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《Chinese Journal of Atmospheric Sciences》 2008-05
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Variability of Tropical Indian Ocean Atmosphere during Tropical Indian Ocean Dipole Mode Event—The Analysis of the Stream Function and the Potential Velocity of the Wind Field

LIU Lin,YU Weidong,DIAO Xinyuan,and GUO Jingsong1 First Institute of Oceanography,State Oceanic Administration,Qingdao 2660612 Key Laboratory of Marine Science and Numerical Modeling,State Oceanic Administration,Qingdao 266061  
The atmosphere circulation variability is one of the fundamental problems in the researches on the tropical Indian Ocean Dipole(IOD) mode event.The authors analyze the variability of the wind vorticity field and divergence field during IOD event based on the observation and the numerical model.The result indicates that both the divergent and rotational parts of the wind field present the first order baroclinic pattern in the vertical direction and symmetric pattern in the horizontal direction respectively.In the lower atmosphere,the rotational part shows a pair of symmetric anticyclones around the equator during the positive phase of IOD event and the divergent part shows the divergence in the eastern Indian Ocean and the convergence in the western Indian Ocean.Both the divergent part and the rotational part could generate zonal easterly wind above the equator region in the tropical Indian Ocean,which supports the air-sea positive feedback mechanism.The upper circulation is just reversed with the lower one.
【Fund】: 国家自然科学基金资助项目40506012、40706014;; 国家重点基础研究发展规划项目2006CB403602;; 基本科研业务费专项资金项目2007B04
【CateGory Index】: P732
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