EMODnet product catalogue
Sedimentological and palynological records since 8.5 ka BP along a proximal-distal gradient on the northern Bay of Biscay (NW Europe)
New results acquired in south-Brittany (MD08-3204 CQ core: Bay of Quiberon and VK03-58bis core: south Glénan islands) allow depicting Holocene paleoenvironmental changes from 8.5 ka BP to present through a multi-proxy dataset including sedimentological and palynological data. First, grain-size analyses and AMS-14C dates highlight a common sedimentary history for both study cores. The relative sea level (RSL) slowdown was accompanied by a significant drop of the sedimentation rates between ca. 8.3 and 5.7 ka BP, after being relatively higher at the onset of the Holocene. This interval led to the establishment of a shell-condensed level, identified in core VK03-58bis by the “Turritella layer” and interpreted as a marker for the maximum flooding surface. Palynological data (pollen grains and dinoflagellate cyst assemblages) acquired in core MD08-3204 CQ argue for an amplification of the fluvial influence since 5.7 ka BP; the establishment of the highstand system tract (i.e., mixed marine and fluviatile influences on the platform) then accompanying the slowdown of the RSL rise-rates. On the shelf, the amplification of Anthropogenic Pollen Indicators (API) is then better detected since 4.2 ka BP, not only due to human impact increase but also due to a stronger fluvial influence on the shelf during the Late Holocene. Palynological data, recorded on the 8.5–8.3 ka BP interval along an inshore-offshore gradient, also demonstrate the complexity of the palynological signal such as i) the fluvial influence that promotes some pollinic taxa (i.e., Corylus, Alnus) from proximal areas and ii) the macro-regionalization of palynomorph sources in distal cores. In addition, the comparison of palynological tracers, including API, over the last 7 kyrs, with south-Brittany coastal and mid-shelf sites subjected to northern vs. southern Loire catchment areas, allowed discussing a major hydro-climatic effect on the reconstructed palynological signals. Strengthened subpolar gyre dynamics (SPG), combined with recurrent positive North Atlantic Oscillation (NAO) configurations, appear responsible for increased winter precipitations and fluvial discharges over northern Europe, such as in Brittany. Conversely, weakened SPG intervals, associated with negative NAO-like modes, are characterized by intensified winter fluvial discharges over southern Europe. Interestingly, we record, at an infra-orbital timescale, major peaks of API during periods of strengthened (/weakened) SPG dynamics in sites subjects to Brittany watersheds (/Loire watersheds) inputs.
Important Note: This submission has been initially submitted to SEA
scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI.
The metadata elements have been further processed (refined) in EMODnet
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- Date (Creation)
- 2022-01-01
- Date (Revision)
- 2022-06-08
- Date (Publication)
- 2023-04-16
- Date (Publication)
- Citation identifier
- a53ad03f-3836-8363-3634-000000086430
- Code
- DOI:10.17882/86430
- Other citation details
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David Ophélie, Penaud Aurélie, Vidal Muriel, Wiem Fersi, Lambert Clément, Goubert Evelyne, Herledan Maiwenn, Stephan Pierre, Pailler Yvan, Bourillet Jean-Francois, Baltzer Agnès (2022). Sedimentological and palynological records since 8.5 ka BP along a proximal-distal gradient on the northern Bay of Biscay (NW Europe). SEANOE. https://doi.org/10.17882/86430
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Organisation name Individual name Electronic mail address Role SEA scieNtific Open data Edition Publisher Ifremer, Scientific Information Systems for the sea Dataset Holding Organisation Ifremer, Scientific Information Systems for the sea Author
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Conditions for access and use apply
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CC-BY 4.0
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- UTF8
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- Oceans
- Begin date
- 2003-10-23
- End date
- 2008-07-24
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- Minimum value
- 20
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- WGS 1984
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Name Version Documents 1
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Protocol Linkage Name WWW:DOWNLOAD-1.0-http--download
https://cloud.emodnet-ingestion.eu/index.php/s/9XcG7ZGfTscUyHy WWW:LINK-1.0-http--link
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- Title
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COMMISSION REGULATION (EC) No 1205/2008 of 3 December 2008 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards metadata
- Date (Publication)
- 2010-12-08
- Explanation
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See the referenced specification
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- No
Conformance result
- Title
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Corrigendum to INSPIRE Metadata Regulation published in the Official Journal of the European Union, L 328, page 83
- Date (Publication)
- 2010-12-08
- Explanation
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See the referenced specification
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Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Date (Publication)
- 2010-12-08
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See the referenced specification
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- No
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Raw data
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- File identifier
- a53ad03f-3836-8363-3634-000000086430 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2025-05-21T00:00:00
- Metadata standard name
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ISO 19115:2003/19139
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1.0
- Metadata author
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Organisation name Individual name Electronic mail address Role Geo-Ocean - UMR 6538 Point of contact
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