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Irvali, N,Ninnemann, US,Kleiven, HF,Galaasen, EV,Morley, A,Rosenthal, Y
2016
October
Quaternary Science Reviews
Evidence for regional cooling, frontal advances, and East Greenland Ice Sheet changes during the demise of the last interglacial
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Eirik drift Greenland Ice Sheet North Atlantic Last interglacial Glacial inception Multi-proxy SUBPOLAR NORTH-ATLANTIC DEEP-OCEAN CIRCULATION ISOTOPE SUBSTAGE 5E NORDIC SEAS GLACIAL INCEPTION LABRADOR SEA TEMPERATURE-CHANGES SOUTHERN GREENLAND ICEBERG DISCHARGES RAFTED DEBRIS
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High-resolution lithic and sea surface climate records are used to portray the progression of North Atlantic climate, hydrography, and Greenland Ice Sheet (GIS) activity through the peak of Marine Isotope Stage (MIS) 5e into the last glacial inception. We use Eirik Drift sediment core MD03-2664 (57 degrees 26.34'N, 48 degrees 36.35'W), recovered south of Greenland, strategically located to monitor fluctuations in GIS extent and iceberg calving events. Our results show that a significant amount of ice-rafted debris (IRD) was present during the early MIS 5e, until gradually tapering off by 122 kyr BP due to a diminishing GIS. Sea surface temperatures (SSTs) in the northern subpolar gyre reached peak values early in MIS 5e coinciding with peak insolation. Regional cooling leading to the demise of the last interglacial started prior to the end of the MIS 5e benthic delta O-18 plateau, at approximately 119 kyr BP, as summer insolation waned. This gradual cooling trend is interrupted by an abrupt and brief cooling episode at similar to 117 kyr BP. Increased IRD abundance during the 117 kyr BP cooling event suggests that regional ice sheet growth occurred prior to the end of the MIS 5e benthic delta O-18 plateau, and the major glacial inception. SSTs south of Greenland followed a two-step cooling during the glacial inception similar to the pattern observed across much of the North Atlantic and Europe. Benthic delta O-18 increases in parallel, suggesting that this two-step cooling is linked to a two-phased intensification of Northern Hemisphere glaciation. (C) 2016 The Authors. Published by Elsevier Ltd.
10.1016/j.quascirev.2016.08.029
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