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← GeographyNear South America, which outcome accompanies El Niño's weakening thermocline?
A)Reduced coastal upwelling and nutrient supply✓
B)Increased productivity of surface phytoplankton
C)Strengthened trade winds circulation pattern
D)Intensified cooling via deep water intrusion
💡 Explanation
Weaker trade-winds drive downwelling, sinking warm water and reducing upwelling of cold, nutrient-rich waters due to oceanic subsidence. Therefore, nutrient supplies diminish along the coast, rather than increasing primary productivity under calmer conditions.
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