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dc.contributor.authorIvanovic, Ruza F.
dc.contributor.authorGregoire, Lauren J.
dc.contributor.authorWickert, Andrew D.
dc.contributor.authorValdes, Paul J.
dc.contributor.authorBurke, Andrea
dc.identifier.citationIvanovic , R F , Gregoire , L J , Wickert , A D , Valdes , P J & Burke , A 2017 , ' Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation ' , Geophysical Research Letters , vol. 44 , no. 1 , pp. 383-392 .
dc.identifier.otherPURE: 248480794
dc.identifier.otherPURE UUID: 1cca33c6-6e5b-42ea-ab50-b9026e5067c6
dc.identifier.otherScopus: 85009186310
dc.identifier.otherWOS: 000393954900045
dc.identifier.otherORCID: /0000-0002-3754-1498/work/64034547
dc.descriptionRFI is funded by NERC grant #NE/K008536/1. Numerical climate model simulations made use of the N8 HPC Centre of Excellence (N8 consortium and EPSRC Grant #EP/K000225/1).en
dc.description.abstractCollapse of ice sheets can cause significant sea-level rise and widespread climate change. We examine the climatic response to meltwater generated by the collapse of the Cordilleran-Laurentide ice saddle (North America) ~14.5 thousand years ago (ka) using a high-resolution drainage model coupled to an ocean-atmosphere-vegetation general circulation model. Equivalent to 7.26 m global mean sea-level rise in 340 years, the meltwater caused a 6 sverdrup weakening of Atlantic Meridional Overturning Circulation (AMOC) and widespread Northern Hemisphere cooling of 1-5 °C. The greatest cooling is in the Atlantic-sector high latitudes during Boreal winter (by 5-10 °C), but there is also strong summer warming of 1-3 °C over eastern North America. Following recent suggestions that the saddle collapse was triggered by the Bølling warming event ~14.7-14.5 ka, we conclude that this robust submillennial mechanism may have initiated the end of the warming and/or the Older Dryas cooling through a forced AMOC weakening.
dc.relation.ispartofGeophysical Research Lettersen
dc.rights© 2016 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.subjectIce sheet melten
dc.subjectSaddle collapseen
dc.subjectOlder Dryasen
dc.subjectGE Environmental Sciencesen
dc.subjectSDG 13 - Climate Actionen
dc.titleCollapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulationen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. St Andrews Isotope Geochemistryen
dc.contributor.institutionUniversity of St Andrews. Earth and Environmental Sciencesen
dc.description.statusPeer revieweden

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