Comparison of differences between wind direction and anemometer and manual observation
Wind direction and speed are important components of natural climate, and their existence not only reflects the characteristics of atmospheric circulation, but also serves as parameter indicators and energy sources for climate comparison in different places. The observation of wind speed and direction is inevitable due to the differences in equipment, observation methods, and measurement principles between the use of wind direction anemometers and manual methods. So the magnitude and reasons for this difference are worth exploring.
In the process of automated atmospheric exploration, parallel observations are required for a certain period of time. Under the principle of unified climate data archiving and management, the quality of observation data is evaluated to ensure the uniformity of historical data. Among the many reasons that lead to non-uniformity in climate data sequences, changes in wind direction and anemometer are important factors. The average deviation between automatic and manual observations is 0.46m.s-1; Compared with manual observations, the consistent values accounted for 5.52% of the total effective comparison samples, while those greater than accounted for 72.42% of the total effective comparison samples.
The wind direction and anemometer of the benchmark climate station and manual observation are conducted 24 times a day. The automatic station uses a fast response and starts the measurement of wind direction and anemometer, while the manual use of an electric wind direction anemometer. The wind direction anemometer and manual observation sensors are installed in an east-west row in the same observation field, with an east-west interval of 20m between each other, on a wind pole or tower with a height of 10-12m in the observation field.
The statistical analysis of the difference between the automatic measurement and manual observation of each wind speed item by the wind direction anemometer shows that the automatic observation values of each wind speed item are on the average higher than the manual observation values, with the higher values ranging from 0.06 to 0.46m.s-1, which is within the deviation range of wind speed measurement accuracy; The observed values of wind direction anemometer are greater than those of manual observation, accounting for the majority of observation comparison samples. The proportion of wind direction anemometer and manual observation wind speed values being consistent and less than is relatively low. This is an important comparative test for the recognition of accuracy in the application and promotion of wind direction anemometers.
