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|
|WEST||229L Delta Temperature at 10cm under Bare Soils||2016-05-25 20:59:01||Soil moisture at 10cm under bare is reporting errant spikes in data due to a lightning strike. Please replace sensor.|
|WEST||229L Delta Temperature at 25 cm||2016-05-25 20:05:14||Soil moisture at 25cm stopped heating due to a lightning strike. Starting and final temperatures are the same. Soil temperature looks fine.|
|TULN||229L Delta Temperature at 60 cm||2016-05-25 13:11:23||60cm sensor stopped heating. Starting and final temperatures are the same. Soil temperature looks fine.|
|APAC||Soil Temperature at 5 cm under Native Vegetation||2016-05-24 20:30:31||Soil temperature at 5cm under sod is too shallow. Please rebury sensor.|
|CENT||Soil Temperature at 5 cm under Native Vegetation||2016-05-24 20:27:24||Soil temperature at 5cm under sod peaks after soil temperature at 10cm. Please rebury the sensor.|
|CARL||Air Temperature at 1.5 m||2016-05-23 18:04:40||1.5m fast response air temperature sensor sometimes has a 1-5C low bias. During daytime, bias only lasts a few minutes. At night, bias lasts for several hours. Please rewire all connections associated with TAIR.|
|VINI||Rain since midnight UTC at 0.6m||2016-05-12 15:41:26||Primary rain gauge started reporting less than secondary rain gauge and sometimes does not report precipitation when rain moves over site.|
|STUA||229L Delta Temperature at 25 cm||2016-05-06 16:38:58||25cm soil moisture sometimes reports errant spikes. Data flagged as needed. Replace sensor.|
|TIPT||229L Delta Temperature at 10cm under Sod||2016-04-27 20:43:26||Sensor does not moisten as much as expected when exposed to moisture. Moist extreme gradually changes over time. Replace sensor.|