ENSO-induced interannual variability in the southeastern South China Sea
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In this study, El Niño Southern Oscillation (ENSO)-induced interannual variability in the South China Sea (SCS) is documented using outputs from an eddy-resolving data-assimilating model. It is suggested that during an El Niño (La Niña) event, off-equatorial upwelling (downwelling) Rossby waves induced by Pacific equatorial wind anomalies impinge on the Philippine Islands and excite upwelling (downwelling) coastal Kelvin waves that propagate northward along the west coast of the Philippines after entering the SCS through the Mindoro Strait. The coastal Kelvin waves may then induce negative (positive) sea level anomalies in the southeastern SCS and larger (smaller) volume transport through the Mindoro and Luzon Straits during an El Niño (La Niña) event.
KeywordsENSO Coastal Kelvin waves Mindoro Strait Luzon Strait Bluelink model
This research was funded by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. kZCX2-YW-214, KZCX2-YW-Q11-02) and the National Natural Science Foundation of China (Grant No. 40806005, 40520140074). This work was also partially supported by a grant from the South China Sea Institute of Oceanology, Chinese Academy of Sciences (Project number SQ200814). This research is partly supported by CSIRO Wealth from Ocean Flagship, CSIRO Julius Award, and Western Australia Marine Science Institute. We would like to thank two anonymous reviewers for constructive comments.
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