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Why does upwelling occur off central Vietnam in early summer?

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Physical map of the East China Sea, South China Sea, and Yellow Sea, showing surrounding countries, major cities, and maritime boundaries. The map highlights sea depths with color shading, features such as the Macclesfield Bank and Philippine Trench, and includes a locator inset for regional context.
South China Sea

In early summer, upwelling occurs off the coast of central Vietnam due to the influence of monsoonal winds blowing from the southwest. These winds move surface water toward the northeast while simultaneously displacing it away from the coast. This displacement causes deeper, colder, and nutrient-rich water to rise to the surface, creating distinct upwelling areas.1