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← GeographyWhich thermocline change accompanies strong El Niño effects?
A)East Pacific thermocline deepens considerably✓
B)Upwelling strengthens off South America
C)West Pacific warm pool expands eastward
D)Global average sea ice increases slightly
💡 Explanation
El Niño intensifies the equatorial countercurrent, leading to a suppressed thermocline in the eastern Pacific because increased warm water overrides colder, deeper water. This process, termed thermocline displacement, causes deeper isotherms in the Eastern Pacific, therefore the thermocline deepens rather than shallowing.
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