A study of correlation between Pacific Decadal Oscillation and El Niño-Southern Oscillation and the strength of Kuroshio intrusion into the South China Sea

Yang Longqi; Xu Dongfeng; Xu Mingquan; Sui Dandan; Wu Pinhuang

doi:10.3969/j.issn.0253-4193.2014.07.003

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Yang Longqi, Xu Dongfeng, Xu Mingquan, Sui Dandan, Wu Pinhuang. A study of correlation between Pacific Decadal Oscillation and El Niño-Southern Oscillation and the strength of Kuroshio intrusion into the South China Sea[J]. Haiyang Xuebao, 2014, 36(7): 17-26. doi: 10.3969/j.issn.0253-4193.2014.07.003

Citation:

Yang Longqi, Xu Dongfeng, Xu Mingquan, Sui Dandan, Wu Pinhuang. A study of correlation between Pacific Decadal Oscillation and El Niño-Southern Oscillation and the strength of Kuroshio intrusion into the South China Sea[J]. Haiyang Xuebao, 2014, 36(7): 17-26. doi: 10.3969/j.issn.0253-4193.2014.07.003

Citation:

Yang Longqi, Xu Dongfeng, Xu Mingquan, Sui Dandan, Wu Pinhuang. A study of correlation between Pacific Decadal Oscillation and El Niño-Southern Oscillation and the strength of Kuroshio intrusion into the South China Sea[J]. Haiyang Xuebao, 2014, 36(7): 17-26. doi: 10.3969/j.issn.0253-4193.2014.07.003

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A study of correlation between Pacific Decadal Oscillation and El Niño-Southern Oscillation and the strength of Kuroshio intrusion into the South China Sea

doi: 10.3969/j.issn.0253-4193.2014.07.003

1.
Sate Key Laboratory of Satellite Ocean Environment Dynamic, The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Fuzhou Ocean and Fisheries Technology Center, Fuzhou 350026, China
2.
Sate Key Laboratory of Satellite Ocean Environment Dynamic, The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
4.
Fuzhou Ocean and Fisheries Technology Center, Fuzhou 350026, China

Received Date: 2013-12-01
Rev Recd Date: 2014-03-07

Abstract

Abstract

There is a controversy about the role of Pacific Decadal Oscillation (PDO) and El Niño-Southern Oscillation (ENSO) in the Kuroshio intrusion into the South China Sea. In this study, we firstly analyzed the correlation of the subsurface high salinity water in the 120°E section and the North Equatorial Current Bifurcation(NEC-Y). Secondly, we analyzed the relation of Kuroshio intrusion index(KI index), North Equatorial Current index(NEC index)and the North Equatorial Current Bifurcation. Finally, we analyzed the pertinence of PDO index, Niño 3.4 index and the North Equatorial Current bifurcation by methods of EMD and correlation coefficient and analyzed the mechanism by NECP wind data. The result shows: (1) the NEC-Y has a well correlation with subsurface high salinity water in the 120°E section, the KI index and the NEC index. So the NEC-Y can been a good index of the strength of Kuroshio intrusion into the South China Sea; (2) there is a well 0.5 level of correlation coefficients between NEC-Y and the PDO index, the Niño 3.4 index. These well correlated coefficients show that both PDO and ENSO have important effect on the strength of Kuroshio intrusion into the South China Sea; (3) in El Niño (La Niña) year, a western (eastern) anomalous wind of the tropical Pacific causes a northward (southward) shift of the North Equatorial Current Bifurcation Latitude. This results in a weakened (enhanced) Kuroshio off Luzon, favoring Kuroshio intrusion into the South China Sea..While PDO is in the warm (cold) phase, the western (easern) anomalous wind will be strenghened in tropical Pacific and this will cause a northward(southward) shift of the North Equatorial Current Bifurcation Latitude too. So, the strength of Kuroshio intrusion into the South China Sea will be enhanced (weakened).
- Kuroshio intrusion,
- North Equatorial Current Bifurcation,
- PDO,
- ENSO

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References(40)

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