Which phenomenon disrupts coastal upwelling when intensified ocean gyre circulation creates strong downward Ekman transport?

💡 Explanation

When gyre circulation intensifies, Ekman transport moves surface water downward, suppressing upwelling because the vertical movement of nutrient-rich deep water is inhibited. Therefore, reduced nutrient availability results, rather than coastal erosion, oxygen minimum zone, or temperature changes—which are influenced by other processes.

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