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← GeographyWhich outcome results from increased vertical stratification within an ocean gyre?
A)Reduced nutrient upwelling into the photic zone✓
B)Increased phytoplankton bloom intensity
C)Enhanced carbon sequestration in deep water
D)Weakened surface current velocity
💡 Explanation
When increased stratification occurs, nutrient transport from deeper waters diminishes because density differences hinder vertical mixing, reducing upwelling into the photic zone. Therefore reduced nutrient upwelling results, rather than increased blooms, sequestration, or current weakening, which depend on different mixing dynamics.
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