Which geophysical effect results from weakened trade winds in the equatorial Pacific Ocean during El Niño?

💡 Explanation

When trade winds weaken, El Niño conditions develop because the westward transport of surface water declines, reducing upwelling of cold, nutrient-rich water along the South American coast. Therefore reduced upwelling occurs, rather than current intensification, cyclone formation, or ice sheet melting, which involve different triggers and ocean regions.

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