Which biogeochemical effect occurs when coastal upwelling is suppressed due to stronger subtropical gyre stratification?

💡 Explanation

When stronger gyre stratification traps nutrients in deeper layers, it limits upward mixing due to reduced density gradients, which decrease nutrient availability in the photic zone. Therefore decreased marine primary productivity results, rather than increased nitrogen fixation, enhanced carbon sequestration, or reef growth which require nutrient-rich upwelling.

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