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|
|HINT||Soil Temperature at 10 cm under Bare Soil||2017-10-17 14:36:53||Soil temperature and starting/final soil moisture temperature measuremetns report either -7999 or very large positive/negative values. Replace sensor.|
|CHER||Rain since midnight UTC at 0.6m||2017-10-09 14:05:54||Primary rain gauge reports significantly less than secondary gauge.|
|COOK||229L Delta Temperature at 10cm under Sod||2017-10-05 21:54:20||10cm sod final temperature sometimes slightly lower than expected. Causes fractional water values about 0.1 higher than expected. Frequently varies between normal and errant periods. Affects all times of day and both dry/moist conditions. Spikes not apparent in un-heated obs.|
|BRIS||Rain since midnight UTC at 0.6m||2017-10-04 13:37:47||Primary rain gauge suddenly stopped reporting precip during rain event and reported zero during following events.|
|MANG||Soil Temperature at 5 cm under Native Vegetation||2017-09-14 18:58:18||5cm sod temperature diurnal variation suddenly decreased. Data appear to represent 15-20cm depth.|
|WYNO||229L Delta Temperature at 5 cm||2017-08-29 20:45:30||5cm soil moisture stopped heating. Final temperature same as starting temperature.|