The Oklahoma Mesonet’s quality-assurance (QA) consists of four principal components:
1) laboratory calibration,
2) on-site intercomparison,
3) automated QA, and
4) manual QA.
In the instrument laboratory, all sensors are calibrated to validate or improve upon factory calibrations.
On an annual basis, the accuracy of several types of sensors in the field is verified through comparison to calibrated reference sensors housed in a portable system.
To make a first pass through the 640,000+ observations that are received at the Mesonet each day, automated QA software includes numerous algorithms to evaluate the data received from remote stations.
Finally, the Mesonet’s QA meteorologists employ numerous manual techniques to complement automated QA including analysis of monthly statistics to detect sensor drift or bias (click on a month and year to the left to download a PDF version of a Monthly Report). In addition to detecting problematic sensors, the QA meteorologists trace the true start time of each problem so that appropriate data can be manually flagged as erroneous. The QA meteorologists are responsible for communicating problems to, and coordinating with, appropriate field technicians to ensure proper resolution (see a list of the current outstanding tickets below).
Current Trouble Tickets in the Oklahoma Mesonet
(For questions regarding these tickets, contact )
|Station||Variable||Date Reported||Problem Description|
|WEBR||229L Delta Temperature at 10cm under Bare Soils||2017-08-16 19:02:28||Soil moisture exceeds allowed moist end. Data shifted after new current excitation installed. Unable to adjust coefficients in way that accommodates past and current data. Replace sensor.|
|ARD2||229L Delta Temperature at 10cm under Sod||2017-08-14 20:41:47||Sensor responds very slowly to moisture.|
|WIST||229L Delta Temperature at 10cm under Sod||2017-08-07 16:55:07||10cm sod soil moisture final temperature reports small, errant spikes. Soil temperature fine.|
|CAMA||229L Delta Temperature at 10cm under Bare Soils||2017-07-31 15:57:51||10cm bare soil temperature/moisture reports either 500-600C or -7999.|
|PUTN||Relative Humidity at 1.5 m||2017-07-31 13:55:04||Relative humidity reports 0 and TSLO reports NAN. Power cycling sensor did not resolve problem. Sensor error code 0000 (no error), but lists ****** for each observation in comment section.|
|IDAB||229L Delta Temperature at 10cm under Sod||2017-07-28 14:09:50||10cm sod sensor reports -7999 for all soil temperature and soil moisture readings.|
|HINT||Soil Temperature at 10 cm under Bare Soil||2017-07-26 15:32:57||10cm bare soil temperature reports 300-400C. Also affects soil moisture.|
|STUA||229L Delta Temperature at 60 cm||2017-07-25 19:20:47||60cm soil moisture stopped heating. Final temperature same as starting temperature.|
|ELRE||229L Delta Temperature at 60 cm||2017-07-24 22:01:44||60cm soil moisture final temperature sometimes higher than expected. Causes errant decrease in soil moisture data. Typically happens during rain or sometimes hours before and right after sunrise.|
|BUFF||229L Delta Temperature at 10cm under Bare Soils||2017-06-23 14:40:51||Soil moisture at 10cm under bare stopped heating. Soil temperature at 10cm under bare is fine.|
|NEWK||229L Delta Temperature at 10cm under Bare Soils||2017-06-22 19:30:01||10cm bare soil temperature and moisture sometimes report out-of-range or -7999. Problem typically starts early afternoon and lasts until couple hours after sunset. Does not happen every day.|
|TULN||Soil Temperature at 5 cm under Native Vegetation||2017-05-05 21:13:18||Soil temperature at 5cm has a similar diurnal variation to soil temperature at 10cm. Suspect soil temperature at 5cm is too deep.|
|NINN||229L Delta Temperature at 5 cm||2016-11-28 15:42:22||Final temperature for 5cm under sod increased from 15C to 28C. Starting temperature is reporting around 13C.|