一次飑线形成的数值试验

本文选取行星边界层几个不同的水平温度梯度、不同的相对湿度以及地面热力分布不均匀值,用二维数值模式对一次飑线过程进行研完,其结果表明:水汽凝结潜热是对流运动发展的重要能量来源,边界层内水平温差是对流发展的重要触发条件,地面热力条件只有在有利条件配合下才可能起明显的作用。

A NUMERICAL STUDY OF THE DEVELOPMENT OF SQUALL LINE

The development of squall line is studied by using a 2-dimensional model and selecting several magnitudes of horizontal temperature gradient in the planetary boundary layer (PBL), relative humidity and the nonuniform distribution of ground temperature. It is shown that water vapor latent heat is the major, source of energy for the development of convective motion, horizontal temperature gradient in the PBL serves as an important trigger and only under favorable conditions can ground heating exert an appreciable effect on squall line.