Intraseasonal modulation of Wyrtki jet in the eastern Indian Ocean by equatorial waves during spring 2013

Yongliang Duan; Hongwei Liu; Lin Liu; Weidong Yu

doi:10.1007/s13131-020-1576-2

Volume 39 Issue 7

Jul. 2020

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Yongliang Duan, Hongwei Liu, Lin Liu, Weidong Yu. 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. doi: 10.1007/s13131-020-1576-2

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Yongliang Duan, Hongwei Liu, Lin Liu, Weidong Yu. 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. doi: 10.1007/s13131-020-1576-2

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Intraseasonal modulation of Wyrtki jet in the eastern Indian Ocean by equatorial waves during spring 2013

doi: 10.1007/s13131-020-1576-2

Yongliang Duan^{1, 2},
Hongwei Liu^{3, 4, 5},
Lin Liu^{1, 2
,
,},
Weidong Yu^{6, 7, 8}

1.
Center for Ocean and Climate Research, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
3.
Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
4.
Laboratory for Ocean and Climate Dynamics, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China
5.
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
6.
School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai Campus, Zhuhai 519082, China
7.
Key Laboratory of Tropical Atmosphere-Ocean System (Sun Yat-Sen University), Ministry of Education, Zhuhai 519082, China
8.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China

Funds: 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.

More Information

Corresponding author: E-mail: liul@fio.org.cn
Received Date: 2020-01-08
Accepted Date: 2020-02-04

Available Online: 2020-12-28

Publish Date: 2020-07-25

Abstract

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.
- Wyrtki jet,
- equatorial wave dynamics,
- Madden–Julian oscillation,
- tropical Indian Ocean

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References(72)

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