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dc.contributor.authorJensen, Mari F.  Concept link
dc.contributor.authorNisancioglu, Kerim H.  Concept link
dc.contributor.authorSpall, Michael A.  Concept link
dc.date.accessioned2018-12-06T16:27:47Z
dc.date.available2018-12-06T16:27:47Z
dc.date.issued2018-05-31
dc.identifier.citationJournal of Climate 31 (2018): 4847-4863en_US
dc.identifier.urihttps://hdl.handle.net/1912/10767
dc.descriptionAuthor Posting. © American Meteorological Society, 2018. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 31 (2018): 4847-4863, doi:10.1175/JCLI-D-17-0802.1.en_US
dc.description.abstractThe sensitivity of sea ice to the temperature of inflowing Atlantic water across the Greenland–Scotland Ridge is investigated using an eddy-resolving configuration of the Massachusetts Institute of Technology General Circulation Model with idealized topography. During the last glacial period, when climate on Greenland is known to have been extremely unstable, sea ice is thought to have covered the Nordic seas. The dramatic excursions in climate during this period, seen as large abrupt warming events on Greenland and known as Dansgaard–Oeschger (DO) events, are proposed to have been caused by a rapid retreat of Nordic seas sea ice. Here, we show that a full sea ice cover and Arctic-like stratification can exist in the Nordic seas given a sufficiently cold Atlantic inflow and corresponding low transport of heat across the Greenland–Scotland Ridge. Once sea ice is established, continued sea ice formation and melt efficiently freshens the surface ocean and makes the deeper layers more saline. This creates a strong salinity stratification in the Nordic seas, similar to today’s Arctic Ocean, with a cold fresh surface layer protecting the overlying sea ice from the warm Atlantic water below. There is a nonlinear response in Nordic seas sea ice to Atlantic water temperature with simulated large abrupt changes in sea ice given small changes in inflowing temperature. This suggests that the DO events were more likely to have occurred during periods of reduced warm Atlantic water inflow to the Nordic seas.en_US
dc.description.sponsorshipThe research was supported by the Centre for Climate Dynamics at the Bjerknes Centre for Climate Research. The research leading to these results is part of the ice2ice project funded by the European Research Council under the European Community Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement 610055.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/JCLI-D-17-0802.1
dc.subjectOceanen_US
dc.subjectArcticen_US
dc.subjectSea iceen_US
dc.subjectOcean dynamicsen_US
dc.subjectPaleoclimateen_US
dc.subjectGeneral circulation modelsen_US
dc.titleLarge changes in sea ice triggered by small changes in Atlantic water temperatureen_US
dc.typeArticleen_US
dc.identifier.doi10.1175/JCLI-D-17-0802.1


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