Which outcome arises when weakened trade winds reduce upwelling off South America during an El Niño event?

💡 Explanation

When weakened trade winds occur, upwelling decreases off South America because the surface water isn't pushed offshore, thereby allowing the nutrient-rich water to reach the surface. Therefore a decline in fisheries productivity results owing to nutrient depletion, rather than fog intensification, temperature decreases, or increased erosion that are driven by cooler waters or higher wave energy, both conditions opposing El Nino.

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