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|
|PRYO||Rain since midnight UTC at 0.6m||2018-07-16 13:48:05||Primary rain gauge sometimes over 10% low during heavy rain events. Replace top only.|
|ADAX||Soil Temperature at 10 cm under Native Vegetation||2018-07-16 13:39:18||10 cm under sod reports -7999 for starting, final, and average soil temperature.|
|HUGO||Soil Temperature at 10 cm under Bare Soil||2018-07-13 13:44:10||10 cm under bare reports -7999 for starting, final, and average soil temperature.|
|BURB||229L Delta Temperature at 5 cm||2018-07-02 16:52:55||5 cm under sod reports either -7999 or errantly high value for starting, final, and average temp.|
|BESS||229L Delta Temperature at 10cm under Bare Soils||2018-07-02 16:41:18||STB10, FTB10, and TB10 often report errantly high values during afternoon hours when temperatures are above 35C. Suspect short is occurring. Please replace sensor.|
|PUTN||Relative Humidity at 1.5 m||2018-07-02 16:05:42||Relative humidity sometimes between 0 and expected value. Slow air temperature sometimes less than expected or NAN for extended periods of time. Sensor reset did not resolve problem. Problem did not trace to wind blown rain or extended period of high humidity.|
|WAUR||229L Delta Temperature at 25 cm||2018-06-15 15:23:08||25cm starting and final soil moisture temperature are the same. Sensor not heating. 15-minute average soil temperature is fine.|
|SEIL||229L Delta Temperature at 10cm under Bare Soils||2018-05-29 19:05:15||10cm bare soil moisture stopped heating. Final temperature same as starting temperature. Averaged soil temperature is fine.|