洞庭湖湖陆风特征与降水

本文利用洞庭湖周围岳阳、常德和益阳三站1、4、7、10月的气象资料,研究了洞庭湖湖陆风的气候特征及其对降水、特别是对暴雨的影响。分析表明洞庭湖的湖陆风是显著的,湖陆风厚度大约为300米;湖陆风转换可以引起湖陆风散度和涡度的变化,从而引起清晨和傍晚降水的加强;一年四季都有湖陆风,但夏季更为显著,冬季不太明显。

CHARACTERISTIC FEATURE OF THE LAKE-LAND BREEZE AND ITS EFFECT ON PRECIPITATION OVER THE DONGTINGHU LAKE

In this paper the climatic characteristic feature of the lake-land breeze over the Dongtinghu Lake and its effect on heavy rain are studied by using the meteorological data from the Yueyang, Changde and Yiyang Stations around the lake. It is shown from the analysis that the lake-land breeze occurring over the Dongtinghu Lake is remarkable, about 300m in thickness. It is found that the reverse of the lake and land breezes can cause variations in divergence and vorticity of the breezes. As a result, the precipitation can be intensified around the lake in the early morning and evening. It is also found that the lake-land breeze develops throughout the year. However, it is strong in summer and weak in winter.