Cite this paper:
Kangping DENG, Xuhua CHENG, Tao FENG, Tian MA, Wei DUAN, Jiajia CHEN. Interannual variability of the spring Wyrtki Jet[J]. Journal of Oceanology and Limnology, 2021, 39(1): 26-44

Interannual variability of the spring Wyrtki Jet

Kangping DENG1, Xuhua CHENG1,2,3, Tao FENG1, Tian MA1, Wei DUAN1, Jiajia CHEN1
1 Hohai University, Nanjing 210098, China;
2 Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China;
3 Key Laboratory of Coastal Disaster and Defense (Hohai University), Ministry of Education, Nanjing 210098, China
Features of the interannual variability of the spring Wyrtki Jet in the tropical Indian Ocean are revealed using observation data and model output. The results show that the jet has significant interannual variation, which has a significant correlation with winter El Niño Modoki index (R=0.62). During spring after an El Niño (La Niña) Modoki event, the Wyrtki Jet has a positive (negative) anomaly, forced by a westerly (easterly) wind anomaly. The result of a linear-continuously stratified model shows that the first two baroclinic modes explain most of the interannual variability of the spring Wyrtki Jet (~70%) and the third to fifth modes together account for approximately 30%. Surface wind anomalies in the tropical Indian Ocean are related to the Walker circulation anomaly associated with El Niño/La Niña Modoki. The interannual variability of the spring Wyrtki Jet has an evident impact on sea surface salinity transport before the onset phase of the summer monsoon in the Indian Ocean.
Key words:    Equatorial Indian Ocean|Wyrtki Jet|interannual variability|El Ni�o/La Ni�a Modoki   
Received: 2019-12-24   Revised: 2020-02-04
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Articles by Kangping DENG
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