Which atmospheric effect propagates eastward during moderate El Niño events across the Pacific?

💡 Explanation

During El Niño, weakening trade winds trigger an eastward shift of warm water, causing the Walker circulation, normally characterized by rising air in the west and sinking air in the east, to reverse. Therefore, the Walker circulation reversal results, rather than amplification, intensification, or weakening, which are caused by separate climatic forcings.

• Which mechanism primarily causes downslope movement of the active layer during solifluction?
• Which mechanism causes intermediate-depth earthquakes along subduction zones?
• Which process determines shape when freeze-thaw weakens bedrock walls above a glacial cirque?
• Which outcome occurs when a locked fault suddenly ruptures?
• Which mechanism primarily controls the orientation of cirque-formed valleys within a glaciated mountain range?
• Which sediment transport mechanism causes varves to form in glacial lakes during seasonal changes?