Interdecadal modulation of the influence of La Nina events on mei-yu rainfall over the Yangtze River valley

被引:45
作者
Wang Xin [1 ]
Wang Dongxiao [2 ]
Zhou Wen [1 ]
Li Chongyin [3 ]
机构
[1] City Univ Hong Kong, Sch Energy & Environm, Guy Carpenter Asia Pacific Climate Impact Ctr, Hong Kong, Hong Kong, Peoples R China
[2] S China Sea Inst Oceanol, Key Lab Trop Marine Environm Dynam, Guangzhou 510301, Guangdong, Peoples R China
[3] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China
基金
中国国家自然科学基金;
关键词
mei-yu; decadal modulation; La Nina; ASIAN SUMMER MONSOON; WESTERN NORTH PACIFIC; GENERAL-CIRCULATION MODELS; SEA-SURFACE TEMPERATURE; 500 HPA HEIGHT; INDIAN-OCEAN; EAST-ASIA; EL-NINO; SOUTH CHINA; WINTER MONSOON;
D O I
10.1007/s00376-011-1021-8
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
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.
引用
收藏
页码:157 / 168
页数:12
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