Geography • Physical GeographyMedium
What is the primary factor driving the thermohaline circulation (ocean conveyor belt) in the global ocean system?
A. Tidal forces of the Moon and Sun
B. Differences in water temperature and salinity✓ Correct Answer
C. Surface wind stress from trade winds
D. Geothermal heating at mid-ocean ridges
💡 Solution & Explanation
The global thermohaline circulation is fundamentally driven by density gradients, which are determined by variations in water temperature and salinity, a process where cold and salty water sinks at high latitudes and initiates deep ocean currents. Surface wind stress drives wind-driven surface currents rather than the deep global conveyor belt, while lunar tidal forces and geothermal heating play negligible roles in powering this planetary-scale circulation. This oceanic conveyor belt plays a critical role in regulating global climate by redistributing heat around the earth.
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