Which phenomenon causes nutrient depletion in surface waters along the coast of South America during El Niño events?

💡 Explanation

During El Niño, weakened trade winds diminish upwelling because the thermocline deepens, reducing the availability of nutrient-rich colder water at the surface. Therefore suppressed upwelling occurs, rather than algal blooms, increased runoff, or reduced solar absorption, all of which require different oceanic conditions.

• Which climatic effect results when volcanic aerosols remain suspended in atmosphere after large eruption?
• Which outcome occurs when a barrier island migrates landward?
• Which outcome occurs when stress exceeds static friction along an existing transform fault?
• Which risk is greatly increased when streamflow in an ephemeral stream bed suddenly transitions from laminar to turbulent due to heavy rainfall?
• Which outcome occurs from low-pressure cell formation influenced by the Coriolis effect?
• Which geophysical outcome primarily disrupts global anchovy populations from South American upwelling regions during an El Niño event?