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||Air Temperature at 1.5 m||2015-05-26 15:53:16||Air temperature at 1.5m develops a high bias during high humidity.|
|ACME||Rain since midnight UTC at 0.6m||2015-05-24 02:55:55||Primary rain gauge stopped measuring rain during heavy rain event.|
|SPEN||Air Temperature at 1.5 m||2015-05-22 13:37:59||Air temperature develops a high bias during high humidity and after heavy rainfall.|
|ELRE||Barometric Pressure at 0.75 m||2015-05-22 13:29:03||Pressure around 17 millibars higher than neighbor. Suspect problem with tube.|
|RETR||Wind Speed at 10 m||2015-05-19 18:57:44||Starting Threshold Problem: Wind speed at 2m is greater than wind speed at 10m during light winds.|
|BOWL||229L Delta Temperature at 60 cm||2015-05-18 20:42:20||Soil moisture and soil temperature at 60cm are reporting -7999 after a lightning strike.|
|BOWL||229L Delta Temperature at 25 cm||2015-05-18 20:40:30||Soil moisture and soil temperature at 25cm are reporting -7999 after a lightning strike.|
|PUTN||Air Temperature at 1.5 m||2015-05-17 15:27:30||Air temperature is reporting -200 degrees Celsius.|
|HUGO||229L Delta Temperature at 5 cm||2015-05-12 12:29:29||5cm sod sensor not heating as expected after lightning strike. Soil temperature data look fine. Standing water prevented replacement during tech visit.|
|SALL||Soil Temperature at 5 cm under Native Vegetation||2015-04-29 19:20:42||5cm sod temperature has more diurnal variation than neighbors. Suspect sensor is too shallow. Please replot sensor.|
|TALI||229L Delta Temperature at 5 cm||2015-03-27 15:08:18||Soil moisture at 5cm has a slow response to moisture.|
|SKIA||229L Delta Temperature at 5 cm||2015-03-27 15:03:08||Soil moisture at 5cm does not moistened as well as expected.|
|HECT||229L Delta Temperature at 5 cm||2015-03-27 15:02:11||Soil moisture at 5cm does not moistened as expected.|
|APAC||Wind Direction at 10 m||2015-02-18 22:33:20||Sensor sometimes causes errantly high wind gusts during precipitation. Replace sensor.|