Which process sustains unusually high productivity along western margins of a continental gyre where upwelling occurs?

💡 Explanation

When alongshore winds blow, Ekman transport occurs because Coriolis force deflects surface water offshore, causing upwelling of nutrient-rich deeper waters along western continental margins. Therefore Ekman transport sustains high productivity, rather than stratification, fertilization, or radiation which have smaller impact on specifically gyre-related upwelling.

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