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|
|TALI||Rain since midnight UTC at 0.6m||2019-01-11 19:58:05||Primary rain gauge often 5-10% higher than secondary gauge. Expected difference based on drip tests is 0-3%. Replace cover. Both gauges sometimes independently miss the start of rain events. Replace both rain gauge cables and clean connectors. Data flagged as needed.|
|BIXB||229L Delta Temperature at 5 cm||2019-01-08 20:33:12||5 cm sod reports out-of-range values for starting, final, and averaged soil temperature.|
|OILT||Rain since midnight UTC at 0.6m||2019-01-02 16:50:42||Primary gauge records less than expected. If no clog found, check cables/connections for damage.|
|OKCE||229L Delta Temperature at 10cm under Sod||2018-12-20 22:00:15||10-cm under sod sensor stopped heating. Starting and final temperatures are the same. Average soil temperature is fine.|