Comparison of the difference between wind direction anemometer and manual observation
Wind direction and wind speed are an important part of natural climate. Its existence is not only a response to the characteristics of atmospheric circulation, but also one of the parameters 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 the use of wind direction anemometers and manual use, 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 automatic process of atmospheric detection, parallel observations for a certain period of time are required. Under the unified climate data archiving and management principles, the quality of observation data is evaluated to ensure the uniformity of historical data. Among the many reasons for the heterogeneity of climate data series, the change of wind direction and anemometer is an important factor. The average value of automatic observation is 0.46m.s-1 higher than that of manual observation; compared with automatic observation and manual observation, the consistent value accounts for 5.52% of the total effective comparison samples, and the greater value accounts for 72.42% of the total effective comparison samples.
Both the wind direction and anemometer at the reference climate station and manual observations are made 24 times a day. The automatic station uses the fast-response and starts the determination of the wind direction and anemometer, and the manual use of the electric wind direction and anemometer. The wind direction anemometer and the artificial observation sensor are respectively installed in the same observation field in an east-west row, with a distance of 20m from east to west, on a wind mast or wind tower with a height of 10-12m in the observation field.
The statistics of the average difference between the automatic measurement and manual observation of each wind speed item by the wind direction and anemometer show that the automatic observation value of each wind speed item is higher than the manual observation value on average, and the higher value is between 0.06-0.46m.s-1 It is within the deviation range of wind speed measurement accuracy; the observed value of wind direction anemometer is greater than the manual observation value, which accounts for most of the observation comparison samples, and the proportion of wind direction anemometer and manual observation wind speed value is consistent or smaller than that. This is an important comparative test for the recognition of accuracy in the application and promotion of wind direction anemometer.
