Which phenomenon causes localized regions of downwelling within subtropical gyres in the ocean?

💡 Explanation

When surface waters converge within a gyre due to Ekman transport, caused by wind and the Coriolis effect, it forces water downwards, establishing a region of downwelling. Therefore Ekman transport convergence results, rather than coastal upwelling, plate subduction or atmospheric river influences, which operate via divergent mechanisms.

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• Which mechanism contributes when variations occur with the Walker circulation's wind patterns in the tropical Pacific region?
• Which mechanism creates an accretionary wedge when an oceanic plate subducts beneath a continental plate?
• Which effect increases phytoplankton concentration when coastal upwelling occurs?
• Which risk rises significantly when valley-confined lava flows develop levees?
• Which primary risk increases when an artificial levee is subjected to prolonged saturation during a major flood event?