Near South America, which outcome accompanies El Niño's weakening thermocline?

💡 Explanation

Weaker trade-winds drive downwelling, sinking warm water and reducing upwelling of cold, nutrient-rich waters due to oceanic subsidence. Therefore, nutrient supplies diminish along the coast, rather than increasing primary productivity under calmer conditions.

• Which mechanism causes crustal thickening when thrust faulting occurs in collisional mountain belts?
• Which outcome increases following hydraulic fracturing-induced fault reactivation?
• Which risk increases when thawing permafrost destabilizes infrastructure foundations?
• Which consequence results when river discharge overwhelms levee stability?
• Which ecological outcome occurs when deep ocean upwelling declines?
• Which consequence results when a pyroclastic surge encounters standing water?