Ocean Science
Ocean Science
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Articles | Volume 21, issue 6
Articles | Volume 21, issue 6
https://doi.org/10.5194/os-21-3361-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-21-3361-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 6
Research article
 | 
10 Dec 2025
Research article |  | 10 Dec 2025

Interannual variability of summertime cross-isobath exchanges in the northern South China Sea: ENSO and riverine influences

Yunping Song, Yuxin Lin, Peng Zhan, Zhiqiang Liu, and Zhongya Cai

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Short summary
To study summer coastal current changes in the Northern South China Sea (NSCS), we analyzed 2000–2022 observations and simulations, focusing on El Niño–Southern Oscillation (ENSO) and Pearl River freshwater impacts. During El Niño, uneven sea levels between the central and southern South China Sea strengthened northward currents. The Pearl River’s freshwater plume extended farther east, reducing nearshore salinity. Our findings highlight how local and remote factors interact to shape NSCS circulation dynamics.
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