Ocean Science
Ocean Science
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Articles | Volume 22, issue 5
Articles | Volume 22, issue 5
https://doi.org/10.5194/os-22-3347-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-22-3347-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 5
Research article
 | 
21 Oct 2026
Research article |  | 21 Oct 2026

Contrasting physical drivers of chlorophyll a responses to summer marine heatwaves in the South China Sea

Yunlu Fang, Cong Liu, Yicheng Chen, Peiliang Li, and Mingyang Li

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Short summary
Marine heatwaves, periods of unusually warm ocean temperatures, are often linked to variations of chlorophyll-a, but ocean ecosystems are shaped by many processes. Using satellite and reanalysis data and causal analysis, we studied changes in the South China Sea. Chlorophyll-a decreased off Vietnam and increased near the Pearl River Estuary. The main drivers were weaker upward nutrient transport off Vietnam and stronger river-water retention near the estuary, not these warm events alone.
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