下垫面热源对降水的作用研究

本文通过对北京北部山区夏季、渤海及黄海北部冬、春、秋季，下垫面热源对北京的冰雹、山东半岛（及海岛）的降雪、冰雹天气的影响进行分析，阐明下垫面热源作用，在一定天气形势下可产生对流性降水天气。这种天气形势一般是高空有较强冷空气活动且低层也较冷，下垫面热源才容易起作用。此外，考虑下垫面热源作用的同时，要注意与其配合的水汽来源问题。

A STUDY OF THE EFFECT OF UNDERLYING SURFACE HEAT SOURCE ON PRECIPITATION

In this paper,we analyze the effect of underlying surface heat source on sum-mer hail in northern mountain area of Beijing,and on snow and hail,during spring,autumn,and winter,in Shandong peninsu1a in the Bohai Sea and the northern part of the Yellow sea,to clarify that underlying surface heat source can lead to convective precipitation in someweather circumstances. Violent layer is the common characteristic of these weather circum-stances, under which underlying surface heat source can properly function. In addition, thesurface of moisture cooperating with underlying surface heat source should also be consid-ered.