Geography • World GeographyHard
In the context of global ocean circulation, the phenomenon known as 'El Nino-Southern Oscillation' is initiated by anomalies in which of the following oceanic and atmospheric interactions?
A. Cooling of the western North Atlantic ocean surface waters combined with weakened polar vortex winds
B. Waning of trade winds in the equatorial Pacific, leading to a warming of surface waters off the coast of Peru✓ Correct Answer
C. Intensification of Antarctic circumpolar currents causing increased upwelling along the South American coast
D. Shifting monsoon troughs over the Indian Ocean disrupting normal Walker circulation cells
💡 Solution & Explanation
El Nino is characterized by the weakening or reversal of the easterly trade winds in the equatorial Pacific Ocean, which reduces upwelling of cold nutrient-rich water along the western coast of South America and causes warm surface water pools to spread eastward. This disruption alters global atmospheric pressure patterns and impacts rainfall distribution across continents. La Nina represents the opposite phase featuring enhanced trade winds and abnormally cool eastern Pacific temperatures. Ocean-atmosphere coupling drives multi-year climatic variations worldwide.
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