| Duan Yongliang,Liu Hongwei,Liu Lin,Yu Weidong. 2020. Intraseasonal modulation of Wyrtki jet in the eastern Indian Ocean by equatorial waves during spring 2013. Acta Oceanologica Sinica, 39(7):11－18 |
| Intraseasonal modulation of Wyrtki jet in the eastern Indian Ocean by equatorial waves during spring 2013 |
| 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 |
| Received:January 08, 2020 |
| DOI：10.1007/s13131-020-1576-2 |
| Key words:Wyrtki jet equatorial wave dynamics Madden-Julian oscillation tropical Indian Ocean |
| 中文关键词: Wyrtki急流 赤道波动动力学 热带季节内振荡 热带印度洋 |
| 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. |
| Author Name | Affiliation | E-mail | | Duan Yongliang | Center for Ocean and Climate Research, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China | | | Liu Hongwei | 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 | | | Liu Lin | Center for Ocean and Climate Research, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China | liul@fio.org.cn | | Yu Weidong | 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. |
| 中文摘要: |
| 2013年5月在赤道东印度洋出现了一次强劲的Wyrtki急流现象，急流的建立与衰退过程被两个相邻的锚系ADCP完整地捕捉观测到了。观测的急流呈现出一次快速生成、缓慢消失的典型季节内时间尺度过程。研究结果表明，对应于一次强劲热带季节内振荡正位相的东向传播过程，热带印度洋海表风场在4月底到五月中旬出现了显著的西风爆发现象，从而驱动了表层Wyrtki急流的快速生成。而随后的急流衰退、终结则是由赤道波动动力过程控制，而非风场驱动。赤道波动分解结果与对应的海洋上层温跃层变化也证明了强劲的春季Wyrtki急流现象是受西风爆发引起的赤道海洋下沉Kelvin波的驱动快速生成，随后被印度洋东边界反射的西向传播Rossby波所抵消终结。 |
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