影响环渤海地区的北上台风特征及其各类典型大暴雨过程分析

The characteristics of northward-moving typhoons affecting the Bohai rim region and the analysis of various types of related heavy rainfall processes

利用1949—2019年热带气旋最佳路径数据、京津冀地面降水资料和NCEP再分析资料,对影响环渤海地区的北上台风及各类典型大暴雨过程进行分析。结果表明:71 a间影响环渤海地区的北上台风共47例,平均约6.6个/10 a,主要出现在7月下旬—8月,在福建、浙江到江苏南部沿海登陆次数最多,登陆转向点一般位于115°E以东。按登陆填塞、登陆北上、登陆转向、沿海路径和西折路径进行分类,登陆填塞类大暴雨区主要位于河北南部太行山前;登陆北上、登陆转向或沿海路径大暴雨主要位于京津冀的中东部,大暴雨落区与西太平洋副高、西风带系统、低空急流和地形关系密切。

Using the optimum route data during 1949 to 2019,precipitation data in Beijing-Tianjin-Hebei region and NCEP reanalysis data,the characteristics of northward-moving typhoons and various typical heavy rainfalls affecting the Bohai rim region is analyzed in this paper.The results show that there are 47 typhoons moving northward and affecting the Bohai Rim Region in the recent 71 years with an average frequency of 6.6 per decade.The typhoons mainly generate between late July and August,and make landfall in Fujian,Zhejiang and southern Jiangsu province with the turning point of landfall east of about 115°E.The typhoon routes can be classified into 5 different types,which are blocking after landing,moving northward after landing,veering after landing,moving along the coast and moving westward.For the type of blocking after landing,the heavy rainfall mainly occurs in front of Taihang Mountains in southern Hebei province.For the rest of the types except moving westward,heavy rainfall tends to be most common over the middle east of the Beijing-Tianjin-Hebei region.The region of the heavy rainfall is also closely affected by the West Pacific Subtropical High,the westerlies,low-level jet stream and topography.