Which mechanism directly drives the poleward transport of heat within thermohaline circulation?

💡 Explanation

When surface water cools and/or increases in salinity, buoyancy decreases and density increases, causing the water to sink and creating density gradients driving deep ocean currents. Therefore buoyancy-driven density gradients drive circulation, rather than salinity alone, wind, or tides, which contribute to other transport mechanisms.

• Which risk increases when a subsurface fault line intersects a large reservoir?
• Which process establishes distinct stratification layers within a dimictic lake?
• Which mechanism maintains constant Hadley Cell boundaries despite seasonal solar variations?
• During strong El Niño phases, which mechanism increases nutrient stratification influencing marine ecosystems off Peru?
• Which outcome occurs when the descending slab stagnates during subduction?
• Which risk increases when thawing permafrost destabilizes coastal cliffs near settlements?