Ocean Currents
Ocean CURRENTS are like rivers within the ocean. SURFACE currents are driven by wind and Earth's rotation. DEEP CURRENTS are driven by density (cold and salty water sinks). Together they form a global "conveyor belt" that moves heat, nutrients, oxygen, and life around the planet. Currents shape climate, fishing, weather, and shipping.
Famous currents. GULF STREAM: warm current that crosses the Atlantic from Florida to Europe. Without it, Britain would be MUCH colder (compare to Labrador at the same latitude). KUROSHIO: Pacific equivalent off Japan. CALIFORNIA CURRENT: cold current along US west coast (creates fog and cool summers). ANTARCTIC CIRCUMPOLAR CURRENT: largest current on Earth, surrounds Antarctica, mixes ocean water globally. THERMOHALINE CIRCULATION: deep global flow taking centuries to complete.
Why is BRITAIN much warmer than CANADA at the same LATITUDE?
Climate change concerns. The thermohaline circulation depends on cold dense water sinking near Greenland and Antarctica. Melting ice is freshening surface water, possibly slowing this circulation. If it slowed dramatically, Europe could COOL while tropics warmed — and global weather patterns would shift. Scientists are watching closely.
Trace a Current
Look up a global ocean current map. Find the Gulf Stream — trace it from the Caribbean to Europe. Notice how it explains the climate of multiple regions.
Ocean currents are some of nature's most powerful global systems. They move enough heat to keep continents habitable. Watching them tells us where climate is heading.
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