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|
|NRMN||Air Temperature at 1.5 m||2015-11-24 21:29:12||Air temperature at 1.5m has a 2 degree Celsius high bias compared to air temperature at 9m and neighbors. The bias occurs during the day and night, but is not a moisture bias. The bias started when the relative humidity was less than 65%.|
|CHIC||229L Delta Temperature at 5 cm||2015-11-18 17:47:49||5cm soil moisture sensor has poor response to saturated soil. Please replace sensor.|
|APAC||229L Delta Temperature at 5 cm||2015-11-18 17:46:02||5cm soil moisture sensor has poor response to saturated soil. Please replace sensor.|
|IDAB||Air Temperature at 9 m||2015-11-11 16:27:00||9m air temperature has 0.7C high bias compared to 1.5m thermometers during well mixed times (day and night).|
|ALV2||229L Delta Temperature at 5 cm||2015-11-02 16:53:51||Soil moisture sensor does not moisten as expected following rain events. Please replace sensor.|
|LANE||Soil Temperature at 10 cm under Bare Soil||2015-09-03 17:25:37||Soil temperature at 10cm under bare is too shallow. Please rebury sensor.|
|VINI||Soil Temperature at 5 cm under Native Vegetation||2015-08-06 21:30:39||Soil temperature at 5cm has the same diurnal variation as Soil temperature at 10cm under sod and they peak at the same time. Please check depth and rebury sensor.|