During strong El Niño phases, which mechanism increases nutrient stratification influencing marine ecosystems off Peru?

💡 Explanation

During strong El Niño events, trade winds weaken, suppressing the Humboldt Current upwelling because the thermocline deepens, reducing nutrient supply to surface waters and increasing stratification. Therefore weakened upwelling results, rather than increased erosion or enhanced mixing which depend on different wind patterns or thermocline depths.

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