Dynamical diagnostics of the SST annual cycle in the eastern equatorial Pacific: part I a linear coupled framework
Chen, YY; Jin, FF; jff@hawaii.edu
2018
发表期刊CLIMATE DYNAMICS
卷号50期号:2018-05-06页码:1841-1862
摘要The eastern equatorial Pacific has a pronounced westward propagating SST annual cycle resulting from ocean-atmosphere interactions with equatorial semiannual solar forcing and off-equatorial annual solar forcing conveyed to the equator. In this two-part paper, a simple linear coupled framework is proposed to quantify the internal dynamics and external forcing for a better understanding of the linear part of the dynamics annual cycle. It is shown that an essential internal dynamical factor is the SST damping rate which measures the coupled stability in a similar way as the Bjerknes instability index for the El Nio-Southern Oscillation. It comprises three major negative terms (dynamic damping due to the Ekman pumping feedback, mean circulation advection, and thermodynamic feedback) and two positive terms (thermocline feedback and zonal advection). Another dynamical factor is the westward-propagation speed that is mainly determined by the thermodynamic feedback, the Ekman pumping feedback, and the mean circulation. The external forcing is measured by the annual and semiannual forcing factors. These linear internal and external factors, which can be estimated from data, determine the amplitude of the annual cycle.
部门归属[Chen, Ying-Ying] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Chen, Ying-Ying] Univ Chinese Acad Sci, Beijing, Peoples R China; [Chen, Ying-Ying; Jin, Fei-Fei] Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Dept Atmospher Sci, Honolulu, HI 96822 USA; [Chen, Ying-Ying] Nanjing Univ Informat Sci & Technol, Nanjing, Jiangsu, Peoples R China
关键词Sst Annual Cycle Ocean-atmosphere Interaction Westward Propagation External Forcing
学科领域Meteorology & Atmospheric Sciences
资助项目LTO
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17092
专题热带海洋环境国家重点实验室(LTO)
通讯作者jff@hawaii.edu
推荐引用方式
GB/T 7714
Chen, YY,Jin, FF,jff@hawaii.edu. Dynamical diagnostics of the SST annual cycle in the eastern equatorial Pacific: part I a linear coupled framework[J]. CLIMATE DYNAMICS,2018,50(2018-05-06):1841-1862.
APA Chen, YY,Jin, FF,&jff@hawaii.edu.(2018).Dynamical diagnostics of the SST annual cycle in the eastern equatorial Pacific: part I a linear coupled framework.CLIMATE DYNAMICS,50(2018-05-06),1841-1862.
MLA Chen, YY,et al."Dynamical diagnostics of the SST annual cycle in the eastern equatorial Pacific: part I a linear coupled framework".CLIMATE DYNAMICS 50.2018-05-06(2018):1841-1862.
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