Interdecadal modulation of the influence of La Nina events on mei-yu rainfall over the Yangtze River valley
Wang, X; Wang, DX; Zhou, W; Li, CY; wenzhou@cityu.edu.hk
2012
发表期刊ADVANCES IN ATMOSPHERIC SCIENCES
ISSN0256-1530
卷号29期号:1页码:157-168
摘要The aim of this study was to investigate changes in the relationship between mei-yu rainfall over East China and La Nia events in the late 1970s, a period concurrent with the Pacific climate shift, using meiyu rainfall data and the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis. This relationship was modulated by the climate shift: Before the 1977/1978 climate shift and after the 1992/1993 climate shift, mei-yu rainfall levels were above normal in most La Nia years, whereas during the period 1979-1991, mei-yu rainfall was usually below normal levels in La Nia years. Both composite analyses and results from an atmospheric general circulation model show remarkable detail in terms of La Nia's impacts on mei-yu rainfall in the late 1970s due to the change in the mean climatic state over the tropical Pacific. After the late 1970s, the tropical Pacific SSTs were warmer, and the mean state of low-level anticyclone circulation over the western North Pacific (WNP) weakened. Superimposed on La Nia-related cyclonic anomaly over the WNP, anticyclonic circulation weakened. Prior to the late 1970s, the mean state of low-level anticyclone circulation over the WNP was stronger and was less affected by La Nia-related anomalous cyclones. Anticyclone circulation may have brought moisture to the Yangtze River valley, leading to above-normal rainfall.
部门归属[Wang Xin; Zhou Wen] City Univ Hong Kong, Sch Energy & Environm, Guy Carpenter Asia Pacific Climate Impact Ctr, Hong Kong, Hong Kong, Peoples R China; [Wang Dongxiao] S China Sea Inst Oceanol, Key Lab Trop Marine Environm Dynam, Guangzhou 510301, Guangdong, Peoples R China; [Li Chongyin] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China
关键词Mei-yu Decadal Modulation La Nina
学科领域Meteorology & Atmospheric Sciences
语种英语
资助项目LTO
WOS记录号WOS:000298387000014
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10285
专题热带海洋环境国家重点实验室(LTO)
通讯作者wenzhou@cityu.edu.hk
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Wang, X,Wang, DX,Zhou, W,et al. Interdecadal modulation of the influence of La Nina events on mei-yu rainfall over the Yangtze River valley[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2012,29(1):157-168.
APA Wang, X,Wang, DX,Zhou, W,Li, CY,&wenzhou@cityu.edu.hk.(2012).Interdecadal modulation of the influence of La Nina events on mei-yu rainfall over the Yangtze River valley.ADVANCES IN ATMOSPHERIC SCIENCES,29(1),157-168.
MLA Wang, X,et al."Interdecadal modulation of the influence of La Nina events on mei-yu rainfall over the Yangtze River valley".ADVANCES IN ATMOSPHERIC SCIENCES 29.1(2012):157-168.
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