| 斯里兰卡南部西向沿岸流在西南季风期间的动力学研究 |
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| 引用本文： | C. H. WICKRAMAGE,王卫强.斯里兰卡南部西向沿岸流在西南季风期间的动力学研究[J].南京气象学院学报,2018,10(3):290-298. |
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| 作者姓名： | C. H. WICKRAMAGE 王卫强 |
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| 作者单位： | 中国科学院南海海洋研究所 热带海洋环境国家重点实验室, 广州, 510301;中国科学院大学, 北京, 100049,中国科学院南海海洋研究所 热带海洋环境国家重点实验室, 广州, 510301;中国科学院大学, 北京, 100049 |
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| 基金项目： | 中国科学院国际合作局对外合作重点项目（131551KYSB20160002）；中国科学院战略性先导科技专项（XDA20060502）；国家自然科学基金（41776023，41676013）；热带海洋环境国家重点实验室（中国科学院南海海洋研究所）自主研究项目（LTOZZ1702） |
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| 摘 要： | 北半球夏季，北印度洋环流主要受到西南季风流控制，将热带印度洋水体从西向东进行跨海盆输运，然而在斯里兰卡南部沿岸存在一支与西南季风流方向相反的西向沿岸流，即南斯里兰卡沿岸流（SSLCC）.本文主要利用ECCO2资料进行南斯里兰卡沿岸流的动力学特征研究.结果表明，SSLCC的形成和孟加拉湾局地环流密切相关.当斯里兰卡穹顶区（SLD）环流偏强时，斯里兰卡南部形成局地气旋式涡旋，斯里兰卡东部沿岸流在SLD西部向南流动，随着气旋式涡旋北部转向西流形成强的SSLCC.相比之下，SLD较弱时，沿岸流仅存在斯里兰卡东部沿岸，斯里兰卡东部沿岸流无法向西转向，SSLCC和西南季风流一起向东流动，其可能的主要原因是局地风应力对SLD产生的强度影响.研究还表明，SLD强度对SSLCC流向和强度有着重要影响.
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| 关 键 词： | 孟加拉湾 西南季风流 斯里兰卡 沿岸流 斯里兰卡穹顶区 |
| 收稿时间： | 2018/6/10 0:00:00 |
Dynamics of westward coastal current during the southwest monsoon in southern Sri Lanka |
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| C. H. WICKRAMAGE and WANG Weiqiang.Dynamics of westward coastal current during the southwest monsoon in southern Sri Lanka[J].Journal of Nanjing Institute of Meteorology,2018,10(3):290-298. |
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| Authors: | C H WICKRAMAGE and WANG Weiqiang |
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| Institution: | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301;University of Chinese Academy of Sciences, Beijing 100049 and State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301;University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | During summertime,the north Indian Ocean circulation is characterized by eastward Southwest Monsoon Current (SMC) which is essential to the transport of water mass in the west and east ocean basins in the tropics.Occasionally,a narrow westward coastal current (hereafter referred to South Sri Lanka Coastal Current,SSLCC),against Southwest Monsoon (SWM) and SMC,exists off the southern coast of Sri Lanka at the same time.In this study,ECCO data is used to examine the dynamics and inter-annual variations of the narrow westward coastal current.It is found that the formation of the westward SSLCC is closely related to local circulation in the Bay of Bengal (BOB).The southward moving East Sri Lanka Coastal Current (ESLCC) which is associated with the western flank of Sri Lankan Dome (SLD) turns to westward along the northern flank of Small Cyclonic Vortex (SCV).The SCV is a cold upwelling dome,originated at the south of Sri Lanka.The strong SLD is the key factor to intensify the SCV which favors the westward SSLCC.This phenomenon is observed in the years of 1993,2002,2004 and 2011.However,the ESLCC turns to eastward with the SMC during the years which have weaker SLD,such as 1994,1997,2003 and 2008.The possible reason is that the SLD is unable to intensify the SCV.The analysis suggests that the strength of SLD plays a significant role for westward SSLCC. |
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| Keywords: | Bay of Bengal southwest monsoon current Sri Lanka coastal current Sri Lanka Dome |
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