2007年辽宁省特大暴风雪形成过程与危害

2007年3月初辽宁发生了有气象记录以来最大的暴风雪灾害。在对2007年3月3—5日辽宁特大暴风雪和寒潮天气全面调查的基础上,系统分析了这次天气的强度、时空分布、形成过程和造成的危害。结果表明:本次暴风雪在辽宁省绝大部分地区出现了强降雪、降温及大风的天气特征,其中48h内全省平均积雪达20cm以上,最大降水量达106mm;最大风速为32m.s-1;主要的天气过程是500hPa高空槽、850hPa急流和切变及地面气旋的共同作用所致。这次特大暴风雪灾害给全省各行业造成了极大的经济损失。针对这场灾害的特点,提出了减轻和应对类似暴风雪灾害的建议和相应措施。

Formation process of extraordinarily serious snowstorm and its induced damage in 2007 in Liaoning Province

On March 4th 2007, an extraordinarily serious snowstorm occurred in Liaoning Province. Based on an overall investigation of the snowstorm, a systematic analysis was made on the intensity, spatiotemporal distribution, formation process, and induced damage of this system. The results showed that this snowstorm covered most parts of Liaoning Province, synoptic with the characteristics of heavy snow, low temperature and strong wind. The mean thickness of snow cov- er was more than 20 cm, maximum precipitation was up to 106 mm, and maximum wind velocity reached 32 m.s^-1. The formation of the snowstorm was due to the upper trough at 500 hPa, high level jet stream and shear transformation at 850 hPa, and ground cyclone. This snowstorm caused great losses in agriculture and industry. Some suggestions and measures for mitigating and responding the similar snowstorms were put forward.