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|
|OILT||Soil Temperature at 10 cm under Native Vegetation||2020-07-13 22:21:58||Continuity soil temperature at 10cm under sod suddenly reports values greater than 100C. Lightning in vicinity at time of problem.|
|OILT||Rain since midnight UTC at 0.6m||2020-07-13 21:58:40||Primary gauge stopped recording tips during ongoing rain. Issue begins the same time aspirator batteries dropped to zero volts. Lightning was in the vicinity of site when issue arose.|
|BRIS||Air Temperature at 1.5 m||2020-07-13 21:33:28||1.5m Air Temperature sometimes reports values near -400F for several hours and then returns to normal. Please rewire all sensor connections.|
|EUFA||Wind Speed at 2 m||2020-07-13 21:21:17||2m wind speed sometimes reports zero when 10m winds above 3m/s.|
|BUTL||Rain since midnight UTC at 0.6m||2020-07-13 20:56:11||Primary gauge fails to record precipitation during multiple rain events.|
|MAYR||Solar Radiation||2020-07-06 21:05:59||Sometimes reports -99999. Values during day sometimes lower than expected or negative. Instrument notes indicate internal cable problem was repaired in the lab before installation at MAYR.|
|YUKO||229L Delta Temperature at 25 cm||2020-06-29 21:34:00||Sensor no longer heating, resulting in errant soil moisture values. Soil temperature is fine.|
|NEWK||229L Delta Temperature at 60 cm||2020-06-22 21:17:46||60-cm sensor doesn't heat as expected, resulting in bad soil moisture data. Soil temperature is fine.|