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 effect commonly arises where a transform fault connects two divergent plate boundaries on the ocean floor?
• Which physical characteristic primarily drives the downwelling of surface water within ocean gyres?
• Which geomorphic risk is most amplified when infrastructure development disrupts thermokarst processes within permafrost regions?
• Which risk increases when a cutoff process shortens a fluvial meander?
• Which mechanism amplifies seismic wave intensity in basins with soft sedimentary rock fillings during an earthquake?
• Which process develops steep headwalls in cirque formations during glacial retreat?