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江淮气旋是影响我国东部沿海地区的重要天气系统,为了弄清其发生发展机制,以便服务于预报,对其垂直速度场进行合理的诊断分析是其中的关键问题之一。但是对天气尺度系统的垂直速度场的计算也是当前天气研究的难点之一。计算垂直速度的方法有很多种,对诊断分析言,目前倾向于运动学方法,但采用这一方法的主要困难是如何处理测风不精确所带来的计算误差,最近不少人采用o’brien(1970)提议的方法对用实测风计算的垂直速度进行订正,它的基本思路是把最后的累积误差“均匀”分摊到各等压面层上去。本文根据Pearce(1974)的启示,从产生误差的气象原因着手,建立Spline方程,进行了垂直速度场的计算和订正,作为个例,本文用上述方法对一次江淮气旋的垂直速度场进行了分析,对照卫星云图和降水实况,结果还是令人鼓舞的。
The JAC cyclone is an important weather system that affects the eastern coastal areas in China. To understand its mechanism of occurrence and development in order to serve the prediction, the reasonable diagnosis and analysis of its vertical velocity field is one of the key issues. However, the calculation of the vertical velocity field of the weather scale system is also one of the difficulties in current weather research. There are many ways to calculate the vertical velocity. For the purposes of diagnostic analysis, the kinematic method is currently favored. However, the main difficulty in using this method is how to deal with the calculation error caused by inaccurate wind measurement. Recently, many people used o ’ The method proposed by Brien (1970), which corrects the vertical velocities calculated using actual winds, is based on the idea that the final cumulative error is “evenly” distributed over the isobaric surfaces. Based on the revelation of Pearce (1974), this paper starts with the meteorological cause of error, establishes the Spline equation, and calculates and corrects the vertical velocity field. As an example, this paper analyzes the vertical velocity field of an Jianghuai cyclone The results are still encouraging, as compared with the satellite imagery and precipitation.