大气科学2017，Vol.41Issue(2)：385-394,10.DOI:10.3878/j.issn.1006-9895.1605.16129
登陆热带气旋在鄱阳湖区的活动特征及原因分析
Characteristics of Landfalling Tropical Cyclone Activities over the Poyang Lake Basin and Mechanisms Analysis
摘要
Abstract
The Poyang Lake basin is one of the inland areas in China that are under the most frequent influences of post-landfall tropical cyclones (TC).The interaction between TC and the underlying surface over this region is investigated using the TC best track data,surface and sounding observations and global meteorological re-analysis data.Statistical analysis of the data from 1949-2012 shows that the moving speed of TC reduced once they entered the Poyang Lake basin and their decaying rate became lower while the associated precipitation increased.Analysis of large-scale circulation indicates that TC entering Poyang Lake basin were located at the "saddle region" formed between the Pacific subtropical high and East Asian continental high.The weakened steering flow and reduced vertical shear of horizontal winds in the "saddle region" are favorable for the slowing of TC movement and decaying rate and precipitation increase.Several typical TC cases are selected to further examine the condition changes in the underlying surface during periods of TC influence.It is found that both the top layer soil temperature and lower atmosphere temperature decreased with reduced diumal variations,while the soil water content and air humidity increased obviously due to the rainfall induced by TC.Relatively large heat storage over the Poyang Lake basin is favorable for the maintaining of TC.The convective available potential energy (CAPE) decreased significantly over this region under the impact of TC,indicating that TC triggered the release of CAPE and thus increased rainfall.关键词
登陆热带气旋/鄱阳湖/维持/降水增幅Key words
Landfalling tropical cyclone/Poyang Lake/Maintenance/Rainfall increase分类
天文与地球科学引用本文复制引用
麦子,李英,魏娜..登陆热带气旋在鄱阳湖区的活动特征及原因分析[J].大气科学,2017,41(2):385-394,10.基金项目
国家重点基础研究发展计划(973计划)项目2015CB452804,国家自然科学基金项目41175063、41475055、41275066 National Basic Research Program of China (973 Program) (Grant 2015CB452804),National Natural Science Foundation of China (Grants 41175063,41475055,and 41275066) （973计划）
