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Oceanography · Surface circulation

The ocean isn't standing still.

Every drop of water in the world ocean is on the move. Wind drags the surface, the Coriolis force bends it, continents block it, density gradients sink it. The result is a global system of currents that moves more energy than every river on Earth combined, sets the climate of continents, and ties Greenland's cold to Senegal's warmth. Every particle below traces a possible trajectory through this field.

Sea surface temperature−2 °C28 °C
How the visualisation works

The velocity field is reconstructed from the documented positions, directions, and approximate strengths of the major real surface currents (Talley 2011, NOAA OSCAR, Copernicus Marine Service climatology). It is not a live satellite feed — the goal is a faithful, readable picture of the climatological mean, not the instantaneous state. Coastlines are Natural Earth 110m public-domain vector data. Particle colour is sea surface temperature: each particle carries its own °C value, set on spawn from a latitude-based equilibrium SST and slowly mixed toward the local equilibrium per frame. Fast particles mix more slowly — that is why Gulf Stream and Kuroshio carry their warm orange far into the cold North, and Humboldt, Benguela, and California push cool blues into the tropics.

How it actually works

Four layers, all moving at once.

  1. The five great gyres.

    Subtropical gyres dominate the ocean's surface. Five enormous rotating cells — two in the Atlantic, two in the Pacific, one in the Indian Ocean — driven by trade winds at the equator and westerlies in mid-latitudes, bent by Earth's rotation. Each is roughly the size of a continent. On their western edges they're squeezed into narrow, fast jets: the Gulf Stream, the Kuroshio, the Agulhas, the Brazil Current, the East Australian Current. These boundary currents carry more water than every river on Earth combined.

  2. The Southern Ocean's engine.

    The Antarctic Circumpolar Current runs around the entire planet uninterrupted, between roughly 50° and 65° south. It is the strongest current in the world ocean — about 137 million cubic metres per second of water flowing east, more than 100 times the global river discharge. It thermally isolates Antarctica and connects all three ocean basins in one continuous loop. Without it, the world's climate would be unrecognisable.

  3. The conveyor belt below.

    Surface currents are only half the story. North of Iceland and around the Labrador Sea, warm salty water from the Gulf Stream cools, becomes dense, and sinks two kilometres down. From there it flows south as North Atlantic Deep Water, around Antarctica, and slowly back up across the Indo-Pacific over roughly a thousand years. This Atlantic Meridional Overturning Circulation — the AMOC — is the reason Europe is warmer than its latitude suggests. Recent observations (Caesar et al. 2021, Rahmstorf 2024) show it has weakened by roughly 15% since the mid-twentieth century.

  4. What the currents carry.

    Heat from the tropics to the poles. Carbon dioxide absorbed at high latitudes, locked in the deep for centuries. Nutrients pulled up by coastal upwelling that feeds 20% of global fisheries on less than 1% of ocean area. And, since the 1950s, plastic — concentrating in the five subtropical gyres into garbage patches the size of small countries. The North Pacific gyre alone holds an estimated 1.8 trillion pieces of plastic (Lebreton et al. 2018). The same physics that moves heat moves what we throw in.

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