河北省沙尘暴天气成因分析

分析了河北省沙尘暴天气的演变特征，在此基础上又从气候及大气环流形势变化、动力诊断等方面对河北省沙尘暴天气成因进行了初步分析。结果表明：近年来河北省地区春季降雨持续偏少，气温持续偏高，为沙尘暴的形成提供了有利条件；而有利的大气环流形势和较强冷空气频繁南下是造成沙尘暴明显偏多的主要原因。

Analyses on Cause of Sand Storm Weather Formation in Hebei Provice

First, the evolution characteristic of sand storm occurring in Hebei Provice is analyzed, then the cause of formation of the sand storm is analyzed from the climate, the change of circulation situation and dynamic diagnosed and so on. The result are as follows: in recent years, the precipitation in springtime was continually less than the normal, and the air temperature in springtime was continually higher than the normal in this region, which provided the favourable conditions for sand storm occurring; the stronger cold air flow frequently move to the south is the main reason that the sandstorm is more than the normal.