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Over 1,000 years of data from deep-sea corals have shown that changes in the deep circulation of the ocean around Antarctica can impact the circulation of deep water in the Atlantic, known as the Atlantic Meridional Overturning Circulation (AMOC), an important system of ocean currents that helps to regulate the world's climate. The researchers found that variability in deep water circulation in the Southern Ocean, known as overturning, historically precedes changes in the Atlantic. They also found that the overturning in both hemispheres is the weakest it has been over the past millennium. On top of this, local changes in the North Atlantic since the mid-1900s have exacerbated this already weak Atlantic overturning.
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