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dc.contributor.authorIrvali, Nil
dc.contributor.authorGalaasen, Eirik Vinje
dc.contributor.authorNinnemann, Ulysses S
dc.contributor.authorRosenthal, Yair
dc.contributor.authorBorn, Andreas
dc.contributor.authorKleiven, Helga Flesche
dc.PublishedIrvali N, Galaasen EV, Ninnemann US, Rosenthal Y, Born A, Kleiven HF. A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene. Proceedings of the National Academy of Sciences of the United States of America. 2020;117(1):190-195eng
dc.description.abstractThe Greenland Ice Sheet (GIS) has been losing mass at an accelerating rate over the recent decades. Models suggest a possible temperature threshold between 0.8 and 3.2 °C, beyond which GIS decline becomes irreversible. The duration of warmth above a given threshold is also a critical determinant for GIS survival, underlining the role of ocean warming, as its inertia prolongs warmth and triggers longer-term feedbacks. The exact point at which these feedbacks are triggered remains equivocal. Late Pleistocene interglacials provide potential case examples for constraining the past response of the GIS to a range of climate states, including conditions warmer than present. However, little is known about the magnitude and duration of warming near Greenland during these periods. Using high-resolution multiproxy surface ocean climate records off southern Greenland, we show that the previous 4 interglacials over the last ∼450 ka all reached warmer than present climate conditions and exceeded the modeled temperature threshold for GIS collapse but by different magnitudes and durations. Complete deglaciation of the southern GIS in Marine Isotope Stage 11c (MIS 11c; 394.7 to 424.2 ka) occurred under climates only slightly warmer than present (∼0.5 ± 1.6 °C), placing the temperature threshold for major GIS retreat in the lower end of model estimates and within projections for this century.en_US
dc.publisherNational Academy of Sciencesen_US
dc.rightsAttribution CC BY-NC-ND 4.0eng
dc.subjectGreenland Ice Sheeteng
dc.subjectLate Pleistocene interglacialseng
dc.subjectClimate changeeng
dc.titleA low climate threshold for south Greenland Ice Sheet demise during the Late Pleistoceneen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2020 The Author(s)en_US
dc.source.journalProceedings of the National Academy of Sciences of the United States of America
dc.relation.projectNorges forskningsråd: 254964

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Attribution CC BY-NC-ND 4.0
Except where otherwise noted, this item's license is described as Attribution CC BY-NC-ND 4.0