Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin)
International audience Turbulent bottom currents significantly influence the formation of cold-water coral mounds and sedimentation processes on continental slopes. Combining records from coral mounds and adjacent slope sediments therefore provide an unprecedented palaeo-archive to understand past v...
Published in: | Quaternary Science Reviews |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02971186 https://hal.archives-ouvertes.fr/hal-02971186/document https://hal.archives-ouvertes.fr/hal-02971186/file/1-s2.0-S0277379120302729-main.pdf https://doi.org/10.1016/j.quascirev.2020.106310 |
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ftunivnantes:oai:HAL:hal-02971186v1 |
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record_format |
openpolar |
institution |
Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Wienberg, Claudia Titschack, Jürgen Frank, Norbert de Pol-Holz, Ricardo Fietzke, Jan Eisele, Markus Kremer, Anne Hebbeln, Dierk Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin) |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Turbulent bottom currents significantly influence the formation of cold-water coral mounds and sedimentation processes on continental slopes. Combining records from coral mounds and adjacent slope sediments therefore provide an unprecedented palaeo-archive to understand past variations of intermediate water-mass dynamics. Here, we present coral ages from coral mounds of the Belgica province (Porcupine Seabight, NE Atlantic), which indicate a non-synchronous Holocene re-activation in mound formation suggested by a temporal offset of~2.7 kyr between the deep (start:~11.3 ka BP at 950 m depth) and shallow (start:~8.6 ka BP at 700 m depth) mounds. A similar depth-dependent pattern is revealed in the slope sediments close to these mounds that become progressively younger from 22.1 ka BP at 990 m to 12.2 ka BP at 740 m depth (based on core-top ages). We suggest that the observed changes are the consequence of enhanced bottom-water hydrodynamics, caused by internal waves associated to the reinvigoration of the Mediterranean Outflow Water (MOW) and the development of a transition zone (TZ) between the MOW and the overlying Eastern North Atlantic Water (ENAW), which established during the last deglacial. These highly energetic conditions induced erosion adjacent to the Belgica mounds and supported the re-initiation of mound formation by increasing food and sediment fluxes. The striking depth-dependent patterns are likely linked to a shift of the ENAW-MOW-TZ, moving the level of maximum energy~250 m upslope since the onset of the last deglaciation. |
author2 |
Center for Marine Environmental Sciences Bremen (MARUM) Universität Bremen Institute of Environmental Physics Heidelberg (IUP) Universität Heidelberg Heidelberg Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géochrononologie Traceurs Archéométrie (GEOTRAC) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) GAIA-Antártica Universidad de Magallanes (UMAG) Helmholtz Centre for Ocean Research Kiel (GEOMAR) |
format |
Article in Journal/Newspaper |
author |
Wienberg, Claudia Titschack, Jürgen Frank, Norbert de Pol-Holz, Ricardo Fietzke, Jan Eisele, Markus Kremer, Anne Hebbeln, Dierk |
author_facet |
Wienberg, Claudia Titschack, Jürgen Frank, Norbert de Pol-Holz, Ricardo Fietzke, Jan Eisele, Markus Kremer, Anne Hebbeln, Dierk |
author_sort |
Wienberg, Claudia |
title |
Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin) |
title_short |
Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin) |
title_full |
Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin) |
title_fullStr |
Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin) |
title_full_unstemmed |
Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin) |
title_sort |
deglacial upslope shift of ne atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (porcupine seabight, irish margin) |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-02971186 https://hal.archives-ouvertes.fr/hal-02971186/document https://hal.archives-ouvertes.fr/hal-02971186/file/1-s2.0-S0277379120302729-main.pdf https://doi.org/10.1016/j.quascirev.2020.106310 |
long_lat |
ENVELOPE(-13.000,-13.000,50.500,50.500) |
geographic |
Porcupine Seabight |
geographic_facet |
Porcupine Seabight |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0277-3791 Quaternary Science Reviews https://hal.archives-ouvertes.fr/hal-02971186 Quaternary Science Reviews, Elsevier, 2020, 237, pp.106310. ⟨10.1016/j.quascirev.2020.106310⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106310 hal-02971186 https://hal.archives-ouvertes.fr/hal-02971186 https://hal.archives-ouvertes.fr/hal-02971186/document https://hal.archives-ouvertes.fr/hal-02971186/file/1-s2.0-S0277379120302729-main.pdf doi:10.1016/j.quascirev.2020.106310 |
op_rights |
http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess |
op_rightsnorm |
CC-BY-ND |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106310 |
container_title |
Quaternary Science Reviews |
container_volume |
237 |
container_start_page |
106310 |
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1766134721915387904 |
spelling |
ftunivnantes:oai:HAL:hal-02971186v1 2023-05-15T17:35:32+02:00 Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight, Irish margin) Wienberg, Claudia Titschack, Jürgen Frank, Norbert de Pol-Holz, Ricardo Fietzke, Jan Eisele, Markus Kremer, Anne Hebbeln, Dierk Center for Marine Environmental Sciences Bremen (MARUM) Universität Bremen Institute of Environmental Physics Heidelberg (IUP) Universität Heidelberg Heidelberg Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géochrononologie Traceurs Archéométrie (GEOTRAC) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) GAIA-Antártica Universidad de Magallanes (UMAG) Helmholtz Centre for Ocean Research Kiel (GEOMAR) 2020-06 https://hal.archives-ouvertes.fr/hal-02971186 https://hal.archives-ouvertes.fr/hal-02971186/document https://hal.archives-ouvertes.fr/hal-02971186/file/1-s2.0-S0277379120302729-main.pdf https://doi.org/10.1016/j.quascirev.2020.106310 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106310 hal-02971186 https://hal.archives-ouvertes.fr/hal-02971186 https://hal.archives-ouvertes.fr/hal-02971186/document https://hal.archives-ouvertes.fr/hal-02971186/file/1-s2.0-S0277379120302729-main.pdf doi:10.1016/j.quascirev.2020.106310 http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess CC-BY-ND ISSN: 0277-3791 Quaternary Science Reviews https://hal.archives-ouvertes.fr/hal-02971186 Quaternary Science Reviews, Elsevier, 2020, 237, pp.106310. ⟨10.1016/j.quascirev.2020.106310⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2020 ftunivnantes https://doi.org/10.1016/j.quascirev.2020.106310 2022-10-18T23:32:53Z International audience Turbulent bottom currents significantly influence the formation of cold-water coral mounds and sedimentation processes on continental slopes. Combining records from coral mounds and adjacent slope sediments therefore provide an unprecedented palaeo-archive to understand past variations of intermediate water-mass dynamics. Here, we present coral ages from coral mounds of the Belgica province (Porcupine Seabight, NE Atlantic), which indicate a non-synchronous Holocene re-activation in mound formation suggested by a temporal offset of~2.7 kyr between the deep (start:~11.3 ka BP at 950 m depth) and shallow (start:~8.6 ka BP at 700 m depth) mounds. A similar depth-dependent pattern is revealed in the slope sediments close to these mounds that become progressively younger from 22.1 ka BP at 990 m to 12.2 ka BP at 740 m depth (based on core-top ages). We suggest that the observed changes are the consequence of enhanced bottom-water hydrodynamics, caused by internal waves associated to the reinvigoration of the Mediterranean Outflow Water (MOW) and the development of a transition zone (TZ) between the MOW and the overlying Eastern North Atlantic Water (ENAW), which established during the last deglacial. These highly energetic conditions induced erosion adjacent to the Belgica mounds and supported the re-initiation of mound formation by increasing food and sediment fluxes. The striking depth-dependent patterns are likely linked to a shift of the ENAW-MOW-TZ, moving the level of maximum energy~250 m upslope since the onset of the last deglaciation. Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES Porcupine Seabight ENVELOPE(-13.000,-13.000,50.500,50.500) Quaternary Science Reviews 237 106310 |