2008年初郴州冰冻灾害天气的机理分析

Analysis on Mechanism of Severe Freezing and Snow Weather at the Beginning of 2008 in Chenzhou

本文利用常规气象资料,对2008年初湖南郴州冰冻雨雪灾害天气的形成机理进行分析。结果表明:孟加拉湾低槽的稳定及副热带高压偏强是灾害天气发生的环流背景。而中低空长时期逆温层存在是灾害天气发生的关键。本文详细分析了郴州当地雨、冻雨、雪等冬季降水的层结状况及近地面温度等差异,对我国南方冰冻灾害天气有了进一步认识。

The mechanism of severe freezing and snow weather at the beginning of 2008 in Chenzhou of Hunan Province was studied by using conventional meteorological data.The results showed that the circulation background was with a steady trough over the Bay of Bengal and a strong subtropical high.Long-term existence of temperature inversion layer in lower and middle levels was the key factor for the disastrous weather.It was particularly analyzed on the stratification of precipitation in winter,such as rain,ice rain and snow,and the difference of near surface temperature.Thus more knowledge about disastrous freezing weather in southern China was achieved.