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← GeographyWhich impact does increased freshwater input from glacial melt have on North Atlantic gyre circulation?
A)Weakening of thermohaline density gradients✓
B)Strengthening of Coriolis force deflection
C)Increased nutrient upwelling along coastlines
D)Enhanced evaporation rates and salinity
💡 Explanation
When freshwater input increases, stratification occurs because the density differences with saltwater decrease, weakening the thermohaline circulation. Therefore, thermohaline density gradients weaken, rather than strengthening of Coriolis or evaporation, which require higher salinity; nutrient upwelling relates to wind forcing.
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