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← GeographyWhich 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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