Offshore plastics accumulate in rotating ocean gyres because of decreased pressure; which mechanism concentrates these pollutants?

💡 Explanation

Surface plastics accumulate due to Ekman transport convergence, where wind-driven currents spiral inward because deflection and friction combine. This localized pressure gradient traps debris rather than allowing dispersion, therefore concentrating pollutants at the gyre's center; sediment deposition or degradation would not cause concentration.

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