Freshwater forcing of the Atlantic Meridional Overturning Circulation revisited
Freshwater (FW) forcing is widely identified as the dominant mechanism causing reductions of the Atlantic Meridional Overturning Circulation (AMOC), a climate tipping point that led to past abrupt millennial-scale climate changes. However, the AMOC response to FW forcing has not been rigorously asse...
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| Veröffentlicht in: | Nature climate change 2022-05, Vol.12 (5), p.449-454 |
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| description | Freshwater (FW) forcing is widely identified as the dominant mechanism causing reductions of the Atlantic Meridional Overturning Circulation (AMOC), a climate tipping point that led to past abrupt millennial-scale climate changes. However, the AMOC response to FW forcing has not been rigorously assessed due to the lack of long-term AMOC observations and uncertainties of sea-level rise and ice-sheet melt needed to infer past FW forcing. Here we show a muted AMOC response to FW forcing (~50 m sea-level rise from the final deglaciation of Northern Hemisphere ice sheets) in the early-to-middle Holocene ~11,700–6,000 years ago. Including this muted AMOC response in a transient simulation of the Holocene with an ocean–atmosphere climate model improves the agreement between simulated and proxy temperatures of the past 21,000 years. This demonstrates that the AMOC may not be as sensitive to FW fluxes and Arctic freshening as is currently projected for the end of the twenty-first century.
The Atlantic Meridional Overturning Circulation plays a central role in global climate through its transport of heat, carbon and fresh water. Its sensitivity to freshwater input change is shown to be muted when fluxes associated with the final Northern Hemisphere deglaciation are considered. |
| doi_str_mv | 10.1038/s41558-022-01328-2 |
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(ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Freshwater forcing of the Atlantic Meridional Overturning Circulation revisited</atitle><jtitle>Nature climate change</jtitle><stitle>Nat. Clim. Chang</stitle><date>2022-05-01</date><risdate>2022</risdate><volume>12</volume><issue>5</issue><spage>449</spage><epage>454</epage><pages>449-454</pages><issn>1758-678X</issn><eissn>1758-6798</eissn><abstract>Freshwater (FW) forcing is widely identified as the dominant mechanism causing reductions of the Atlantic Meridional Overturning Circulation (AMOC), a climate tipping point that led to past abrupt millennial-scale climate changes. However, the AMOC response to FW forcing has not been rigorously assessed due to the lack of long-term AMOC observations and uncertainties of sea-level rise and ice-sheet melt needed to infer past FW forcing. Here we show a muted AMOC response to FW forcing (~50 m sea-level rise from the final deglaciation of Northern Hemisphere ice sheets) in the early-to-middle Holocene ~11,700–6,000 years ago. Including this muted AMOC response in a transient simulation of the Holocene with an ocean–atmosphere climate model improves the agreement between simulated and proxy temperatures of the past 21,000 years. This demonstrates that the AMOC may not be as sensitive to FW fluxes and Arctic freshening as is currently projected for the end of the twenty-first century.
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| subjects | 704/106/413 704/106/694/1108 704/106/694/2786 704/829/2737 Atlantic Meridional Overturning Circulation (AMOC) Climate Climate Change Climate Change/Climate Change Impacts Climate models Cold Deglaciation Earth and Environmental Science Environment Environmental Law/Policy/Ecojustice Environmental Sciences & Ecology Fluxes Fresh water Freshwater Glaciation Global climate Holocene Ice sheets Inland water environment Kinematics Meltwater Meteorology & Atmospheric Sciences Northern Hemisphere Oceans Sea level Sea level changes Sea level rise Simulation Temperature |
| title | Freshwater forcing of the Atlantic Meridional Overturning Circulation revisited |
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