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|
|EVAX||229L Delta Temperature at 60 cm||2020-09-21 21:27:53||Both soil temperature and soil moisture frequently report -7999. Please replace sensor.|
|MARE||Solar Radiation||2020-09-14 21:01:24||Suspect dirty SRAD sensor. Reports values much lower than neighboring sites. Multiple rain events did not resolve problem.|
|WATO||Barometric Pressure at 0.75 m||2020-09-09 19:43:38||Barometer tubing prone to water entrapment. Please replace external tubing, and drill 2mm hole on bottom of external barometer tube 1/2 inch from enclosure.|
|TALI||Air Temperature at 9 m||2020-08-17 20:50:51||Sharp decreases in 9m air temperature during the day do not agree with TAIR/TA9MFAST. Possible insect nest on sensor.|
|BOIS||Wind Speed at 2 m||2020-08-17 20:20:03||2m wind speed often has a 2-3 m/s low bias compared to 10m wind and neighbors.|
|MIAM||229L Delta Temperature at 60 cm||2020-07-27 20:45:41||60cm soil moisture starting temperature reports around 500 C. Final temperature is -7999.|
|OILT||Soil Temperature at 30 cm under Native Vegetation||2020-07-14 15:19:55||Continuity soil temperature at 30cm under sod displays an errant step down in data. Lightning in vicinity of site when problem arose.|
|OILT||229L Delta Temperature at 10cm under Bare Soils||2020-07-14 15:13:09||Standard soil temperature at 10cm under bare soil reporting -7999. Lightning in the vicinity of site when problem arose.|
|OILT||229L Delta Temperature at 10cm under Sod||2020-07-14 15:05:28||Standard soil temperature at 10cm under sod reporting -7999. Lightning in the vicinity of site when problem arose.|
|OILT||229L Delta Temperature at 60 cm||2020-07-14 14:56:00||Soil temperature at 60cm reporting -7999. Lightning in the vicinity of site when problem arose.|
|OILT||Soil Temperature at 10 cm under Native Vegetation||2020-07-13 22:21:58||Continuity soil temperature at 10cm under sod suddenly reports values greater than 100C. Lightning in vicinity at time of problem.|
|YUKO||229L Delta Temperature at 25 cm||2020-06-29 21:34:00||Sensor no longer heating, resulting in errant soil moisture values. Soil temperature is fine.|
|NEWK||229L Delta Temperature at 60 cm||2020-06-22 21:17:46||60-cm sensor doesn't heat as expected, resulting in bad soil moisture data. Soil temperature is fine.|