Enhanced surface melting of the Fennoscandian Ice Sheetduring periods of North Atlantic cooling
International audience Heinrich events (HEs) are dramatic episodes of marine-terminating ice discharge and sediment rafting during periods of cold North Atlantic climate. However, the causal chain of events leading to their occurrence is unresolved. Here, we demonstrate that enhanced surface melting...
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ftinsu:oai:HAL:hal-04202305v1 2024-04-14T08:11:28+00:00 Enhanced surface melting of the Fennoscandian Ice Sheetduring periods of North Atlantic cooling Boswell, Steven M. Toucanne, Samuel Pitel-Roudaut, Mathilde Creyts, Timothy T. Eynaud, Frédérique Bayon, Germain Laboratoire Géodynamique et enregistrement Sédimentaire (LGS) Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2019-07 https://hal.science/hal-04202305 https://doi.org/10.1130/G46370.1 en eng HAL CCSD Geological Society of America info:eu-repo/semantics/altIdentifier/doi/10.1130/G46370.1 hal-04202305 https://hal.science/hal-04202305 doi:10.1130/G46370.1 ISSN: 0091-7613 EISSN: 1943-2682 Geology https://hal.science/hal-04202305 Geology, 2019, 47 (7), pp.664-668. ⟨10.1130/G46370.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.1130/G46370.1 2024-03-21T17:06:29Z International audience Heinrich events (HEs) are dramatic episodes of marine-terminating ice discharge and sediment rafting during periods of cold North Atlantic climate. However, the causal chain of events leading to their occurrence is unresolved. Here, we demonstrate that enhanced surface melting of land-terminating margins of the southern Fennoscandian Ice Sheet (FIS) is a recurring feature of Heinrich stadials (HSs), the cold periods during which HEs occur. We use neodymium isotopes to show that the Channel River transported detrital sediments from the interior of eastern Europe to the Bay of Biscay in the northeast Atlantic Ocean at ca. 158–154 ka. Based on similar evidence from the last glacial period, we infer that this interval corresponds to the melting and retreat of the southern FIS margin despite contemporaneous cooling in the North Atlantic and central Europe. The FIS melting episode occurred just prior to a HE, consistent with findings from the more recent HSs 1, 2, and 3. Based on this evidence, we clarify a sequence of events that precedes HEs. Precursor melting of North Atlantic–adjacent ice sheets induces an initial Atlantic meridional overturning circulation (AMOC) slowdown. Atmospheric changes during the resulting HS cause summertime warming in northern Europe that drives enhanced FIS melting. Subsequent meltwater discharge to the North Atlantic further weakens the AMOC and warms the intermediate water masses that contribute to HEs. Article in Journal/Newspaper Fennoscandian Ice Sheet North Atlantic Northeast Atlantic Institut national des sciences de l'Univers: HAL-INSU Geology 47 7 664 668 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Boswell, Steven M. Toucanne, Samuel Pitel-Roudaut, Mathilde Creyts, Timothy T. Eynaud, Frédérique Bayon, Germain Enhanced surface melting of the Fennoscandian Ice Sheetduring periods of North Atlantic cooling |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Heinrich events (HEs) are dramatic episodes of marine-terminating ice discharge and sediment rafting during periods of cold North Atlantic climate. However, the causal chain of events leading to their occurrence is unresolved. Here, we demonstrate that enhanced surface melting of land-terminating margins of the southern Fennoscandian Ice Sheet (FIS) is a recurring feature of Heinrich stadials (HSs), the cold periods during which HEs occur. We use neodymium isotopes to show that the Channel River transported detrital sediments from the interior of eastern Europe to the Bay of Biscay in the northeast Atlantic Ocean at ca. 158–154 ka. Based on similar evidence from the last glacial period, we infer that this interval corresponds to the melting and retreat of the southern FIS margin despite contemporaneous cooling in the North Atlantic and central Europe. The FIS melting episode occurred just prior to a HE, consistent with findings from the more recent HSs 1, 2, and 3. Based on this evidence, we clarify a sequence of events that precedes HEs. Precursor melting of North Atlantic–adjacent ice sheets induces an initial Atlantic meridional overturning circulation (AMOC) slowdown. Atmospheric changes during the resulting HS cause summertime warming in northern Europe that drives enhanced FIS melting. Subsequent meltwater discharge to the North Atlantic further weakens the AMOC and warms the intermediate water masses that contribute to HEs. |
author2 |
Laboratoire Géodynamique et enregistrement Sédimentaire (LGS) Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Boswell, Steven M. Toucanne, Samuel Pitel-Roudaut, Mathilde Creyts, Timothy T. Eynaud, Frédérique Bayon, Germain |
author_facet |
Boswell, Steven M. Toucanne, Samuel Pitel-Roudaut, Mathilde Creyts, Timothy T. Eynaud, Frédérique Bayon, Germain |
author_sort |
Boswell, Steven M. |
title |
Enhanced surface melting of the Fennoscandian Ice Sheetduring periods of North Atlantic cooling |
title_short |
Enhanced surface melting of the Fennoscandian Ice Sheetduring periods of North Atlantic cooling |
title_full |
Enhanced surface melting of the Fennoscandian Ice Sheetduring periods of North Atlantic cooling |
title_fullStr |
Enhanced surface melting of the Fennoscandian Ice Sheetduring periods of North Atlantic cooling |
title_full_unstemmed |
Enhanced surface melting of the Fennoscandian Ice Sheetduring periods of North Atlantic cooling |
title_sort |
enhanced surface melting of the fennoscandian ice sheetduring periods of north atlantic cooling |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-04202305 https://doi.org/10.1130/G46370.1 |
genre |
Fennoscandian Ice Sheet North Atlantic Northeast Atlantic |
genre_facet |
Fennoscandian Ice Sheet North Atlantic Northeast Atlantic |
op_source |
ISSN: 0091-7613 EISSN: 1943-2682 Geology https://hal.science/hal-04202305 Geology, 2019, 47 (7), pp.664-668. ⟨10.1130/G46370.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/G46370.1 hal-04202305 https://hal.science/hal-04202305 doi:10.1130/G46370.1 |
op_doi |
https://doi.org/10.1130/G46370.1 |
container_title |
Geology |
container_volume |
47 |
container_issue |
7 |
container_start_page |
664 |
op_container_end_page |
668 |
_version_ |
1796309183869485056 |