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← GeographyWhich outcome occurs when coastal upwelling weakens during ENSO?
A)Nutrient availability declines, causing reduced productivity✓
B)Deep ocean salinity significantly decreases near shore
C)Coastal erosion lessens despite wave strength
D)Thermocline depth fluctuations become entirely negligible
💡 Explanation
Reduced upwelling sharply limits nutrient transport to surface waters because nutrient cycling depends on wind-driven replacement. Therefore, primary productivity falls dramatically near the coast, rather than deep-water salinity changes, erosion lessening, or halted thermocline dynamics dominating.
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