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近40年夏季江苏引发暴雨的江淮气旋统计分析
(1.常州市气象局;2.江苏省气象科学研究所;3.南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心)
Statistical Analysis of Jiang-huai Cyclone Causing Jiangsu Regional Rainstorm in Summer Nearly 40 Years
(1.Changzhou Meteorological Bureau;2.Jiangsu Institute of Meteorological Sciences;3.Key Laboratory of Meteorological Disaster,Ministry of EducationKLME/Joint International Research Laboratory of Climate and Environment ChangeILCEC/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersCIC-FEMD,Nanjing University of Information Science Technology)
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投稿时间:2018-01-24    修订日期:2019-03-29
中文摘要: 本文使用Lu(2017)改进的温带气旋识别和追踪方法得出的江淮气旋资料,统计分析了近40年夏季江苏引发暴雨的江淮气旋概况、路径、形势特征和对应暴雨的主要落区。结果表明,夏季江淮气旋造成江苏暴雨的频次空间上在江淮之间最多,并向北和向南依次递减;时间上在6月份最多,约占该月暴雨总次数的1/3。致暴江淮气旋暴雨落区与江淮气旋的路径有一定的对应关系,在淮北和江淮地区,暴雨在致暴江淮气旋过境地区均匀分布,但在苏南地区,暴雨主要集中在苏南的中西部。致暴江淮气旋天气形势可分为偏西气流型和低槽型两类,其中低槽型出现的次数约为偏西气流型的2倍。偏西气流型暴雨区位于500 hPa南侧暖湿的西南气流与北侧西北气流的过渡带中,低槽型暴雨区位于槽前西南气流中。850 hPa两种类型基本相似,都为闭合的低涡,且低涡位置相比于700 hPa明显南移。江淮和苏南地区的暴雨落区大都位于700 和850 hPa低涡中心的南侧、700 hPa急流的北部和850 hPa急流的北侧。偏西气流型和低槽型造成的暴雨范围基本相当,但低槽型产生的暴雨量要大于偏西气流型。
Abstract:Using Jiang-huai cyclone data obtained from Lu (2017) improved method of identifying and tracking of extratropical cyclone, this paper statistically analyzed overview, path, circulation characteristics and corresponding rainstorm distribution of Jiang-huai cyclone which brought the regional heavy rain in summer of Jiangsu in recent 40 years. The results showed that the most rainstorms in Jiangsu province located between Yangtze and Huaihe River caused by Jiang-huai cyclone in summer. The heavy rain caused by the summer Jiang-huai cyclone was the highest in June, accounting for about 1/3 of total number of heavy rainstorms in this month. The rainstorm areas caused by Jiang-huai cyclone were related to the path of cyclone, especially in the areas of north of Yangtze River where the torrential rains were evenly distributed on both sides of the cyclone path. However, heavy rain mainly concentrated in the western and central of the cyclone path in south of Yangtze River. The circulation conditions causing heavy rain by Jiang-huai cyclone could be divided into two types, which were the westward flow and the low trough pattern and the number of low trough pattern appeared to be about twice of westward flow pattern. The heavy rain area was located in the transitional zone between warm and humid southwest airflow and northwest airflow at 500 hPa in westward flow pattern and the strong rainfall area of low trough pattern was located in southwest flow ahead of the trough. The two types of 850 hPa circulation conditions were basically similar, both of them were closed vortices, and the vortex position was obviously southward compared with 700 hPa. Most of rainstorm areas were located south of 700 and 850 hPa vortex centers and north of 700 and 850 hPa jet in south of Huaihe River. The areas of heavy rain caused by westward flow and low trough pattern were the same, but the rain caused by low trough pattern was bigger than that of westward flow pattern.
文章编号:201801240055     中图分类号:P458.1    文献标志码:
基金项目:江苏省自然科学基金(BK20161603);国家自然科学基金(41575081);江苏省科技厅科技支撑计划社会发展(BE2011818)
引用文本:
黄文彦,孙燕,卢楚翰,姚丽娜,董芹,0.[en_title][J].Meteor Mon,():-.
HUANG Wenyan,SUN Yan,LU Chuhan,YAO Lina,DONG Qin,0.Statistical Analysis of Jiang-huai Cyclone Causing Jiangsu Regional Rainstorm in Summer Nearly 40 Years[J].Meteor Mon,():-.