Which risk increases when increased freshwater runoff disrupts the density gradient within a subtropical gyre?

💡 Explanation

When freshwater runoff increases, salinity decreases, weakening the density gradient because density differences drive vertical mixing essential for nutrient resupply to the photic zone and hence carbon sequestration. Therefore, decreased carbon sequestration results, rather than altered upwelling, hydrothermal vents, or mangrove expansion which require geologic or coastal processes.

• Which process causes lateral stream deflection when strong prevailing winds encounter an advancing glacier?
• Which atmospheric effect causes increased rainfall on the windward side of mountain ranges aligned perpendicular to prevailing winds?
• What outcome arises as meltwater discharge decreases at glacial alluvial fans?
• Which consequence results when overgrazing reduces bioturbation rates?
• Which feedback consequence accelerates stalactite growth in temperate climates?
• Which effect does increased atmospheric carbon dioxide exert via radiative forcing on permafrost regions?