Variability of the Denmark Strait Overflow during the Last Glacial Maximum
2008; Wiley; Volume: 35; Issue: 1 Linguagem: Inglês
10.1111/j.1502-3885.2006.tb01112.x
ISSN1502-3885
AutoresChristian Millo, Michael Sarnthein, Antje H L Voelker, Helmut Erlenkeuser,
Tópico(s)Methane Hydrates and Related Phenomena
ResumoBoreasVolume 35, Issue 1 p. 50-60 Free to Read Variability of the Denmark Strait Overflow during the Last Glacial Maximum CHRISTIAN MILLO, Corresponding Author CHRISTIAN MILLO Department of Geosciences, Kiel University, Olshausenstrasse 40, D-24118 Kiel, Germany e-mail: cm@gpi. uni-kiel. deSearch for more papers by this authorMICHAEL SARNTHEIN, MICHAEL SARNTHEIN Department of Geosciences, Kiel University, Olshausenstrasse 40, D-24118 Kiel, GermanySearch for more papers by this authorANTJE VOELKER, ANTJE VOELKER INETI Department of Marine Geology, Estrada da Portela, Zambujal, 2720 Alfragide, PortugalSearch for more papers by this authorHELMUT ERLENKEUSER, HELMUT ERLENKEUSER Leibniz-Labor for Radiometric Dating and Isotope Research, Max-Eyth-Strasse 11, D-24118 Kiel, GermanySearch for more papers by this author CHRISTIAN MILLO, Corresponding Author CHRISTIAN MILLO Department of Geosciences, Kiel University, Olshausenstrasse 40, D-24118 Kiel, Germany e-mail: cm@gpi. uni-kiel. deSearch for more papers by this authorMICHAEL SARNTHEIN, MICHAEL SARNTHEIN Department of Geosciences, Kiel University, Olshausenstrasse 40, D-24118 Kiel, GermanySearch for more papers by this authorANTJE VOELKER, ANTJE VOELKER INETI Department of Marine Geology, Estrada da Portela, Zambujal, 2720 Alfragide, PortugalSearch for more papers by this authorHELMUT ERLENKEUSER, HELMUT ERLENKEUSER Leibniz-Labor for Radiometric Dating and Isotope Research, Max-Eyth-Strasse 11, D-24118 Kiel, GermanySearch for more papers by this author First published: 28 June 2008 https://doi.org/10.1111/j.1502-3885.2006.tb01112.xCitations: 12AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic effects which reduced its depth (today ∼630 m) by ∼130 m. These factors, combined with a reduced north-south density gradient of the water-masses, are expected to have restricted or even reversed the LGM DSO intensity. To better constrain these boundary conditions, we present a first reconstruction of the glacial DSO, using four new and four published epibenthic and planktic stable-isotope records from sites to the north and south of the Denmark Strait. The spatial and temporal distribution of epibenthic δ18O and δ13C maxima reveals a north-south density gradient at intermediate water depths from σ0∼28.7 to 28.4/28.1 and suggests that dense and highly ventilated water was convected in the Nordic Seas during the LGM. However, extremely high epibenthic δ13C values on top of the Mid-Atlantic Ridge document a further convection cell of Glacial North Atlantic Intermediate Water to the south of Iceland, which, however, was marked by much lower density (σ0∼28.1) The north-south gradient of water density possibly implied that the glacial DSO was directed to the south like today and fed Glacial North Atlantic Deep Water that has underthrusted the Glacial North Atlantic Intermediate Water in the Irminger Basin. References Boyle, E. A. 1992: Cadmium and δ13C paleochemical ocean distributions during the stage 2 glacial maximum. 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