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← GeographyWhich outcome occurs when deep ocean upwelling weakens during El Niño?
A)Thermocline depth temporarily shallows significantly
B)Productivity decline expands toward coastlines✓
C)Coastal fog formation sharply intensifies
D)Major coastal erosion shifts southward
💡 Explanation
Coastal productivity decreases because of reduced nutrient supply via upwelling; this suppression is due to decreased trade winds and thermocline changes during El Niño slowing nutrient transport; therefore ecosystem productivity plummets close to shore, rather than offshore because the current change impacts coastal regions directly.
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