The first two leading modes of the tropical Pacific and their linkage without global warming

Yang Li; QuanLiang Chen; XiaoRan Liu; Nan Xing; ZhiGang Cheng; HongKe Cai; Xin Zhou; Dong Chen; XiaoFei Wu; MingGang Li

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The first two leading modes of the tropical Pacific and their linkage without global warming

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A discrepancy remains in the first two leading empirical orthogonal function(EOF)modes of the tropical Pacific sea surface temperature anomaly(SSTA)based on observations since the 1980s.The EOF1 mode,representing the El Nino-Southern Oscillation(ENSO),is a robust result.However,the EOF2 features either El Nino Modoki(EM)or ENSO evolution during different periods,which is probably associated with the impacts of global warming.The underlying question is what the EOF2 mode of the tropical Pacific would be without global warming.Using the CMIP5 preindustrial scenario to exclude the influence of global warming,we find that the EOF1 mode of the tropical Pacific SSTA represents ENSO and that the EOF2 mode is not EM.According to the lead–lag correlation between the ENSO and EOF2 modes,the linkage between these two modes is as follows:…El Nino→EOF2→La Nina→–EOF2→El Nino….By analyzing the evolution of sea surface temperature,surface wind,and subsurface ocean temperature anomalies,we find the mechanism linking the ENSO and EOF2 modes is the air–sea interaction associated with the ENSO cycle.This result suggests that the EOF2 mode represents an aspect of ENSO evolution under preindustrial conditions.Therefore,this study further indicates that the EM is probably due to the influence of global warming.

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来源
《地球与行星物理:英文版》 |2019年第2期|P.157-165|共9页
作者
Yang Li; QuanLiang Chen; XiaoRan Liu; Nan Xing; ZhiGang Cheng; HongKe Cai; Xin Zhou; Dong Chen; XiaoFei Wu; MingGang Li;
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作者单位

College of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China;

College of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China;

State Chongqing Climate Center Chongqing 401147 China;

Beijing Meteorological Service Beijing 100875 China;

College of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China;

College of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China;

College of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China;

College of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China;

College of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China;

College of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China;

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原文格式 PDF
正文语种 chi
中图分类天文学、地球科学;
关键词
El Nino-Southern Oscillation(ENSO); ENSO evolution; global warming; air–sea interaction;

机译：厄尔尼诺-南方涛动;ENSO演化;全球变暖;海-海相互作用;

The first two leading modes of the tropical Pacific and their linkage without global warming

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