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Understanding Interannual Variations of the Local Rainy Season over the southwest indian ocean

Advances in Atmospheric Sciences 2021年第11期38卷 1852-1862页

作者： Hanying LI Peng HU Qiong ZHANG Ashish SINHA Hai CHENG Institute of Global Environmental Change Xi'an Jiaotong UniversityXi'an 710054China Center for Monsoon ystem Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100190China Department of Physical Geography and Bolin Centre for Climate Research Stockholm UniversityStockholm SE 10691Sweden Department of Earth Science California State UniversityDominguez HillsCarson CA 90747USA Department of Earth Sciences University of MinnesotaMinneapolis MN 55455USA

Located at the southern boundary of the tropical rainfall belt within the South Africa monsoon regime,Rodrigues Island,~2500 km east of East Africa,is ideally located to investigate climatic changes over the southwest indian ocean(SWIO).In this study,we investigate the climatic controls of its modern interannual rainfall variability in terms of teleconnection and local *** find that increased rainfall over the SWIO tends to occur in association with anomalously warm(cold)SSTs over the equatorial central Pacific(Maritime Continent),resembling the central Pacific El Niño,closely linked with the Victoria mode in the North *** analyses show that the low-level convergence induced by warm SST over the equatorial central Pacific leads to anomalous low-level divergence over the Maritime Continent and convergence over a large area surrounding the Rodrigues Island,which leads to increased rainfall over the SWIO during the rainy ***,the excited Rossby wave along the tropical indian ocean transports more water vapor from the tropical convergence zone into the SWIO via intensified northwest ***,positive feedback induced by the Rossby wave response to the increased rainfall in the region contributes to the large interannual variations over the SWIO.

关键词： southwest indian ocean interannual rainfall variability Pacific Walker Circulation Rossby wave positive feedback

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Interactions between hotspots and the southwest indian Ridge during the last 90 Ma:Implications on the formation of oceanic plateaus and intra-plate seamounts

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Science China Earth Sciences 2011年第8期54卷 1177-1188页

作者： ZHANG Tao 1,2,3,4,LIN Jian 5 & GAO JinYao 3,4 1 Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3 The Second Institute of oceanography,State oceanic Administrator,Hangzhou 310012,China 4 Key Laboratory of Submarine Geosciences,State oceanic Administrator,Hangzhou 310012,China 5 Department of Geology and Geophysics,Woods Hole oceanographic Institution,Woods Hole,MA 02543,USA 1. Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. The Second Institute of Oceanography State Oceanic Administrator Hangzhou 310012 China4. Key Laboratory of Submarine Geosciences State Oceanic Administrator Hangzhou 310012 China

This study investigates the relationship between the hotspot-ridge interaction and the formation of oceanic plateaus and seamounts in the southwest indian *** first calculated the relative distance between the southwest indian Ridge (SWIR) and relevant hotspots on the basis of models of plate reconstruction,and then calculated the corresponding excess magmatic anomalies of the hotspots on the basis of residual bathymetry and Airy *** results reveal that the activities of the Marion hotspot can be divided into three main phases:interaction with the paleo-Rodrigues triple junction (73.6-68.5 Ma),interaction with the SWIR (68.5-42.7 Ma),and intra-plate volcanism (42.7-0 Ma).These three phases correspond to the formation of the eastern,central,and western parts of the Del Cano Rise,*** magnitude and apparent periodicity of the magmatic volume flux of the Marion hotspot appear to be dominated by the hotspot-ridge *** periodicity of the Marion hotspot is about 25 Ma,which is much longer than that of the Hawaii and Iceland hotspots (about 15 Ma).

关键词： southwest indian ocean hotspot-ridge interaction magmatic volume flux oceanic plateaus seamounts

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