Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point
This paper documents the evolution over the last 10 kyr of one of the key parameters of climate: sea-surface temperatures (SSTs) in the North Atlantic. We focus on the southern Bay of Biscay, a highly sensitive oceanographic area regarding the dynamics of the North Atlantic subpolar and subtropical...
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ftarchimer:oai:archimer.ifremer.fr:53177 2023-05-15T17:25:19+02:00 Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point Mary, Yannick Eynaud, Frederique Colin, Christophe Rossignol, Linda Brocheray, Sandra Mojtahid, Meryem Garcia, Jennifer Peral, Marion Howa, Helene Zaragosi, Sebastien Cremer, Michel 2017-03 application/pdf https://archimer.ifremer.fr/doc/00420/53177/55077.pdf https://archimer.ifremer.fr/doc/00420/53177/55078.pdf https://doi.org/10.5194/cp-13-201-2017 https://archimer.ifremer.fr/doc/00420/53177/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00420/53177/55077.pdf https://archimer.ifremer.fr/doc/00420/53177/55078.pdf doi:10.5194/cp-13-201-2017 https://archimer.ifremer.fr/doc/00420/53177/ Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2017-03 , Vol. 13 , P. 201-216 text Publication info:eu-repo/semantics/article 2017 ftarchimer https://doi.org/10.5194/cp-13-201-2017 2021-09-23T20:30:24Z This paper documents the evolution over the last 10 kyr of one of the key parameters of climate: sea-surface temperatures (SSTs) in the North Atlantic. We focus on the southern Bay of Biscay, a highly sensitive oceanographic area regarding the dynamics of the North Atlantic subpolar and subtropical gyres (SPG and STG respectively). This site furthermore offers unique sedimentary environments characterized by exceptional accumulation rates, enabling the study of Holocene archives at (infra) centennial scales. Our results mainly derive from planktonic foraminiferal association analysis on two cores from the southern Landes Plateau. These associations are used as the basis of modern analogue technique transfer functions to track past hydrographical changes. SST reconstructions were thus obtained at an exceptional resolution and compared to a compilation of Holocene records from the northeastern North Atlantic. From this regional perspective are shown fundamental timing differences between the gyre dynamics, nuancing classical views of a simple meridional overturning cell. Our study highlights that western Europe underwent significant oscillations of (annual) SST during the last 10 kyr. During well-known intervals of mild boreal climate, warm shifts of more than 3 ffi C per century are accurately concomitant with positive sea-surface temperature anomalies and rise of micropalaeontological indicators of gyre dynamics in the northern North Atlantic, pointing to periods of greater intensity of the North Atlantic Current (SPG cell especially). Conversely, the SST signal records short-term cold anomalies which could be related to weaker SPG dynamics. Article in Journal/Newspaper north atlantic current North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Climate of the Past 13 3 201 216 |
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 |
This paper documents the evolution over the last 10 kyr of one of the key parameters of climate: sea-surface temperatures (SSTs) in the North Atlantic. We focus on the southern Bay of Biscay, a highly sensitive oceanographic area regarding the dynamics of the North Atlantic subpolar and subtropical gyres (SPG and STG respectively). This site furthermore offers unique sedimentary environments characterized by exceptional accumulation rates, enabling the study of Holocene archives at (infra) centennial scales. Our results mainly derive from planktonic foraminiferal association analysis on two cores from the southern Landes Plateau. These associations are used as the basis of modern analogue technique transfer functions to track past hydrographical changes. SST reconstructions were thus obtained at an exceptional resolution and compared to a compilation of Holocene records from the northeastern North Atlantic. From this regional perspective are shown fundamental timing differences between the gyre dynamics, nuancing classical views of a simple meridional overturning cell. Our study highlights that western Europe underwent significant oscillations of (annual) SST during the last 10 kyr. During well-known intervals of mild boreal climate, warm shifts of more than 3 ffi C per century are accurately concomitant with positive sea-surface temperature anomalies and rise of micropalaeontological indicators of gyre dynamics in the northern North Atlantic, pointing to periods of greater intensity of the North Atlantic Current (SPG cell especially). Conversely, the SST signal records short-term cold anomalies which could be related to weaker SPG dynamics. |
format |
Article in Journal/Newspaper |
author |
Mary, Yannick Eynaud, Frederique Colin, Christophe Rossignol, Linda Brocheray, Sandra Mojtahid, Meryem Garcia, Jennifer Peral, Marion Howa, Helene Zaragosi, Sebastien Cremer, Michel |
spellingShingle |
Mary, Yannick Eynaud, Frederique Colin, Christophe Rossignol, Linda Brocheray, Sandra Mojtahid, Meryem Garcia, Jennifer Peral, Marion Howa, Helene Zaragosi, Sebastien Cremer, Michel Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point |
author_facet |
Mary, Yannick Eynaud, Frederique Colin, Christophe Rossignol, Linda Brocheray, Sandra Mojtahid, Meryem Garcia, Jennifer Peral, Marion Howa, Helene Zaragosi, Sebastien Cremer, Michel |
author_sort |
Mary, Yannick |
title |
Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point |
title_short |
Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point |
title_full |
Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point |
title_fullStr |
Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point |
title_full_unstemmed |
Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point |
title_sort |
changes in holocene meridional circulation and poleward atlantic flow: the bay of biscay as a nodal point |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2017 |
url |
https://archimer.ifremer.fr/doc/00420/53177/55077.pdf https://archimer.ifremer.fr/doc/00420/53177/55078.pdf https://doi.org/10.5194/cp-13-201-2017 https://archimer.ifremer.fr/doc/00420/53177/ |
genre |
north atlantic current North Atlantic |
genre_facet |
north atlantic current North Atlantic |
op_source |
Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2017-03 , Vol. 13 , P. 201-216 |
op_relation |
https://archimer.ifremer.fr/doc/00420/53177/55077.pdf https://archimer.ifremer.fr/doc/00420/53177/55078.pdf doi:10.5194/cp-13-201-2017 https://archimer.ifremer.fr/doc/00420/53177/ |
op_rights |
Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-13-201-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
3 |
container_start_page |
201 |
op_container_end_page |
216 |
_version_ |
1766116704718422016 |