doi:  10.3878/j.issn.1006-9895.1906.18180
华东登陆热带气旋降水不同分布的对比分析

Comparative Analysis of Different Precipitation Distributions of Tropical Cyclones Making Landfall East China
摘要点击 100  全文点击 25  投稿时间:2018-06-22  修订日期:2019-06-14
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基金:  41475055,41575063,气象预报业务关键技术发展专项YBGJXM(2018)1B-08和2018KJ027Funded byNational Basic Research Program of China (973 Program) (Grant 2015CB452804), National Natural Science Foundation of China (Grants41475055,41575063), Meteorological ForecastingOperationKey TechnologyDevelopment Program (Grands YBGJXM (2018)1B-08, 2018KJ027)
中文关键词:  热带气旋 华东登陆 降水 不同分布
英文关键词:  Tropical cyclones, Landfall, East China, Precipitation, Different distributions
     
作者中文名作者英文名单位
卜松Bu Song中国气象科学研究院灾害天气国家重点实验室
李英Li Ying中国气象科学研究院灾害天气国家重点实验室
引用:卜松,李英.2020.华东登陆热带气旋降水不同分布的对比分析[J].大气科学
Citation:Bu Song,Li Ying.2020.Comparative Analysis of Different Precipitation Distributions of Tropical Cyclones Making Landfall East China[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      利用CMORPH降水资料,将热带气旋(TC)登陆后的降水分为路径左侧降水(L型)和右侧降水(R型)两类,并针对登陆华东地区TC的 L型和R型降水的大气环流场、环境水平风垂直切变以及台风环流内的动热力条件进行对比分析,结果表明:2005~2014年间登陆华东地区的20例TC中包括12例L型TC和8例R型。总体来看大气环流因子对于登陆华东TC降水分布起主要作用。L型降水TC高层南亚高压主要呈纬向带状分布,在登陆过程中路径左侧维持偏东风高空辐散气流,中层西风槽偏东,西太平洋副热带高压(副高)偏南,环境水平风垂直切变指向西南。R型降水TC高层南亚高压断裂,呈经向分布。TC路径左侧风场较均匀,右侧东南风高空辐散气流明显。副高的位置偏北呈块状,同时环境水平风垂直切变指向东北,有利于路径右侧降水。台风环流内,低层冷暖平流输送以及水汽辐合与降水落区也有较好对应关系。L型TC低层暖平流的输送使TC西南象限低层增暖,大气稳定度降低。同时水汽辐合区也主要位于西南象限,有利于TC路径左侧降水。而R型TC副高位置偏北可将南侧的东南暖湿气流向台风环流更西部输送,东北象限维持暖平流,有利于路径右侧降水发生。
Abstract:
      Using CMORPH precipitation data, the precipitation of landfalling tropical cyclones (TC) is classified into two categories: left side of track (L) and right side of track (R), furthermore, their atmospheric circulation field, vertical shear of ambient horizontal wind, and dynamical and thermal conditions within the typhoon circulation are compared and analyzed. The results show that during 2005-2014, there were 20 TCs landing in East China, including 12 L TCs and 8 R TCs. In general, atmospheric circulation factors play a major role in precipitation distributions of TCs making landfall in East China. During the landfall of L TCs, in the upper layer, South Asian high is zonally distributed and the flow is divergent in the left side of track area, while in the middle layer, westerly trough is to the east, and Western Pacific subtropical high (subtropical high) locates more south, with southwest vertical shear of ambient horizontal wind. In contrast, for the R TCs, South Asian High breaks and longitudinally distributes in the upper layer. In the left side of track area, wind is relatively uniform, except a strong divergent flow on the right. Subtropical high locates much more north and is blocky, and the vertical shear of the ambient horizontal wind points to northeast, which is conductive to R type precipitation. The temperature advection transportation and water vapor convergence within the typhoon circulation corresponds well with rainfall area. Warm advection makes the southwest quadrant of L TCs warmer in the lower layer, leading to decreasing atmospheric stability. At the same time, the water vapor convergent zone is also located in the southwest quadrant, contributing to precipitation on the left side of TC track. For R TCs, subtropical high locating more north can transport the warm moist southeastern flow to the west of typhoon, and the northeastern quadrant is always maintaining the warm advection, which are favorable for rainfall of right side track.
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