Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e)
Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 27 (2012): PA2207, doi:10.1029/2011PA002244. At the peak of the previous inte...
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Online Access: | https://hdl.handle.net/1912/5222 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5222 2023-05-15T16:03:55+02:00 Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e) Irvalı, Nil Ninnemann, Ulysses S. Galaasen, Eirik V. Rosenthal, Yair Kroon, Dick Oppo, Delia W. Kleiven, Helga F. Darling, Kate F. Kissel, Catherine 2012-05-12 application/pdf https://hdl.handle.net/1912/5222 en_US eng American Geophysical Union https://doi.org/10.1029/2011PA002244 Paleoceanography 27 (2012): PA2207 https://hdl.handle.net/1912/5222 doi:10.1029/2011PA002244 Paleoceanography 27 (2012): PA2207 doi:10.1029/2011PA002244 Eirik Drift MIS 5e North Atlantic Last interglacial Multiproxy Article 2012 ftwhoas https://doi.org/10.1029/2011PA002244 2022-05-28T22:58:36Z Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 27 (2012): PA2207, doi:10.1029/2011PA002244. At the peak of the previous interglacial period, North Atlantic and subpolar climate shared many features in common with projections of our future climate, including warmer-than-present conditions and a diminished Greenland Ice Sheet (GIS). Here we portray changes in North Atlantic hydrography linked with Greenland climate during Marine Isotope Stage (MIS) 5e using (sub)centennially sampled records of planktonic foraminiferal isotopes and assemblage counts and ice-rafted debris counts, as well as modern analog technique and Mg/Ca-based paleothermometry. We use the core MD03-2664 recovered from a high accumulation rate site (∼34 cm/kyr) on the Eirik sediment drift (57°26.34′N, 48°36.35′W). The results indicate that surface waters off southern Greenland were ∼3–5°C warmer than today during early MIS 5e. These anomalously warm sea surface temperatures (SSTs) prevailed until the isotopic peak of MIS 5e when they were interrupted by a cooling event beginning at ∼126 kyr BP. This interglacial cooling event is followed by a gradual warming with SSTs subsequently plateauing just below early MIS 5e values. A planktonic δ18O minimum during the cooling event indicates that marked freshening of the surface waters accompanied the cooling. We suggest that switches in the subpolar gyre hydrography occurred during a warmer climate, involving regional changes in freshwater fluxes/balance and East Greenland Current influence in the study area. The nature of these hydrographic transitions suggests that they are most likely related to large-scale circulation dynamics, potentially amplified by GIS meltwater influences. This work is a contribution of the European Science Foundation EuroMARC program, through the AMOCINT project, funded through grants from the Research ... Article in Journal/Newspaper East Greenland east greenland current Greenland Ice Sheet North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Greenland Paleoceanography 27 2 n/a n/a |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Eirik Drift MIS 5e North Atlantic Last interglacial Multiproxy |
spellingShingle |
Eirik Drift MIS 5e North Atlantic Last interglacial Multiproxy Irvalı, Nil Ninnemann, Ulysses S. Galaasen, Eirik V. Rosenthal, Yair Kroon, Dick Oppo, Delia W. Kleiven, Helga F. Darling, Kate F. Kissel, Catherine Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e) |
topic_facet |
Eirik Drift MIS 5e North Atlantic Last interglacial Multiproxy |
description |
Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 27 (2012): PA2207, doi:10.1029/2011PA002244. At the peak of the previous interglacial period, North Atlantic and subpolar climate shared many features in common with projections of our future climate, including warmer-than-present conditions and a diminished Greenland Ice Sheet (GIS). Here we portray changes in North Atlantic hydrography linked with Greenland climate during Marine Isotope Stage (MIS) 5e using (sub)centennially sampled records of planktonic foraminiferal isotopes and assemblage counts and ice-rafted debris counts, as well as modern analog technique and Mg/Ca-based paleothermometry. We use the core MD03-2664 recovered from a high accumulation rate site (∼34 cm/kyr) on the Eirik sediment drift (57°26.34′N, 48°36.35′W). The results indicate that surface waters off southern Greenland were ∼3–5°C warmer than today during early MIS 5e. These anomalously warm sea surface temperatures (SSTs) prevailed until the isotopic peak of MIS 5e when they were interrupted by a cooling event beginning at ∼126 kyr BP. This interglacial cooling event is followed by a gradual warming with SSTs subsequently plateauing just below early MIS 5e values. A planktonic δ18O minimum during the cooling event indicates that marked freshening of the surface waters accompanied the cooling. We suggest that switches in the subpolar gyre hydrography occurred during a warmer climate, involving regional changes in freshwater fluxes/balance and East Greenland Current influence in the study area. The nature of these hydrographic transitions suggests that they are most likely related to large-scale circulation dynamics, potentially amplified by GIS meltwater influences. This work is a contribution of the European Science Foundation EuroMARC program, through the AMOCINT project, funded through grants from the Research ... |
format |
Article in Journal/Newspaper |
author |
Irvalı, Nil Ninnemann, Ulysses S. Galaasen, Eirik V. Rosenthal, Yair Kroon, Dick Oppo, Delia W. Kleiven, Helga F. Darling, Kate F. Kissel, Catherine |
author_facet |
Irvalı, Nil Ninnemann, Ulysses S. Galaasen, Eirik V. Rosenthal, Yair Kroon, Dick Oppo, Delia W. Kleiven, Helga F. Darling, Kate F. Kissel, Catherine |
author_sort |
Irvalı, Nil |
title |
Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e) |
title_short |
Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e) |
title_full |
Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e) |
title_fullStr |
Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e) |
title_full_unstemmed |
Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e) |
title_sort |
rapid switches in subpolar north atlantic hydrography and climate during the last interglacial (mis 5e) |
publisher |
American Geophysical Union |
publishDate |
2012 |
url |
https://hdl.handle.net/1912/5222 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland east greenland current Greenland Ice Sheet North Atlantic |
genre_facet |
East Greenland east greenland current Greenland Ice Sheet North Atlantic |
op_source |
Paleoceanography 27 (2012): PA2207 doi:10.1029/2011PA002244 |
op_relation |
https://doi.org/10.1029/2011PA002244 Paleoceanography 27 (2012): PA2207 https://hdl.handle.net/1912/5222 doi:10.1029/2011PA002244 |
op_doi |
https://doi.org/10.1029/2011PA002244 |
container_title |
Paleoceanography |
container_volume |
27 |
container_issue |
2 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766399608884297728 |