| 印度洋赤道潜流年际变化特征及其与印度洋偶极子的联系 |
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| 引用本文： | 李俊灵,徐康,王卫强,谢强.印度洋赤道潜流年际变化特征及其与印度洋偶极子的联系[J].海洋与湖沼,2022,53(1):19-32. |
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| 作者姓名： | 李俊灵 徐康 王卫强 谢强 |
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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 广东广州 510301;南方海洋科学与工程广东省实验室(广州) 广东广州 511458;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 广东广州 510301;南方海洋科学与工程广东省实验室(广州) 广东广州 511458;中国科学院南海生态环境工程创新研究院 广东广州 510301;中国科学院深海科学与工程研究所 海南三亚572000;青岛海洋科学与技术试点国家实验室区域海洋动力学与数值模拟功能实验室 山东青岛 266237;中国科学院海洋大科学研究中心 山东青岛 266071 |
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| 基金项目： | 中国科学院战略性先导科技专项,XDA20060502号;中国科学院青年创新促进会人才专项,2020340号;中国科学院南海海洋研究所南海新星项目,NHXX2018WL0201号;中国科学院重点部署项目,ZDRW-XH-2019-2号;中国科学院南海生态环境工程创新研究院自主部署项目,ISEE2021ZD01号;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,LTOZZ2101号;国家自然科学基金项目,42076020号,91958202号;南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项,GML2019ZD0306号。 |
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| 摘 要： | 印度洋赤道潜流(equatorial undercurrent,EUC)是赤道流系的重要组成部分,对印度洋物质输运和能量交换有着重要意义.基于SODA 3.4.2海洋再分析数据,对印度洋EUC的三维空间结构和年际变化特征进行分析,并揭示其年际变率与印度洋偶极子(Indian Ocean dipole,IOD)的联系.结...
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| 关 键 词： | 印度洋赤道潜流 印度洋偶极子 年际变化 赤道纬向风异常 纬向压强梯度力 |
| 收稿时间： | 2021/6/15 0:00:00 |
| 修稿时间： | 2021/7/25 0:00:00 |
INTERANNUAL VARIABILITY OF INDIAN OCEAN EQUATORIAL UNDERCURRENT AND ITS LINK TO THE INDIAN OCEAN DIPOLE |
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| LI Jun-Ling,XU Kang,WANG Wei-Qiang,XIE Qiang.INTERANNUAL VARIABILITY OF INDIAN OCEAN EQUATORIAL UNDERCURRENT AND ITS LINK TO THE INDIAN OCEAN DIPOLE[J].Oceanologia Et Limnologia Sinica,2022,53(1):19-32. |
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| Authors: | LI Jun-Ling XU Kang WANG Wei-Qiang XIE Qiang |
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| Institution: | (State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;University of Chinese Academy of Sciences,Beijing 100049,China;Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,Guangzhou 510301,China;Institute of Deep-sea Science and Engineering,Chinese Academy of Sciences,Sanya 572000,China;Laboratory for Regional Oceanography and Numerical Modeling,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China) |
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| Abstract: | The Indian Ocean equatorial undercurrent(EUC) is an important part of the equatorial current system and plays a vital role in Indian Ocean mass transport and heat exchange. Based on the SODA 3.4.2 ocean reanalysis data, we studied the three-dimensional spatial structure of the EUC in the Indian Ocean and its interannual variability, and the relationship between the EUC and Indian Ocean dipole(IOD) on the interannual timescale. Results show that the climatological Indian Ocean EUC usually appears in late winter and early spring from February to April and late summer and early autumn from August to October, and displays a symmetric zonal current anomaly distribution over the equator.Semiannual variation of the EUC is primarily attributed to the eastward subsurface zonal pressure gradient force(PGF) that is driven by the equatorial easterly wind. On the interannual scale, the structure and intensity of the EUC in the Indian Ocean is significantly regulated by the IOD. During the positive IOD developing years, the Indian Ocean EUC occurs almost a whole year, and its intensity increases in spring and weakens in summer. The EUC finally reaches the peak amplitude, and its core is slightly moved southward to the equator during the mature of positive IOD. Dynamic diagnosis reveals that, the eastward subsurface PGF in the equatorial central Indian Ocean dominates the interannual variability of the Indian Ocean EUC and is an important proxy of the interannual variation of the EUC. Therefore, IOD mainly affects the Indian Ocean subsurface PGF via the positive feedback mechanism of the wind-thermocline-sea surface temperature anomalies, and further modulates the interannual variation of EUC. Meanwhile, the enhanced EUC can compensate the upwelling in the equatorial eastern Indian Ocean and further maintain the IOD. |
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| Keywords: | Indian Ocean equatorial undercurrent Indian Ocean dipole interannual variability equatorial zonal wind anomalies zonal pressure gradient force |
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