Ocean circulation

Key Takeaways

Powerful currents carry water, heat, and life across the planet, connecting the surface ocean to its deepest layers.
Wind-driven surface currents and density-driven deep circulation together form a global ‘conveyor’ that helps regulate Earth’s climate.
WHOI research tracks how ocean circulation works and how it may be changing as the planet warms.

Ocean circulation is the planet’s great conveyor, moving water, heat, and life across the globe through wind-driven surface currents and density-driven deep flows. These currents regulate climate and sustain ecosystems — and WHOI scientists work to understand how they are shifting.

Ocean circulation refers to the flow of water throughout the world's oceans, which acts as a fundamental driver of Earth's climate. This continuous movement redistributes heat, cycles essential nutrients for marine life, and affects the structure and health of ocean ecosystems.

At the ocean's surface, massive looping currents called gyres influence weather patterns and guide the movement of marine species. In the deep ocean, a network of slower currents - part of the Atlantic Meridional Overturning Circulation (AMOC) - transports water and energy between basins over long timescales. Together, these currents form a dynamic system that stabilizes global temperatures and supports life across the planet.

The global ocean circulation system also encompasses periodic phenomena, such as El Niño and La Niña, which can trigger significant shifts in weather patterns and affect fisheries worldwide. In polar regions - especially the Arctic and the North Atlantic - melting ice and changes in salinity play an increasing role in shaping circulation, with the potential to alter global patterns in the future. Oceanographers study circulation to understand how the ocean influences terrestrial conditions, such as climate trends and extreme weather events, and oceanic conditions that affect marine ecosystems.

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