Which cascading effect occurs when the Walker circulation weakens during an El Niño event across pacific ocean?

💡 Explanation

When Walker circulation weakens due El Niño, upwelling of nutrient-rich waters diminishes because reduced trade winds lessen the vertical mixing, thus reducing nutrient availability in surface seawater. Therefore reduced nutrient availability, instead of enhance upwelling or reducing themocline, happens, because upwelling depends on wind driven mixing.

• Which outcome is observed due to aeolian Abrasion?
• Which risk increases following a catastrophic levee breach due to overtopping during an extreme flood event?
• Near a gradually subsiding river delta which outcome occurs due to the reduced sediment supply?
• Which outcome occurs when vegetation loss destabilizes alluvial terraces?
• Which mechanism causes liquefaction of soil during an earthquake in a saturated sandy deposit?
• Which outcome results from increased freeze-thaw cycles on alpine sandstone?