What’s the Atlantic Meridional Overturning Circulation (AMOC)?

The global conveyor belt, shown here, circulates cool subsurface water and warm surface water throughout the world.

The worldwide conveyor belt, proven right here, circulates cool subsurface water and heat floor water all through the world. The Atlantic Meridional Overturning Circulation is a part of this complicated system of worldwide ocean currents. This illustration is captured from a brief video produced by NOAA Science on a Sphere.

The ocean’s water is continually circulated by currents. Tidal currents happen near shore and are influenced by the solar and moon. Floor currents are influenced by the wind. Nevertheless, different, a lot slower currents that happen from the floor to the seafloor are pushed by modifications within the saltiness and ocean temperature, a course of known as thermohaline circulation. These currents are carried in a big “international conveyor belt,” which incorporates the AMOC.

AMOC stands for Atlantic Meridional Overturning Circulation. The AMOC circulates water from north to south and again in an extended cycle inside the Atlantic Ocean. This circulation brings heat to varied components of the globe and in addition carries vitamins essential to maintain ocean life.

The circulation course of begins as heat water close to the floor strikes towards the poles (such because the Gulf Stream within the North Atlantic), the place it cools and types sea ice. As this ice types, salt is left behind within the ocean water. Because of the great amount of salt within the water, it turns into denser, sinks down, and is carried southwards within the depths beneath. Finally, the water will get pulled again up in direction of the floor and warms up in a course of known as upwelling, finishing the cycle.

The whole circulation cycle of the AMOC, and the worldwide conveyor belt, is kind of gradual. It takes an estimated 1,000 years for a parcel (any given cubic meter) of water to finish its journey alongside the belt. Although the entire course of is gradual by itself, there may be some proof that the AMOC is slowing down additional. NOAA funds analysis to raised perceive this potential slowing, in addition to to analyze the AMOC’s position in coastal sea degree modifications and its relationship to excessive occasions.

Is the AMOC slowing down?

As our local weather continues to vary, is there a risk that the AMOC will decelerate, or come to a whole cease? Whereas analysis exhibits it’s weakening over the previous century, whether or not or not it can proceed to gradual or cease circulating fully stays unsure. If the AMOC does proceed to decelerate, nonetheless, it may have far-reaching local weather impacts. For instance, if the planet continues to heat, freshwater from melting ice on the poles would shift the rain belt in South Africa, inflicting droughts for hundreds of thousands of individuals. It might additionally trigger sea degree rise throughout the U.S. East Coast.

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