| 2013年赤道波动调制下的东印度洋春季Wyrtki急流季节内变化研究 |
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| 引用本文： | 段永亮,刘洪伟,刘琳,于卫东.2013年赤道波动调制下的东印度洋春季Wyrtki急流季节内变化研究[J].海洋学报(英文版),2020,39(7):11-18. |
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| 作者姓名： | 段永亮 刘洪伟 刘琳 于卫东 |
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| 作者单位： | 自然资源部第一海洋研究所 海洋与气候研究中心, 青岛, 266061;青岛海洋科学与技术国家实验室 区域海洋动力学与数值模拟功能实验室, 青岛, 266061;中国科学院海洋研究所 海洋环流与波动重点实验室, 青岛, 266071;青岛海洋科学与技术国家实验室 海洋动力过程与气候功能实验室, 青岛, 266071;中国科学院海洋大数据中心, 青岛, 266071;中山大学 大气科学学院, 珠海, 519082;Key Laboratory of Tropical Atmosphere-Ocean System (Sun Yat-Sen University), Ministry of Education, Zhuhai 519082, China;Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China |
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| 基金项目： | The Basic Scientific Fund for National Public Research Institutes of China under contract Nos 2019Q03 and 2017S02; the National Natural Science Foundation of China under contract Nos 41706032, 41406012, 4187060841, 41876028 and 41676020; Taishan Scholars Programs of Shandong Province under contract No. tsqn201909165; the National Program on Global Change and Air-Sea Interaction under contract Nos GASI-IPOVAI-03, GASI-IPOVAI-02, GASI-02-IND-STSaut and GASI-02-IND-STSwin; the NSFC-Shandong Joint Fund for Marine Science Research Centers under contract No. U1606405; the Ao-Shan Talents Cultivation Program supported by Pilot National Laboratory for Marine Science and Technology (Qingdao) under contract No. 2017ASTCP-OS01. |
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| 摘 要： | A strong spring Wyrtki jet(WJ) presents in May 2013 in the eastern equatorial Indian Ocean. The entire buildup and retreat processes of the spring WJ were well captured by two adjacent Acoustic Doppler Current Profilers mounted on the mooring systems. The observed zonal jet behaved as one intraseasonal event with the significant features of abrupt emergence as well as slow disappearance. Further research illustrate that the pronounced surface westerly wind burst during late-April to mid-May, associated with the active phase of a robust eastwardpropagating Madden–Julian oscillation in the tropical Indian Ocean, was the dominant reason for the rapid acceleration of surface WJ. In contrasting, the governing mechanism for the jet termination was equatorial wave dynamics rather than wind forcing. The decomposition analysis of equatorial waves and the corresponding changes in the ocean thermocline demonstrated that strong WJ was produced rapidly by the wind-generated oceanic downwelling equatorial Kelvin wave and was terminated subsequently by the westward-propagating equatorial Rossby wave reflecting from eastern boundaries of the Indian Ocean.
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| 关 键 词： | Wyrtki急流 赤道波动动力学 热带季节内振荡 热带印度洋 |
| 收稿时间： | 2020/1/8 0:00:00 |
Intraseasonal modulation of Wyrtki jet in the eastern Indian Ocean by equatorial waves during spring 2013 |
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| Duan Yongliang,Liu Hongwei,Liu Lin,Yu Weidong.Intraseasonal modulation of Wyrtki jet in the eastern Indian Ocean by equatorial waves during spring 2013[J].Acta Oceanologica Sinica,2020,39(7):11-18. |
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| Authors: | Duan Yongliang Liu Hongwei Liu Lin Yu Weidong |
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| Institution: | Center for Ocean and Climate Research, First Institute of Oceanography, Ministry of Natural Resources, Qingdao266061, China;Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China;Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Ocean and Climate Dynamics, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai Campus, Zhuhai 519082, China;Key Laboratory of Tropical Atmosphere-Ocean System (Sun Yat-Sen University), Ministry of Education, Zhuhai 519082, China;Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China |
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| Abstract: | A strong spring Wyrtki jet (WJ) presents in May 2013 in the eastern equatorial Indian Ocean. The entire buildup and retreat processes of the spring WJ were well captured by two adjacent Acoustic Doppler Current Profilers mounted on the mooring systems. The observed zonal jet behaved as one intraseasonal event with the significant features of abrupt emergence as well as slow disappearance. Further research illustrate that the pronounced surface westerly wind burst during late-April to mid-May, associated with the active phase of a robust eastward-propagating Madden-Julian oscillation in the tropical Indian Ocean, was the dominant reason for the rapid acceleration of surface WJ. In contrasting, the governing mechanism for the jet termination was equatorial wave dynamics rather than wind forcing. The decomposition analysis of equatorial waves and the corresponding changes in the ocean thermocline demonstrated that strong WJ was produced rapidly by the wind-generated oceanic downwelling equatorial Kelvin wave and was terminated subsequently by the westward-propagating equatorial Rossby wave reflecting from eastern boundaries of the Indian Ocean. |
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| Keywords: | Wyrtki jet equatorial wave dynamics Madden-Julian oscillation tropical Indian Ocean |
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