Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough margin, NE Atlantic
U‐Th ages and temperatures derived from Li/Mg have been measured on coral fragments of Lophelia pertusa and Madrepora. oculata collected from two sediment cores, which were taken from cold‐water coral (CWC) mounds at 700 ‐ 790 m water depth at the SW Rockall Trough margin. Our data, combined with pr...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://archimer.ifremer.fr/doc/00441/55260/56753.pdf https://doi.org/10.1029/2018GC007502 https://archimer.ifremer.fr/doc/00441/55260/ |
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ftarchimer:oai:archimer.ifremer.fr:55260 2023-05-15T17:08:46+02:00 Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough margin, NE Atlantic Bonneau, Lucile Colin, Christophe Pons-branchu, Edwige Mienis, Furu Tisnerat-laborde, Nadine Blamart, Dominique Elliot, Mary Collart, Tim Frank, Norbert Foliot, Lorna Douville, Eric 2018-08 application/pdf https://archimer.ifremer.fr/doc/00441/55260/56753.pdf https://doi.org/10.1029/2018GC007502 https://archimer.ifremer.fr/doc/00441/55260/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00441/55260/56753.pdf doi:10.1029/2018GC007502 https://archimer.ifremer.fr/doc/00441/55260/ 2018 American Geophysical Union info:eu-repo/semantics/openAccess restricted use Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2018-08 , Vol. 19 , N. 8 , P. 2437-2452 text Publication info:eu-repo/semantics/article 2018 ftarchimer https://doi.org/10.1029/2018GC007502 2021-09-23T20:31:06Z U‐Th ages and temperatures derived from Li/Mg have been measured on coral fragments of Lophelia pertusa and Madrepora. oculata collected from two sediment cores, which were taken from cold‐water coral (CWC) mounds at 700 ‐ 790 m water depth at the SW Rockall Trough margin. Our data, combined with previous published data, have allowed us to firstly estimate the occurrence of CWC at the SW Rockall Trough margin during the Holocene and, secondly, to better constrain the environmental conditions driving variability in CWC growth. CWC abundance is marked by a pronounced increase in the mid‐Holocene (∼6 ka) and is modulated by millennial‐scale variability throughout the late Holocene. The mid‐Holocene proliferation of CWC coincides with lowest IRD abundances and a major re‐organization of the circulation at thermocline depth in the Rockall Trough, marked by the progressive replacement of the fresh‐cold SubArctic Intermediate Water (SAIW) by the saltier and nutrient‐rich Eastern North Atlantic Water (ENAW). This event must have established a modern‐like winter mixed layer and thermocline structure, generating suitable conditions for enhanced surface productivity, downslope transport of food particles, bottom current acceleration at mound depth and thus CWC growth. Several short time intervals of decreased CWC occurrences closely match prominent increases in North Atlantic drift ice and storminess in Northern Europe. We, therefore, propose that high detrital supply and/or changes in the vertical density gradient associated with millennial‐scale ice rafted detritus (IRD) events are the likely controlling factors for CWC growth and subsequent mound formation on the SW Rockall Trough margin. Article in Journal/Newspaper Lophelia pertusa North Atlantic Subarctic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Geochemistry, Geophysics, Geosystems 19 8 2437 2452 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
U‐Th ages and temperatures derived from Li/Mg have been measured on coral fragments of Lophelia pertusa and Madrepora. oculata collected from two sediment cores, which were taken from cold‐water coral (CWC) mounds at 700 ‐ 790 m water depth at the SW Rockall Trough margin. Our data, combined with previous published data, have allowed us to firstly estimate the occurrence of CWC at the SW Rockall Trough margin during the Holocene and, secondly, to better constrain the environmental conditions driving variability in CWC growth. CWC abundance is marked by a pronounced increase in the mid‐Holocene (∼6 ka) and is modulated by millennial‐scale variability throughout the late Holocene. The mid‐Holocene proliferation of CWC coincides with lowest IRD abundances and a major re‐organization of the circulation at thermocline depth in the Rockall Trough, marked by the progressive replacement of the fresh‐cold SubArctic Intermediate Water (SAIW) by the saltier and nutrient‐rich Eastern North Atlantic Water (ENAW). This event must have established a modern‐like winter mixed layer and thermocline structure, generating suitable conditions for enhanced surface productivity, downslope transport of food particles, bottom current acceleration at mound depth and thus CWC growth. Several short time intervals of decreased CWC occurrences closely match prominent increases in North Atlantic drift ice and storminess in Northern Europe. We, therefore, propose that high detrital supply and/or changes in the vertical density gradient associated with millennial‐scale ice rafted detritus (IRD) events are the likely controlling factors for CWC growth and subsequent mound formation on the SW Rockall Trough margin. |
format |
Article in Journal/Newspaper |
author |
Bonneau, Lucile Colin, Christophe Pons-branchu, Edwige Mienis, Furu Tisnerat-laborde, Nadine Blamart, Dominique Elliot, Mary Collart, Tim Frank, Norbert Foliot, Lorna Douville, Eric |
spellingShingle |
Bonneau, Lucile Colin, Christophe Pons-branchu, Edwige Mienis, Furu Tisnerat-laborde, Nadine Blamart, Dominique Elliot, Mary Collart, Tim Frank, Norbert Foliot, Lorna Douville, Eric Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough margin, NE Atlantic |
author_facet |
Bonneau, Lucile Colin, Christophe Pons-branchu, Edwige Mienis, Furu Tisnerat-laborde, Nadine Blamart, Dominique Elliot, Mary Collart, Tim Frank, Norbert Foliot, Lorna Douville, Eric |
author_sort |
Bonneau, Lucile |
title |
Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough margin, NE Atlantic |
title_short |
Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough margin, NE Atlantic |
title_full |
Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough margin, NE Atlantic |
title_fullStr |
Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough margin, NE Atlantic |
title_full_unstemmed |
Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough margin, NE Atlantic |
title_sort |
imprint of holocene climate variability on cold-water coral reef growth at the sw rockall trough margin, ne atlantic |
publisher |
Amer Geophysical Union |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00441/55260/56753.pdf https://doi.org/10.1029/2018GC007502 https://archimer.ifremer.fr/doc/00441/55260/ |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) |
geographic |
Rockall Trough |
geographic_facet |
Rockall Trough |
genre |
Lophelia pertusa North Atlantic Subarctic |
genre_facet |
Lophelia pertusa North Atlantic Subarctic |
op_source |
Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2018-08 , Vol. 19 , N. 8 , P. 2437-2452 |
op_relation |
https://archimer.ifremer.fr/doc/00441/55260/56753.pdf doi:10.1029/2018GC007502 https://archimer.ifremer.fr/doc/00441/55260/ |
op_rights |
2018 American Geophysical Union info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2018GC007502 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
19 |
container_issue |
8 |
container_start_page |
2437 |
op_container_end_page |
2452 |
_version_ |
1766064626377687040 |