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|
|CARL||Soil Temperature at 5 cm under Native Vegetation||2018-11-19 17:41:28||5 cm sod temperature has more diurnal variation than neighbors despite good sod coverage. Suspect sensor is too shallow. Please rebury.|
|MIAM||Barometric Pressure at 0.75 m||2018-11-16 22:09:08||Pressure samples sometimes 1-2mb too high. Most of the time, the spikes are brief enough that averaged pressure is not affected. A few times, problem lasted long enough that all samples for the 5-minute period were too high. Problem happens all times of day and weather conditions. Data flagged as needed.|
|MCAL||229L Delta Temperature at 10cm under Sod||2018-11-16 21:23:35||10cm sod soil moisture final temperature sometimes slightly less than expected. Causes errantly high soil moisture readings. Starting and average soil temperatures look fine.|
|HUGO||Rain since midnight UTC at 0.6m||2018-11-09 17:15:12||Primary gauge records rain slower than expected, and continues to tip after rain ends. Suspect clogged gauge.|
|TIPT||Soil Temperature at 10 cm under Bare Soil||2018-09-14 21:44:23||10cm bare sensor reports -7999 for soil temperature and moisture.|