Comparison of differences between wind direction anemometer and manual observation
Wind direction and wind speed are an important part of the natural climate. Their existence not only responds to the characteristics of atmospheric circulation, but is also one of the parameter indicators and energy sources for climate comparison in different places. For the observation of wind speed and wind direction, due to the differences in equipment, observation methods and measurement principles between wind anemometers and manual ones, it is inevitable that there will be differences in the observed values between them. Then the size of this difference and the reasons for the difference are worth exploring.
In the process of automating atmospheric detection, parallel observations are required for a certain period of time. Under unified climate data archiving and management principles, the quality of the observation data is evaluated to ensure the uniformity of historical data. Among the many reasons for the non-uniformity of climate data series, changes in wind direction anemometers are an important factor. The automatic values are on average 0.46m.s-1 higher than the manual observation values; compared with the manual observation values, the ones that are consistent account for 5.52% of the total number of effective comparison samples, and the ones that are greater than that account for 72.42% of the total number of valid comparison samples.
Both the wind direction anemometer and manual observation at the reference climate station are carried out 24 times a day. The automatic station uses a fast response and starts the measurement of wind direction and anemometer, while the manual station uses an electrically connected wind direction and anemometer. Wind direction and anemometers and manual observation sensors are installed in the same observation site, arranged in rows from east to west, 20m apart from each other, on wind poles or wind towers with a height of 10-12m in the observation site.
Statistics on the difference between the automatic measurement and manual observation of each wind speed item by the wind direction and anemometer can be seen. The automatic observation values of each wind speed item are on average higher than the manual observation values, and the higher value is between 0.06-0.46m.s-1. time, within the deviation range of wind speed measurement accuracy; the wind direction and anemometer observed values are greater than the manual observation values in most of the observation comparison samples, and the proportion of wind direction and anemometer and manual observation wind speed values are consistent or smaller than that is relatively low. This is an important comparative test for the recognition of accuracy in the application and promotion of wind direction and anemometers.
