Which effect promotes plankton blooms when coastal upwelling transports deep water towards the surface?

💡 Explanation

When upwelling occurs, deep water rises because of wind-driven surface currents pulling water away from the coast, leading to the replacement with cool, nutrient-rich water. Therefore, nutrient replenishment occurs, which directly supports increased primary productivity of plankton, rather than inhibiting processes such as stratification, reduced salinity, or oxygen depletion.

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