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Weaker connection between the atlantic Multidecadal Oscillation and Indian summer rainfall since the mid-1990s

Atmospheric and Oceanic Science Letters 2018年第1期11卷 37-43页

作者： LUO Fei-Fei LI Shuanglin Tore FUREVIK Nansen-Zhu International Research Centre and Climate Change Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Department of Atmospheric Science China University of Geosciences Wuhan China Geophysical Institute and Bjerknes Centre for Climate Research University of Bergen Bergen Norway

Previous studies have shown that the atlantic Multidecadal Oscillation （AMO） can play an important role in modulating the variabilityoflndian summer monsoon rainfall （ISMR） over a 50-60-yr timescale. A significant positive correlation between the AMO and ISMR is found both in observations and models. However, instrumental records show that the relationship becomes non-significant or even of opposite sign after the mid-1990s, suggesting a weakening of the AMO-ISMR connection. The mechanism for the breakdown of the AMO-ISMR connection is investigated in the present work, and the results suggest that a substantial warming in the Indian-tropical western Pacific Ocean plays a role. The warming weakens the meridional gradient of tropospheric temperature between Eurasia and the indian Ocean, and reduces the meridional sea level pressure gradient between the Indian Subcontinent and Indian Ocean, weakening the Indian summer monsoon. Thus, warming in the Indian-tropical western Pacific Ocean seems responsible for the weakened connection between the AMO and ISM.

关键词： atlantic multidecadaloscillation Indian summerrainfall connection multidecadal variation

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Modulation by the atlantic Multidecadal Oscillation of the intensity of the interannual seesaw between the Somali and Australian cross-equatorial flows

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Atmospheric and Oceanic Science Letters 2017年第4期10卷 306-311页

作者： LI Shuanglin CHEN Ying LI Chen College of Atmospheric Sciences Chengdu University of Information and Technology Climate Change Research Center and Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

The decadal variation of the intensity of the interannual opposite connection （seesaw） between the Somali and Australian cross-equatorial flows （CEFs） is investigated. During the period prior to the mid-1960s, and after the early-2000s, the intensity of the interannual seesaw connection is significantly weaker relative to the period between. Such interdecadal shifts in the interannual seesaw intensity bear a resemblance to the decadal shift in ENSO＇s strength, and can be further attributed to the phase transition of the atlantic Multidecadal Oscillation （AMO）. When the AMO is in a positive phase, the ENSO amplitude reduces and the seesaw strength becomes weakened, and vice *** historical simulation outputs of the CMIP5 models are used to verify the connection, and a similar result was obtained. Thus, the notion that the intensity of the interannual opposite connection （seesaw） between the CEFs is modulated by the AMO is robust.

关键词： Cross-equatorial flow ENSO atlantic multidecadaloscillation East Asiansummer rainfall

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