湖北省2009年冬末连阴雨过程特点及影响分析

2009年冬末湖北省出现了历史少见的长达13～19 d的连阴雨天气过程，通过实时监测数据与历史同期比较以及连阴雨极端天气气候事件指标监测，结合影响和灾情资料以及有关行业标准，对这次过程的天气气候特点、发生程度、成因和影响进行初步分析。结果表明：（1）此次连阴雨过程具有出现时间早、持续时间长、雨量大、气温低、寡照的特点，并伴有雷暴、冰雹、冻雨及雨凇等灾害，江汉平原中南部和鄂东连阴雨过程达到极端气候事件标准；（2）连阴雨过程主要是由东亚地区大气环流出现了异常变化或调整引起的；（3）连阴雨对农业、居民生活、交通、商业等产生较严重影响，并诱发局部地区的地质灾害，灾害后续效应在农业病害发生发展上已经显现。

MAIN CHARACTERISTICS OF THE CONTINUOUS OVERCAST AND RAINY PROCESS AND ITS EFFECT IN HUBEI PROVINCE IN LATE WINTER OF 2009

The singularly continuous overcast and rainy process occurred in Hubei province in late winter of 2009 which persisted 13 to 19 days.Through the real time monitoring data compared with the same period in history and the monitoring by the index of continuous overcast and rainy extreme climate event，and combined with the impact and disaster information and related industry standards，the climate characteristics，extent，causes and effects of this process are preliminarily analysed.The results are as follows：（1）The characteristics of this continuous overcast and rainy process are early occurrence，long duration，heavy rainfall，low temperature，less sunlight and followed by some disaster such as thunderstorm，hail，freezing rain，glaze ice.This process in central and southern Jianghan plain and eastern Hubei province all achieve the standards of extreme climate events；（2）The continuous rainfall process is mainly caused by the singular change and adjustment of atmospheric circulation in East Asia；（3）The continuous rainfall has serious impact on agriculture，resident，traffic，business and also induces geological disasters in parts area，and impacts after disaster has appeared on the occurrence and development of crop disease.〖