Strong warming causes the deep overturning circulation to collapse. The University of California, Irvine Earth system scientists have found that the Atlantic and Southern oceans' deep circulation patterns are slowing down due to climate-driven heating of seawater. If this continues, the ocean's abi
The simulations suggest that under worst-case warming, the Southern Meridional Overturning Circulation could cease entirely by 2300.University of California, Irvine
“Analysis of the projections from 36 Earth system models over a range of climate scenarios shows that unchecked global warming could lead to a shutdown of the ocean deep circulation,” said co-author J. Keith Moore, UCI professor of Earth system science. “This would be a climate disaster similar in magnitude to the complete melting of the ice sheets on land.”In the Atlantic, as warm water flows northwards on the surface, it cools and evaporates, making it saltier and denser.
“A disruption in circulation would reduce ocean uptake of carbon dioxide from the atmosphere, intensifying and extending the hot climate conditions,” Moore said. “Over time the nutrients that support marine ecosystems would increasingly become trapped in the deep ocean, leading to declining global-ocean biological productivity.”
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