Which outcome is directly caused by convergence within subtropical gyres impacting marine ecosystems?

💡 Explanation

When surface currents converge within subtropical gyres, the Stokes drift mechanism pushes floating plastic debris towards the centre, because objects float towards areas with less wave action, concentrating pollutants. Therefore accumulation of plastic debris results, rather than upwelling, methane release, or ice melting that each require fundamentally different drivers.

• Which atmospheric effect amplifies surface temperature increase strongest with decreasing albedo?
• Which mechanism causes increased flood risk when an alluvial fan experiences rapid urbanization?
• Which weathering process primarily facilitates the formation of a cirque in alpine environments?
• Which long-term outcome arises because effusive lava eruptions accumulate?
• Which seismic hazard intensifies due to soil liquefaction along transform fault zones during an earthquake?
• Which outcome develops when rainfall accelerates the weathering of carbonate bedrock?