Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high‐latitude Southern Hemisphere through oceanic teleconnection
Identifieur interne : 001833 ( Istex/Curation ); précédent : 001832; suivant : 001834Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high‐latitude Southern Hemisphere through oceanic teleconnection
Auteurs : H. Renssen [Pays-Bas] ; H. Goosse [Belgique] ; X. Crosta [France] ; D. M. Roche [Pays-Bas, France]Source :
- Paleoceanography [ 0883-8305 ] ; 2010-09.
Abstract
The impact of the early Holocene Laurentide Ice Sheet (LIS) deglaciation on the climate at Southern Hemisphere high latitudes is studied in three transient simulations performed with a global climate model of the coupled atmosphere‐ocean‐vegetation system. Considering the LIS deglaciation, we quantify separately the impacts of the background meltwater fluxes and the changes in topography and surface albedo. In our model, the meltwater input into the North Atlantic results in a substantial weakening of the Atlantic meridional overturning circulation, associated with absence of deep convection in the Labrador Sea. Northward ocean heat transport by the Atlantic Ocean is reduced by 28%. This weakened ocean circulation leads to cooler North Atlantic Deep Water (NADW). Upwelling of this cool NADW in the Southern Ocean results in reduced surface temperatures (by 1°C to 2°C) here between 9 and 7 ka compared to an experiment without LIS deglaciation. Poleward of the polar front zone, this advective teleconnection between the Southern and Northern hemispheres overwhelms the effect of the “classical” bipolar seesaw mechanism. These results provide an explanation for the relatively cold climatic conditions between 9 and 7 ka reconstructed in several proxy records from Southern Hemisphere high latitudes, such as Antarctic ice cores.
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DOI: 10.1029/2009PA001854
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Renssen</name><affiliation wicri:level="1"><mods:affiliation>Section Climate Change and Landscape Dynamics, Department of Earth Sciences, Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands</mods:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Section Climate Change and Landscape Dynamics, Department of Earth Sciences, Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: hans.renssen@falw.vu.nl</mods:affiliation><country wicri:rule="url">Pays-Bas</country></affiliation></author><author><name sortKey="Goosse, H" sort="Goosse, H" uniqKey="Goosse H" first="H." last="Goosse">H. 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Considering the LIS deglaciation, we quantify separately the impacts of the background meltwater fluxes and the changes in topography and surface albedo. In our model, the meltwater input into the North Atlantic results in a substantial weakening of the Atlantic meridional overturning circulation, associated with absence of deep convection in the Labrador Sea. Northward ocean heat transport by the Atlantic Ocean is reduced by 28%. This weakened ocean circulation leads to cooler North Atlantic Deep Water (NADW). Upwelling of this cool NADW in the Southern Ocean results in reduced surface temperatures (by 1°C to 2°C) here between 9 and 7 ka compared to an experiment without LIS deglaciation. Poleward of the polar front zone, this advective teleconnection between the Southern and Northern hemispheres overwhelms the effect of the “classical” bipolar seesaw mechanism. These results provide an explanation for the relatively cold climatic conditions between 9 and 7 ka reconstructed in several proxy records from Southern Hemisphere high latitudes, such as Antarctic ice cores.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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