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|
|HOBA||Wind Speed at 2 m||2015-02-28 13:50:09||Wind speed at 2 meters sometimes reports 0 during warm, ice-free periods when 10 meter wind speed is 4 m/s. Suspect starting threshold problem.|
|KIN2||Wind Speed at 2 m||2015-02-25 18:15:21||Wind speed at 2 meters sometimes reports 0 during warm, ice-free periods when 10 meter wind speed is 4 m/s. Suspect starting threshold problem.|
|WASH||Wind Direction at 10 m||2015-02-18 22:36:32||Sensor sometimes causes errantly high wind gusts during precipitation. Replace sensor.|
|APAC||Wind Direction at 10 m||2015-02-18 22:33:20||Sensor sometimes causes errantly high wind gusts during precipitation. Replace sensor.|
|GUTH||Wind Direction at 10 m||2015-02-16 18:18:00||Sensor sometimes induces errant wind gust measurements during precipitation.|
|BUTL||Soil Temperature at 5 cm under Native Vegetation||2015-02-08 01:05:36||Soil temperature at 5cm under sod suddenly reports much larger diurnal variation than expected and soil moisture data show errantly dry values. Suspect sensor exposed or damaged.|
|EUFA||Soil Temperature at 5 cm under Native Vegetation||2015-01-08 21:44:42||Sod temperature at 5cm has similar diurnal variation as 10cm sod temperature and peaks at similar time as 10cm sod and bare temperature. Suspect sensor at incorrect depth.|
|FORA||Soil Temperature at 5 cm under Native Vegetation||2015-01-06 21:03:58||Soil temperature at 5cm has similar diurnal variation as 10cm soil temperature under sod and peaks at same time as 10cm soil temperature under bare and sod. Suspect sensor is at incorrect depth.|
|ALV2||Soil Temperature at 5 cm under Native Vegetation||2015-01-06 16:19:04||5cm sod temperature peaks at same time as 10cm bare and sod temperature. Suspect sensor is at incorrect depth.|
|MANG||229L Delta Temperature at 5 cm||2014-12-02 22:00:20||5cm soil moisture sensor does not moisten or dry as much as 10cm bare and sod.|
|WEST||Soil Temperature at 5 cm under Native Vegetation||2014-10-29 17:49:15||5cm sod temperature has less diurnal variation than 10cm sod and neighbors. Suspect sensor at incorrect depth.|
|FORA||229L Delta Temperature at 60 cm||2014-10-28 13:22:49||Soil moisture at 60cm stopped heating. Starting and final temperature approximately the same value. Soil temperature data are fine.|