| What Determines the Amplitude of ENSO Events? |
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| 作者姓名： | WANG Yu-Xing YANG Hai-jun Tore FUREVIK |
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| 作者单位： | Department of Atmospheric and Oceanic Sciences, School of Physics ＆Laboratory for Climate and Ocean-Atmosphere Studies (LaCOAS) , Peking University, Beijing 100871, China;Department of Atmospheric and Oceanic Sciences, School of Physics ＆Laboratory for Climate and Ocean-Atmosphere Studies (LaCOAS) , Peking University, Beijing 100871, China;Geophysical Institute and Bjerknes Centre for Climate Research, University in Bergen, Bergen, Norway |
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| 基金项目： | This work is jointly supported by the National Natural Science Foundation of China，the Special Fund for Meteorological Scientific Research in the Public Interest of China Meteorological Administration，the Norwegian Research Council through the East Asian DecCen Project (Grant No.193690/S30).It contributes to the Centre for Climate Dynamics at the Bjerknes Centre |
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| 摘 要： | In this paper, the dynamic effect of oceanic upwelling on the intensity of El Nio-Southern Oscillation (ENSO) is studied using a simple coupled model (Zebiak-Cane Model). The term balance analysis in the temperature variability equation shows that the anomalous upwelling of the mean vertical temperature gradient and the mean advection of the anomalous meridional temperature gradient are the two of most important factors that determine the intensity of ENSO events, in which the "vertical oceanic heat flux" in the eastern equatorial Pacific (EEP) is the primary influencing factor. The lag correlation between "vertical heat flux (VHF)" and ENSO intensity shows that the highest correlation occurs when the former leads the latter by one to two weeks. The VHF is positively correlated with the background thermocline strength in the EEP, and an increase of both could result in strong ENSO variability. Comparison of the forced and coupled experiments suggests that the coupled process can affect both the intensity and frequency of ENSO.
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What Determines the Amplitude of ENSO Events? |
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| WANG Yu-Xing,YANG Hai-jun,Tore FUREVIK.What Determines the Amplitude of ENSO Events?[J].Atmospheric and Oceanic Science Letters,2013,6(2):90-96. |
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| Authors: | WANG Yu-Xing YANG Hai-Jun Tore FUREVIK |
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| Institution: | 1. Department of Atmospheric and Oceanic Sciences & Laboratory for Climate and Ocean-Atmosphere Studies(LaCOAS), School of Physics, Peking University, Beijing 100871, China
2. Geophysical Institute and Bjerknes Centre for Climate Research, University in Bergen, Bergen, Norway |
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| Abstract: | |
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| Keywords: | ENSO amplitude vertical heat flux thermocline strength |
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