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← GeographyWhich perturbation arises during strong El Niño phases?
A)Global weather pattern alterations
B)Reduced coastal upwelling intensity✓
C)Increased ocean carbon sequestration
D)Amplified polar vortex destabilization
💡 Explanation
El Niño weakens Pacific trade winds; decreased wind stress inhibits upwelling because the Ekman transport of surface waters offshore diminishes, therefore productivity drops as nutrient-rich deep water ascent is suppressed, rather than enhanced carbon absorption by plankton.
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