Phys.org June 7, 2022
Climate projections suggest a weakening or collapse of the Atlantic Meridional Overturning Circulation (AMOC) under global warming, with evidence that a slowdown is already underway. This could have significant ramifications for Atlantic Ocean heat transport, Arctic Sea ice extent and regional North Atlantic climate. However, the potential for far-reaching effects, such as teleconnections to adjacent basins and into the Southern Hemisphere, remains unclear. Researchers in Australia used a global climate model to show that AMOC collapse can accelerate the Pacific trade winds and Walker circulation by leaving an excess of heat in the tropical South Atlantic. An Atlantic overturning shutdown would be felt as far south as Antarctica. Rising warm air over the West Pacific would trigger wind changes that propagate south to Antarctica. This would deepen the atmospheric low-pressure system over the Amundsen Sea, which sits off west Antarctica. These findings have important implications for understanding the global climate response to ongoing greenhouse gas increases…read more. TECHNICAL ARTICLE
Schematic of the global climatic response to AMOC shutdown. Credit: Nature Climate Change (2022)