摘要
利用NCEP再分析资料、Micaps资料、高空探测资料和观测资料，对2015年4月6～9日持续连阴雨天气过程发生时的环流形势、水汽及垂直结构进行了分析，研究这次连阴雨过程的形成原因。结果表明，从形势上分析，这次过程的主要影响系统是冷锋和南支槽；乌山阻高的形成有利于环流形势的稳定维持以及冷空气的堆积。地面冷空气呈东路不断渗透南下影响九江地区，导致该地区气温持续偏低，出现倒春寒。此次过程冷空气以中路路径为主，冷空气从蒙古经我国华北补充南下，冷锋在南岭停留3d后南移出海，贝加尔湖以西的高压脊稳定维持，为低涡后部冷空气南下提供通道，使得冷空气可以持续下滑至江南，形成倒春寒。垂直结构分析显示，这次过程中低层辐合中心和高层辐散中心基本垂直且与强降水区相对应，说明辐合辐散场的垂直配置有利于产生较强或较稳定的降水；且高空急流的动量下传和高纬度地区的冷空气持续南侵也为湖南连阴雨的产生提供有利条件。
Abstract
By using the NCEP reanalysis data, Micaps data, High altitude detection data and observational data, we analyzed the circulation fea-ture, water vapour and vertical structure by continuous rain weather process from April 6 to 9, 2015.The formation causation of this continuous rain weather process was researched.Results showed that the main effect system of this process was cold front and south trough .The form of ural blocking high was helpful to the stability of circulation feature and the accumulation of cold air .The ground cold air continuously penetrated southward and affected Jiujiang Area, which led to the continuous low temperature and late spring coldness in this area .In this process, cold air was mainly the middle path.The cold front stayed in Nanling for 3 d and moved out of the sea.High-pressure ridge west of the Baikal Lake was stable, so that the cold air moved the regions south of the Yangtze River and formed late spring coldness .Vertical structure analysis showed that in this process, low convergence center and high divergence center were basically vertical and was corresponded to strong precipitation area, indi-cating that the vertical allocation of convergence and divergence fields was helpful to produce relatively strong or stable precipitation .The down-load momentum of upper-level jet stream and the cold air invading of high latitude area also provided favorable conditions for the production of continuous rain in Hunan Province .
基金项目
2012年公益性行业(气象)科研专项(GYHY201206004)
中国气象局气象关键技术集成与应用项目(CMAGJ2013M74)
中国气象科学研究院灾害天气国家重点实验室2012年开放课题(2012LASW－B01)
2012年开放课题南京雷达气象与强天气开放实验室2012年研究基金(BJG201205)
国家科技期刊平台
NSTL
维普
万方数据