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Geography

Which thermocline change occurs when subtropical gyre intensification increases?

A)Mixed layer depth shallows
B)Enhanced deep-water formation occurs
C)Nutrient upwelling region expands
D)Surface salinity gradients decrease

💡 Explanation

Increased gyre intensification suppresses vertical mixing due to increased stratification; therefore, mixed-layer depth shallows because wind-driven mixing becomes less effective, rather than nutrient distribution, deep water alteration, or salinity being principally affected.

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