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← GeographyWhich risk increases when glacial melt accelerates Arctic halocline weakening?
A)Decreased North Atlantic carbon sequestration✓
B)Increased Antarctic sea ice formation
C)Strengthened equatorial ocean upwelling
D)Enhanced global deepwater formation rate
💡 Explanation
A weakened halocline reduces density stratification; this disrupts Thermohaline Circulation, leading to less North Atlantic overturning. Therefore, carbon sequestration decreases rather than increases, because less surface water subducts, lowering CO2 absorption.
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