressure | sgpthwapsB4.b1 |
D050913.1 | SGP/THWAPS/B4 - RH values exceeding 105% | sgpthwapsB4.b1 |
D051027.2 | SGP/THWAPS/B4 - Time uncertainty | sgpthwapsB4.b1 |
D060717.1 | SGP/THWAPS/B4 - Temp and RH data incorrect | sgpthwapsB4.b1 |
D060830.1 | SGP/THWAPS/B4 - Reprocess: RH% values 9% High | sgpthwapsB4.b1 |
D080116.23 | SGP/THWAPS/B4 - Wind Data Incorrect Due to Icing | sgpthwapsB4.b1 |
D080326.1 | SGP/THWAPS/B4 - Temp and RH values incorrect during hours of no sunlight | sgpthwapsB4.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/04/2005 | 0000 | 01/17/2005 | 2359 |
Subject: | SGP/THWAPS/B4 - Wind Data Suspect |
DataStreams: | sgpthwapsB4.b1 |
Description: | Wind speed and direction data suspect during time period due to icing. |
Measurements: | sgpthwapsB4.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/21/1999 | 0000 | 07/30/2005 | 1722 |
Subject: | SGP/THWAPS/B4 - Minor biases in humidity and saturation vapor pressure |
DataStreams: | sgpthwapsB4.b1 |
Description: | The THWAPS humidity sensor output was scaled so that the instrument output voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the co-located chilled mirror sensor at the CF suggested that the THWAPS RH sensor was reading artifically low at high humidities because of this 100 %RH maximum. The scaling of the system was changed so that 0-1 VDC now represents 0-110 %RH. This resulted in a slight loss of precision in the measurements, but since the RH measurement is only accurate to 2-3 %RH at best, this isn't a significant problem. The saturation vapor correction when temps are below 0C contained an error in the multiplier. The incorrect multiplier only equates to an error of 0.01 kPa which is less than the stated uncertainty of the measurement (+/- 0.035 kPa). |
Measurements: | sgpthwapsB4.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/06/2005 | 0000 | 10/03/2005 | 1730 |
Subject: | SGP/THWAPS/B4 - RH values exceeding 105% |
DataStreams: | sgpthwapsB4.b1 |
Description: | RH measurements were reaching the max value of 105% on a consistent basis. Spider web internal to the sensor housing was found and removed. |
Measurements: | sgpthwapsB4.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/20/2005 | 1800 | 10/21/2005 | 1500 |
Subject: | SGP/THWAPS/B4 - Time uncertainty |
DataStreams: | sgpthwapsB4.b1 |
Description: | The clock on the site collection system was incorrect when it was deployed on 10/20. The clock was corrected on 10/21 at approximately 15:02. The data collected in the interim received grossly wrong time stamps. These time stamps have been manually corrected, but there is some uncertainty in the time stamps still. Data during the period specified should be considered to be within +/- 5 minutes of the timestamp indicated. |
Measurements: | sgpthwapsB4.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/05/2006 | 1800 | 07/18/2006 | 1647 |
Subject: | SGP/THWAPS/B4 - Temp and RH data incorrect |
DataStreams: | sgpthwapsB4.b1 |
Description: | After sensor replacement the temperature values are too low. The range of the sensor was incorrectly set at -40 to 80 instead of -30 to 70. RH values are also suspect. |
Measurements: | sgpthwapsB4.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/05/2006 | 1825 | 09/26/2006 | 0000 |
Subject: | SGP/THWAPS/B4 - Reprocess: RH% values 9% High |
DataStreams: | sgpthwapsB4.b1 |
Description: | After replacement of the THWAPS T/RH sensor the span was incorrectly set to 0-100 instead of 0-110. This caused the RH values to be 9% higher than actual values. |
Measurements: | sgpthwapsB4.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/10/2007 | 2110 | 12/11/2007 | 1645 |
Subject: | SGP/THWAPS/B4 - Wind Data Incorrect Due to Icing |
DataStreams: | sgpthwapsB4.b1 |
Description: | An ice storm caused the wind data from the RM Young wind sensor to be incorrect. In many instances it was frozen and unmoving, at times it measured values but those are extremely suspect. |
Measurements: | sgpthwapsB4.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/15/2008 | 0000 | 11/05/2008 | 1745 |
Subject: | SGP/THWAPS/B4 - Temp and RH values incorrect during hours of no sunlight |
DataStreams: | sgpthwapsB4.b1 |
Description: | Unknown issues caused the temp and RH values to become lower during non-sunlight hours. The affects are best seen at sunrise and sunset when the data would adjust upward or downward abruptly. Plots of the standard deviation show abrupt spikes at these times. Comparison plots to nearby mesonet sites suggest the nighttime values of both temp and RH are lower than nearby sites. This problem was also very intermittent and was not occurring on a daily basis. A complete move of the sensors and collection system to a separate building repaired the problem. |
Measurements: | sgpthwapsB4.b1:
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