Which climatic effect weakens near South America during El Niño?

💡 Explanation

Coastal upwelling weakens during El Niño because the Walker circulation weakens, reducing trade winds that normally drive upwelling; therefore, nutrient-rich waters are not brought to the surface, rather than intense storms which aren't directly determined, or ozone layer changes.

• Which long-term effect arises from carbonic acid presence?
• Which outcome occurs when rapid sedimentation chokes an alluvial fan?
• Which mechanism triggers mudflow surge on an alluvial fan after intense rainfall?
• Which risk increases when rapidly rising floodwater overtops a natural levee along a major river?
• What results where prevailing winds encounter topography blocking particle saltation?
• Which outcome occurs when rapid snowmelt saturates upland streams?