Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘ La Grande Vasière ’ mid-shelf mud belt
A mid- to late-Holocene paleohydrological reconstruction from the northeast Atlantic is proposed through the study of a high-resolution sedimentary record from the northern continental shelf of the Bay of Biscay (BoB). Three foraminiferal species dominate the assemblages with Rosalina globularis sho...
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Language: | English |
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SAGE Publications
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Online Access: | https://archimer.ifremer.fr/doc/00471/58300/60820.pdf https://archimer.ifremer.fr/doc/00471/58300/60821.pdf https://doi.org/10.1177/0959683618816478 https://archimer.ifremer.fr/doc/00471/58300/ |
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ftarchimer:oai:archimer.ifremer.fr:58300 2023-05-15T17:35:24+02:00 Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘ La Grande Vasière ’ mid-shelf mud belt Mojtahid, Meryem Durand, Matthieu Coste, Pierre-olivier Toucanne, Samuel Howa, Hélène Nizou, Jean Eynaud, Frédérique Penaud, Aurélie 2019-03 application/pdf https://archimer.ifremer.fr/doc/00471/58300/60820.pdf https://archimer.ifremer.fr/doc/00471/58300/60821.pdf https://doi.org/10.1177/0959683618816478 https://archimer.ifremer.fr/doc/00471/58300/ eng eng SAGE Publications https://archimer.ifremer.fr/doc/00471/58300/60820.pdf https://archimer.ifremer.fr/doc/00471/58300/60821.pdf doi:10.1177/0959683618816478 https://archimer.ifremer.fr/doc/00471/58300/ info:eu-repo/semantics/openAccess restricted use Holocene (0959-6836) (SAGE Publications), 2019-03 , Vol. 29 , N. 3 , P. 467-480 AMOC Bay of Biscay benthic foraminifera NAO-like process river runoff stable isotopes text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1177/0959683618816478 2021-09-23T20:31:56Z A mid- to late-Holocene paleohydrological reconstruction from the northeast Atlantic is proposed through the study of a high-resolution sedimentary record from the northern continental shelf of the Bay of Biscay (BoB). Three foraminiferal species dominate the assemblages with Rosalina globularis showing an overall decrease in absolute and relative abundances from ~7 to 0.4 cal. ka BP, whereas the opposite trend is observed for Cibicides refulgens and Lobatula. These long-term patterns are interpreted as a response to the overall cooling trend and/or the progressive deepening of the water column because of the relative sea-level (RSL) rise. Foraminiferal δ18O and grain-size analyses show a significant shift around 3.5–2.5 cal. ka BP toward a heavier isotopic signature and finer sediments. We mainly link this change to enhanced contribution of continental freshwaters and fine sediments after the near-stabilization of the RSL rise. By reducing coastal accommodation spaces, this led to a better channelization of river outflows and probably to the formation of the modern winter thermohaline front. Superimposed on these long-term patterns, our data highlight strong millennial-scale variability (1250-year peak). Such cyclicity is consistent with several records tracing changes in rainfall and storminess regimes in northern Europe, and the dynamics of the subpolar gyre (SPG). We suggest a millennial time-scale control of a NAO-like (North Atlantic Oscillation) climatic process modulating continental humidity (and the associated river discharges) and SPG dynamics through wind stress. Spectral analyses reveal an additional 500-year frequency peak implying a possible solar forcing. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Northeast Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) The Holocene 29 3 467 480 |
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 |
topic |
AMOC Bay of Biscay benthic foraminifera NAO-like process river runoff stable isotopes |
spellingShingle |
AMOC Bay of Biscay benthic foraminifera NAO-like process river runoff stable isotopes Mojtahid, Meryem Durand, Matthieu Coste, Pierre-olivier Toucanne, Samuel Howa, Hélène Nizou, Jean Eynaud, Frédérique Penaud, Aurélie Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘ La Grande Vasière ’ mid-shelf mud belt |
topic_facet |
AMOC Bay of Biscay benthic foraminifera NAO-like process river runoff stable isotopes |
description |
A mid- to late-Holocene paleohydrological reconstruction from the northeast Atlantic is proposed through the study of a high-resolution sedimentary record from the northern continental shelf of the Bay of Biscay (BoB). Three foraminiferal species dominate the assemblages with Rosalina globularis showing an overall decrease in absolute and relative abundances from ~7 to 0.4 cal. ka BP, whereas the opposite trend is observed for Cibicides refulgens and Lobatula. These long-term patterns are interpreted as a response to the overall cooling trend and/or the progressive deepening of the water column because of the relative sea-level (RSL) rise. Foraminiferal δ18O and grain-size analyses show a significant shift around 3.5–2.5 cal. ka BP toward a heavier isotopic signature and finer sediments. We mainly link this change to enhanced contribution of continental freshwaters and fine sediments after the near-stabilization of the RSL rise. By reducing coastal accommodation spaces, this led to a better channelization of river outflows and probably to the formation of the modern winter thermohaline front. Superimposed on these long-term patterns, our data highlight strong millennial-scale variability (1250-year peak). Such cyclicity is consistent with several records tracing changes in rainfall and storminess regimes in northern Europe, and the dynamics of the subpolar gyre (SPG). We suggest a millennial time-scale control of a NAO-like (North Atlantic Oscillation) climatic process modulating continental humidity (and the associated river discharges) and SPG dynamics through wind stress. Spectral analyses reveal an additional 500-year frequency peak implying a possible solar forcing. |
format |
Article in Journal/Newspaper |
author |
Mojtahid, Meryem Durand, Matthieu Coste, Pierre-olivier Toucanne, Samuel Howa, Hélène Nizou, Jean Eynaud, Frédérique Penaud, Aurélie |
author_facet |
Mojtahid, Meryem Durand, Matthieu Coste, Pierre-olivier Toucanne, Samuel Howa, Hélène Nizou, Jean Eynaud, Frédérique Penaud, Aurélie |
author_sort |
Mojtahid, Meryem |
title |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘ La Grande Vasière ’ mid-shelf mud belt |
title_short |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘ La Grande Vasière ’ mid-shelf mud belt |
title_full |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘ La Grande Vasière ’ mid-shelf mud belt |
title_fullStr |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘ La Grande Vasière ’ mid-shelf mud belt |
title_full_unstemmed |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘ La Grande Vasière ’ mid-shelf mud belt |
title_sort |
millennial-scale holocene hydrological changes in the northeast atlantic: new insights from ‘ la grande vasière ’ mid-shelf mud belt |
publisher |
SAGE Publications |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00471/58300/60820.pdf https://archimer.ifremer.fr/doc/00471/58300/60821.pdf https://doi.org/10.1177/0959683618816478 https://archimer.ifremer.fr/doc/00471/58300/ |
genre |
North Atlantic North Atlantic oscillation Northeast Atlantic |
genre_facet |
North Atlantic North Atlantic oscillation Northeast Atlantic |
op_source |
Holocene (0959-6836) (SAGE Publications), 2019-03 , Vol. 29 , N. 3 , P. 467-480 |
op_relation |
https://archimer.ifremer.fr/doc/00471/58300/60820.pdf https://archimer.ifremer.fr/doc/00471/58300/60821.pdf doi:10.1177/0959683618816478 https://archimer.ifremer.fr/doc/00471/58300/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1177/0959683618816478 |
container_title |
The Holocene |
container_volume |
29 |
container_issue |
3 |
container_start_page |
467 |
op_container_end_page |
480 |
_version_ |
1766134569598189568 |