Which climate outcome occurs when Walker circulation weakens during intense El Niño events?

💡 Explanation

When Walker circulation weakens, reduced east-to-west pressure gradient causes diminished upwelling because the surface water movement is suppressed by weaker winds. It is linked to El Nino events that develop along the South American coast. Therefore, decreased upwelling results, rather than increased rainfall, strengthened winds, or lower temperatures which all indicate normal or La Nina conditions.

• Which geological change accelerates stream erosion in regions undergoing rapid glacial retreat?
• Which process determines cirque orientation, influencing snow accumulation and glacial formation?
• Which mechanism causes crustal thinning directly above a strike-slip fault zone?
• Which primary mechanism dictates cirque orientation disproportionately towards northeastern aspects in the Northern Hemisphere?
• Which mechanism limits delta formation when rapid sea-level rise inundates an alluvial plain?
• Which risk significantly increases near a subduction zone after a megathrust earthquake?