globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.08.029
Scopus记录号: 2-s2.0-84983628429
论文题名:
Evidence for regional cooling, frontal advances, and East Greenland Ice Sheet changes during the demise of the last interglacial
作者: Irvalı N.; Ninnemann U.S.; Kleiven H.K.F.; Galaasen E.V.; Morley A.; Rosenthal Y.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 150
起始页码: 184
结束页码: 199
语种: 英语
英文关键词: Eirik drift ; Glacial inception ; Greenland Ice Sheet ; Last interglacial ; Multi-proxy ; North Atlantic
Scopus关键词: Atmospheric temperature ; Glaciers ; Ice ; Incident solar radiation ; Oceanography ; Sea ice ; Solar radiation ; Surface waters ; Eirik drift ; Glacial inception ; Greenland Ice Sheet ; Last interglacial ; Multi proxies ; North Atlantic ; Glacial geology ; benthic environment ; cooling ; core analysis ; frontal feature ; glaciation ; gyre ; ice-rafted debris ; iceberg calving ; Last Interglacial ; marine isotope stage ; Northern Hemisphere ; oxygen isotope ; proxy climate record ; sea surface temperature ; Arctic ; Atlantic Ocean ; Atlantic Ocean (North) ; Eirik Drift ; Europe ; Greenland ; Greenland Ice Sheet
英文摘要: 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°26.34′N, 48°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 δ18O plateau, at approximately 119 kyr BP, as summer insolation waned. This gradual cooling trend is interrupted by an abrupt and brief cooling episode at ∼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 δ18O 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 δ18O increases in parallel, suggesting that this two-step cooling is linked to a two-phased intensification of Northern Hemisphere glaciation. © 2016 The Authors
资助项目: The authors are grateful to IPEV, the captain and the crew of the Marion Dufresne and to the scientific party of the IMAGES P.I.C.A.S.S.O cruise. We also thank Dag Inge Blindheim and Rune Søraas at Uni Research for help with sample preparation and stable isotope analyses and Eva Bjørseth at Department of Earth Science for help with the map construction. This work is a contribution of the European Science Foundation EuroMARC program, through the AMOCINT project (grant number 187166), funded through grants from the Research Council of Norway, and RCN Frinatek project NOCWARM (grant number 205524), and contributes to EU-FP7 IP Past4Future. U. Ninnemann received funding for this study from a University of Bergen Meltzer research grant.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59452
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作者单位: Department of Earth Science, University of Bergen, Allégaten 41, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; Discipline of Geography, National University of Ireland, University Road, Galway, Ireland; Institute of Marine and Coastal Sciences and Department of Geology Rutgers, The State University of New Jersey, 71 Dudley Road, New Brunswick, NJ, United States

Recommended Citation:
Irvalı N.,Ninnemann U.S.,Kleiven H.K.F.,et al. Evidence for regional cooling, frontal advances, and East Greenland Ice Sheet changes during the demise of the last interglacial[J]. Quaternary Science Reviews,2016-01-01,150
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