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|
|NEWP||229L Delta Temperature at 5 cm||2017-04-26 16:07:55||5cm sensor responds slower than expected to soil moisture. Replace sensor.|
|MAYR||229L Delta Temperature at 10cm under Bare Soils||2017-04-20 13:01:31||10cm bare final temperature over 100C or -7999. Starting temperature is fine.|
|PORT||Soil Temperature at 5 cm under Native Vegetation||2017-04-19 14:45:37||Soil temperature at 5cm has a similar diurnal variation to soil temperature at 10cm. Suspect the 5cm sensor is at the incorrect depth. Please rebury the sensor.|
|ACME||Soil Temperature at 5 cm under Native Vegetation||2017-04-19 14:40:17||Soil temperature at 5cm has a less diurnal variation than soil temperature at 10cm. Suspect 5cm sensor is at incorrect depth. Please rebury sensor.|
|ACME||229L Delta Temperature at 10cm under Sod||2017-04-18 14:58:46||10cm sod soil moisture sensor does not heat properly. Final temperature slightly less than starting temperature.|
|WASH||Wind Direction at 10 m||2017-04-05 20:40:19||Dr. Chilson reports consistent 8-degree wind direction bias compared to UAV sensor. Please use transit to verify wind direction alignment.|
|LANE||Rain since midnight UTC at 0.6m||2017-03-24 15:13:20||RAIN misses tips at the beginning of a light rain event.|
|STUA||229L Delta Temperature at 25 cm||2017-03-20 16:03:50||Soil moisture and soil temperature at 25cm is reporting -7999.|
|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.|