摘要
为研究华东地区台风降水、台风内核降水特征及大尺度环流对台风内核降水分布的影响,利用国家气象信息中心提供的逐日降水观测资料、NCEP/NCAR(National Centers for Environmental Prediction/National Center for Atmospheric Research)再分析资料,运用动态合成分析方法,对比分析台风登陆过程中台风内核降水分布不同的两类台风(L型、R型内核降水台风)大尺度环流特征。结果表明:(1)影响华东地区的台风主要在夏季登陆,台风登陆及带来极端降水的次数都具有“单峰型”的月际分布特征,降水分布从沿海向内陆、由南向北逐渐递减。(2)台风内核降水具有不对称性,强降水更易出现在高低空辐散辐合场相配合且上升运动维持较好的一侧。(3)L型内核降水台风主要受暖平流控制,环流西部存在多个冷平流中心,冷暖平流交汇增强了大气对流不稳定性,为降水提供了不稳定能量;R型内核降水台风登陆后主要受冷平流控制,环流东北部存在暖平流,冷暖平流相互作用使大气稳定度降低,有利于路径右侧降水发生。(4)L型内核降水台风在其环流西南部存在强水汽辐合,有利于路径左侧降水发生;R型内核降水台风在登陆期间,环流东北部水汽辐合中心维持时间长,有利于路径右侧降水系统的发生发展。高低空辐散辐合配置、冷暖平流以及水汽输送是影响台风内核降水分布的主要因子。
In order to study the characteristics of typhoon precipitation and typhoon core precipitation in East China and the influence of large-scale circulation on the distribution of typhoon core precipitation, this paper uses the daily precipitation data from the National Meteorological Information Center and reanalysis data from NCEP/NCAR(National Centers for Environmental Prediction/National Center for Atmospheric Research), applies the dynamic synthesis analysis method, compares and analyzes the large-scale circulation characteristics of two types of typhoons(The L-type and the R-type core precipitation typhoons) with different distributions of precipitation during typhoon landing. The results are as follows:(1) Typhoons mainly landed in summer in East China, and the times of typhoon landing and extreme precipitation caused by typhoon had the characteristics of “single-peak mode” in monthly distribution. The precipitation gradually decreased from coastal to inland, from south to north.(2) The precipitation in the typhoon core was asymmetrical, and the heavy precipitation was more likely to occur on the side with the coordination of divergence and convergence field and the better maintenance of ascending motion.(3) The L-type core precipitation typhoon was mainly controlled by warm advection. There were multiple cold advection centers in the west of circulation. Cold and warm advection intersection enhanced the atmospheric convective instability and provided unstable energy for precipitation. R-type core precipitation typhoon was mainly controlled by cold advection after landing.In the northeast of circulation there were warm advections, and the atmospheric stability dropped due to the cold and warm advections interaction. It was beneficial to precipitation on the right side of the path.(4) Strong water vapor convergence existed in the southwest of the L-type core precipitation typhoon, which was conducive to the occurrence of precipitation on the left side of the path. During the landfall of R-type core precipit
作者
郑林晔
谌芸
冯恬
姚梦颖
ZHENG Linye;CHEN Yun;FENG Tian;YAO Mengying(Fujian Meteorological Observatory,Fuzhou 350008,China;National Meteorological Centre,Beijing 100081,China;Fujian Key Laboratory of Severe Weather,Fuzhou 350008,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,Guangdong,China;Haikou Meteorological Bureau of Hainan Province,Haikou 571100,China;Zhejiang Institute of Meteorological Sciences/Chinese Academy of Meteorological Sciences,Zhejiang Branch,Hangzhou 310008,China)
出处
《干旱气象》
2022年第3期424-435,共12页
Journal of Arid Meteorology
基金
国家重点研发计划(2017YFC1502501)
国家自然科学基金项目(41975001)共同资助。
关键词
台风内核降水
华东地区
合成分析
typhoon core precipitation
East China area
synthesis analysis
