Which phenomenon causes enhanced primary productivity following coastal upwelling events?

💡 Explanation

When upwelling occurs, deeper, colder water rises to the surface because wind-driven currents move surface water away, bringing nutrient-rich water to the euphotic zone that fuels phytoplankton growth. Therefore replenishment of surface nutrients results in higher primary productivity, rather than salinity, temperature, or turbidity effects which have minimal immediate impact.

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• Which mechanism causes increased marine productivity when coastal upwelling occurs?
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