Which risk significantly increases when coastal upwelling currents weaken during an El Niño event?

A)Decline in marine primary productivity✓

B)Intensified coastal erosion from storm surges

C)Increased frequency of underwater landslides

D)Expansion of oxygen dead zones offshore

💡 Explanation

When upwelling weakens, nutrient-rich deep water is no longer transported to the surface because the trade winds decrease, impacting phytoplankton growth, triggering decline in marine primary productivity. Therefore decrease in bioproductivity results, rather than increased erosion, landslides, or dead zone expansion, that related a different specific El Nino consequences.

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Which risk significantly increases when coastal upwelling currents weaken during an El Niño event?

💡 Explanation

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