三维超声风速仪观测中风向角计算方法

Method for Calculating Wind Direction in Measurement Using 3D Sonic Anemometer

在对三维超声风速仪观测资料处理中,风向角的计算具有一定的技巧性。根据三维超声风速仪自身观测坐标系统与地理坐标系之间的差异,推导出计算地理坐标系下风向角的一种方法,为超声风观测资料的处理和应用提供借鉴。同时利用锡林浩特国家气候观象台2008年全年通量观测资料对风向角进行了计算,并与台站统计资料进行了对比,结果表明两组数据无论从风向角分布趋势还是从相关性来看,均非常吻合(相关系数为0.97),从而证明了该方法的正确性及可应用性。

While processing the data obtained by three dimensional sonic anemometers,it is skillful to calculate the wind direction.Based on the difference between the coordinate system of an instrument and the geographic coordinate system,a method for calculating wind direction is presented.The data collected from the Xinlinhot flux tower is used to validate the method.Comparing the wind direction calculated by the method with that from observed,the distributions of the two data sets match well and there is a high correlation between them with the correlation coefficient being 0.97.It is suggested that the method can be used for reference in processing and applying the data measured by sonic anemometers.