Which shift causes increased ocean upwelling along the South American coast during a La Niña event?

💡 Explanation

During a La Niña event, strengthened trade winds across the Pacific enhance the upwelling process because they push surface water offshore, allowing nutrient-rich deep ocean water to rise. Therefore increased upwelling results, rather than decreased upwelling. Humboldt current weakening or temperature elevation do not drive La Niña upwelling.

• Which process contributes to the formation of deep anoxic basins within fjord environments with restricted sills?
• Which mechanism causes meandering stream formation across flat plains undergoing regional uplift?
• What occurs to local ocean temperature when a prolonged period of decreased trade winds weakens coastal upwelling?
• Which mechanism causes density changes which drive thermohaline circulation in global oceans?
• Which sediment transport mechanism dominates the formation of a rock glacier initiating from a cirque?
• Which geomorphological outcome occurs when carbonic acid exceeds limestone dissolution limits?