The ocean conveyor belt, scientifically termed the global meridional overturning circulation (MOC), is a planetary-scale, density-driven circulation system that links surface and deep waters across all major ocean basins. It is governed primarily by thermohaline processes, whereby variations in temperature and salinity control seawater density, inducing deep-water formation in high-latitude regions (e.g., North Atlantic) and upwelling in lower latitudes and the Southern Ocean. This circulation redistributes heat, dissolved gases, nutrients, and biogeochemical tracers, exerting strong control on Earth’s climate system, carbon cycle, and deep-ocean ventilation on decadal to millennial timescales.
When polar ice sheets melt, the effects ripple across the world. The melting ice raises average global sea level, alters ocean currents and affects temperatures in places far from the poles.
Environment
Nov 25, 2025
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The Atlantic Meridional Overturning Circulation (AMOC), a system of Atlantic Ocean currents that redistributes heat and nutrients between the tropics and the North Atlantic, is one of the planet's tipping points. That means ...
The Atlantic Meridional Overturning Circulation (AMOC) is an enormous loop of ocean current in the Atlantic Ocean that carries warmer waters north and colder waters south, helping to regulate the climate in many regions. ...
Monitoring changes in water temperature and pressure at the seafloor can improve understanding of ocean circulation, climate, and natural hazards such as tsunamis. In recent years, scientists have begun gathering submarine ...
Earth Sciences
Jul 16, 2025
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From more frequent wildfires to rising sea levels, climate change is disrupting ecosystems and upending once-stable weather patterns. One particularly alarming consequence of rising global temperatures is the potential collapse ...
A patch of the Atlantic Ocean just south of Greenland is cooling while much of the world warms. The origin of this "cold blob" has been linked to weakening ocean currents that help regulate global climate—called the Atlantic ...
Earth Sciences
Jul 1, 2025
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At this year's Living Planet Symposium, attendees heard how ESA's Next Generation Gravity Mission could provide the first opportunity to directly track a vital ocean circulation system that warms our planet—but is now weakening, ...
Earth Sciences
Jun 26, 2025
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For more than a century, a patch of cold water south of Greenland has resisted the Atlantic Ocean's overall warming, fueling debate among scientists. A new study identifies the cause as the long-term weakening of a major ...
Earth Sciences
Jun 21, 2025
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Despite global reductions in mercury emissions, mercury concentrations in Arctic wildlife continue to rise. A study published in Nature Communications by researchers from Aarhus University and the University of Copenhagen ...
Environment
Jun 12, 2025
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In the southern flanks of the Indian Ocean and the central and eastern Pacific, just north of the Antarctic Circumpolar Current, lie the Subantarctic Mode Waters. As part of the global ocean conveyor belt, these large masses ...
Earth Sciences
Jun 2, 2025
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