Late Pliocene to early Pleistocene changes in the North Atlantic Current and suborbital-scale sea-surface temperature variability
International audience The strength and latitudinal position of the North Atlantic Current, NAC, determines the position of the Arctic front and heat transport to the high northern latitudes with potentially important consequences for Northern Hemisphere glaciation. A southward shift in the NAC and...
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-01667998 https://hal.science/hal-01667998/document https://hal.science/hal-01667998/file/palo.20029.pdf https://doi.org/10.1002/palo.20029 |
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ftunivangershal:oai:HAL:hal-01667998v1 2024-06-23T07:50:23+00:00 Late Pliocene to early Pleistocene changes in the North Atlantic Current and suborbital-scale sea-surface temperature variability Friedrich, Oliver Wilson, Paul A. Bolton, Clara T. Beer, Christopher J. Schiebel, Ralf National Oceanography Centre Southampton (NOC) University of Southampton Goethe-Universität Frankfurt am Main Ruprecht-Karl Universität Heidelberg Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Bio-Indicateurs Actuels et Fossiles (BIAF) Université d'Angers (UA) 2013 https://hal.science/hal-01667998 https://hal.science/hal-01667998/document https://hal.science/hal-01667998/file/palo.20029.pdf https://doi.org/10.1002/palo.20029 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/palo.20029 hal-01667998 https://hal.science/hal-01667998 https://hal.science/hal-01667998/document https://hal.science/hal-01667998/file/palo.20029.pdf doi:10.1002/palo.20029 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01667998 Paleoceanography, 2013, 28 (2), pp.274-282. ⟨10.1002/palo.20029⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology info:eu-repo/semantics/article Journal articles 2013 ftunivangershal https://doi.org/10.1002/palo.20029 2024-06-10T14:07:11Z International audience The strength and latitudinal position of the North Atlantic Current, NAC, determines the position of the Arctic front and heat transport to the high northern latitudes with potentially important consequences for Northern Hemisphere glaciation. A southward shift in the NAC and reduced poleward heat transport is hypothesized to have triggered the last major climate transition in Earth's history—late Pliocene intensification of Northern Hemisphere glaciation (iNHG). In turn, iNHG is hypothesized to have led to the amplification of climate variability on suborbital time scales. To date, however, only a handful of adequately resolved records are available to test these two hypotheses. Here we present a new late Pliocene to earliest Pleistocene record from Integrated Ocean Drilling Program Site U1313 (North Atlantic, 41°N; 2.9 to 2.4 Ma). We use Mg/Ca‐derived paleotemperature records in planktic foraminiferal calcite to investigate changes in summer sea‐surface temperatures (SST) on orbital and suborbital time scales. Our results call into question the suggestion that significant weakening and/or southward shift of the NAC served as a trigger for Northern Hemisphere cooling and intensified continental ice sheet growth across iNHG. In contrast to the late Pleistocene, during iNHG, we find that the position of the NAC and Arctic Front probably lay well to the north of Site U1313 and that the amplitude of suborbital SST variability did not change on glacial‐interglacial time scales. Conservative estimates of Late Pliocene to earliest Pleistocene interglacial summer SSTs in our record are up to 3°C warmer than present, while glacial summer SSTs are only 2°C to 3°C cooler. In fact, our interglacial summer SSTs are remarkably similar to those of the mid‐Pliocene. Our findings indicate that iNHG must have involved amplifying feedback mechanisms that are tightly coupled to ice sheet growth but that these processes were insufficiently developed by the late Pliocene/earliest Pleistocene to have ... Article in Journal/Newspaper Arctic Foraminifera* Ice Sheet north atlantic current North Atlantic Portail des publications scientifiques de l’Université d’Angers (HAL) Arctic Paleoceanography 28 2 274 282 |
institution |
Open Polar |
collection |
Portail des publications scientifiques de l’Université d’Angers (HAL) |
op_collection_id |
ftunivangershal |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology Friedrich, Oliver Wilson, Paul A. Bolton, Clara T. Beer, Christopher J. Schiebel, Ralf Late Pliocene to early Pleistocene changes in the North Atlantic Current and suborbital-scale sea-surface temperature variability |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
description |
International audience The strength and latitudinal position of the North Atlantic Current, NAC, determines the position of the Arctic front and heat transport to the high northern latitudes with potentially important consequences for Northern Hemisphere glaciation. A southward shift in the NAC and reduced poleward heat transport is hypothesized to have triggered the last major climate transition in Earth's history—late Pliocene intensification of Northern Hemisphere glaciation (iNHG). In turn, iNHG is hypothesized to have led to the amplification of climate variability on suborbital time scales. To date, however, only a handful of adequately resolved records are available to test these two hypotheses. Here we present a new late Pliocene to earliest Pleistocene record from Integrated Ocean Drilling Program Site U1313 (North Atlantic, 41°N; 2.9 to 2.4 Ma). We use Mg/Ca‐derived paleotemperature records in planktic foraminiferal calcite to investigate changes in summer sea‐surface temperatures (SST) on orbital and suborbital time scales. Our results call into question the suggestion that significant weakening and/or southward shift of the NAC served as a trigger for Northern Hemisphere cooling and intensified continental ice sheet growth across iNHG. In contrast to the late Pleistocene, during iNHG, we find that the position of the NAC and Arctic Front probably lay well to the north of Site U1313 and that the amplitude of suborbital SST variability did not change on glacial‐interglacial time scales. Conservative estimates of Late Pliocene to earliest Pleistocene interglacial summer SSTs in our record are up to 3°C warmer than present, while glacial summer SSTs are only 2°C to 3°C cooler. In fact, our interglacial summer SSTs are remarkably similar to those of the mid‐Pliocene. Our findings indicate that iNHG must have involved amplifying feedback mechanisms that are tightly coupled to ice sheet growth but that these processes were insufficiently developed by the late Pliocene/earliest Pleistocene to have ... |
author2 |
National Oceanography Centre Southampton (NOC) University of Southampton Goethe-Universität Frankfurt am Main Ruprecht-Karl Universität Heidelberg Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Bio-Indicateurs Actuels et Fossiles (BIAF) Université d'Angers (UA) |
format |
Article in Journal/Newspaper |
author |
Friedrich, Oliver Wilson, Paul A. Bolton, Clara T. Beer, Christopher J. Schiebel, Ralf |
author_facet |
Friedrich, Oliver Wilson, Paul A. Bolton, Clara T. Beer, Christopher J. Schiebel, Ralf |
author_sort |
Friedrich, Oliver |
title |
Late Pliocene to early Pleistocene changes in the North Atlantic Current and suborbital-scale sea-surface temperature variability |
title_short |
Late Pliocene to early Pleistocene changes in the North Atlantic Current and suborbital-scale sea-surface temperature variability |
title_full |
Late Pliocene to early Pleistocene changes in the North Atlantic Current and suborbital-scale sea-surface temperature variability |
title_fullStr |
Late Pliocene to early Pleistocene changes in the North Atlantic Current and suborbital-scale sea-surface temperature variability |
title_full_unstemmed |
Late Pliocene to early Pleistocene changes in the North Atlantic Current and suborbital-scale sea-surface temperature variability |
title_sort |
late pliocene to early pleistocene changes in the north atlantic current and suborbital-scale sea-surface temperature variability |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-01667998 https://hal.science/hal-01667998/document https://hal.science/hal-01667998/file/palo.20029.pdf https://doi.org/10.1002/palo.20029 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Foraminifera* Ice Sheet north atlantic current North Atlantic |
genre_facet |
Arctic Foraminifera* Ice Sheet north atlantic current North Atlantic |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01667998 Paleoceanography, 2013, 28 (2), pp.274-282. ⟨10.1002/palo.20029⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/palo.20029 hal-01667998 https://hal.science/hal-01667998 https://hal.science/hal-01667998/document https://hal.science/hal-01667998/file/palo.20029.pdf doi:10.1002/palo.20029 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/palo.20029 |
container_title |
Paleoceanography |
container_volume |
28 |
container_issue |
2 |
container_start_page |
274 |
op_container_end_page |
282 |
_version_ |
1802641262578237440 |