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← GeographyWhich climatic consequence occurs when a major volcanic eruption disrupts the North Atlantic subpolar gyre?
A)Weakened Atlantic Meridional Overturning Circulation✓
B)Increased frequency of tropical cyclones
C)Enhanced carbon sequestration by phytoplankton
D)Accelerated melting of Arctic sea ice
💡 Explanation
When a volcanic eruption injects aerosols into the stratosphere, reduced solar radiation cools the North Atlantic, slowing down the subpolar gyre which drives the Atlantic Meridional Overturning Circulation (AMOC). Therefore weakened AMOC results, rather than increased cyclone frequency, enhanced carbon sequestration, or accelerated ice melt, which depend on different environmental conditions and feedback mechanisms.
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