• Adv. Atmos. Sci.  2017, Vol. 34 Issue (11): 1358-1379    DOI: 10.1007/s00376-017-6339-4
    Influence of the Preceding Austral Summer Southern Hemisphere Annular Mode on the Amplitude of ENSO Decay
    Fei ZHENG1(), Jianping LI2, 3, Ruiqiang DING1, 4
    1State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
    2College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
    3Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
    4Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610103, China
    Abstract
    Abstract  

    There is increasing evidence of the possible role of extratropical forcing in the evolution of ENSO. The Southern Hemisphere Annular Mode (SAM) is the dominant mode of atmospheric circulation in the Southern Hemisphere extratropics. This study shows that the austral summer (December-January-February; DJF) SAM may also influence the amplitude of ENSO decay during austral autumn (March-April-May; MAM). The mechanisms associated with this SAM-ENSO relationship can be briefly summarized as follows: The SAM is positively (negatively) correlated with SST in the Southern Hemisphere middle (high) latitudes. This dipole-like SST anomaly pattern is referred to as the Southern Ocean Dipole (SOD). The DJF SOD, caused by the DJF SAM, could persist until MAM and then influence atmospheric circulation, including trade winds, over the Niño3.4 area. Anomalous trade winds and SST anomalies over the Niño3.4 area related to the DJF SAM are further developed through the Bjerkness feedback, which eventually results in a cooling (warming) over the Niño3.4 area followed by the positive (negative) DJF SAM.

    Keywords Southern Hemisphere Annular Mode      ENSO      Southern Ocean Dipole     
    Just Accepted Date: 07 August 2017   Issue Date: 24 September 2017
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    Fei ZHENG
    Jianping LI
    Ruiqiang DING
    Cite this article:   
    Fei ZHENG,Jianping LI,Ruiqiang DING. Influence of the Preceding Austral Summer Southern Hemisphere Annular Mode on the Amplitude of ENSO Decay[J]. Adv. Atmos. Sci., 2017, 34(11): 1358 -1379 .
    URL:  
    http://159.226.119.58/aas/EN/10.1007/s00376-017-6339-4     OR     
    http://159.226.119.58/aas/EN/Y2017/V34/I11/1358
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