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Which outcome occurs because of increased runoff into subtropical gyres?

A)Enhanced coastal thermohaline salinity stratification
B)Diminished offshore biological pump efficiency
C)Increased deep ocean anoxic zone volume
D)Greater coastal upwelling nutrient availability

💡 Explanation

Enhanced runoff decreases density in surface layers forming strong haloclines, thereby increasing coastal thermohaline salinity stratification; this happens because freshwater input prevents vertical mixing from wind shear therefore hindering downward momentum of mixed layers rather than upwelling facilitation.

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