Which mechanism intensifies coastal upwelling when alongshore winds align parallel to continental margins near a gyre’s eastern boundary?

💡 Explanation

When alongshore winds align with eastern boundary gyres, Ekman transport laterally deflects surface water offshore because of Coriolis effect, leading to upward movement of nutrient-rich bottom waters along the coast. Therefore, upwelling intensifies due to offshore surface flow, rather than other options involving pressure, geostrophy or thermohaline circulation.

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