Sea-level change along the French Atlantic and Channel coasts since the time of the Last Glacial Maximum
Identifieur interne : 001D09 ( Main/Exploration ); précédent : 001D08; suivant : 001D10Sea-level change along the French Atlantic and Channel coasts since the time of the Last Glacial Maximum
Auteurs : Kurt Lambeck [Australie]Source :
- Palaeogeography, Palaeoclimatology, Palaeoecology [ 0031-0182 ] ; 1997.
Abstract
Holocene sea-level change along the French Atlantic and English Channel coast is not uniform because of the response of the crust to the changing ice and water loads in Late Pleistocene and Holocene time. The pattern of the spatial variability is a north-south trend, of decreasing sea levels levels at any time. This results primarily from the isostatic response to the melting of the Fennoscandian ice sheet. Superimposed upon this is a mainly east-west trend resulting from the isostatic response of the crust to the addition of the meltwater into the Atlantic ocean. The combined effect is that at any time sea levels vary spatially along this coastline by amounts that are predicted to reach 20 m from the time of the Last Glacial Maximum to about 10,000 radiocarbon yr ago, about 15 m at 8000 yr ago and about 10 m at 6000 yr ago. Thus observations of past sea levels should not be combined into a single sea-level curve unless first corrected for the glacio-hydro-isostatic factors. Alternatively, the data should only be used to construct regional curves for relatively short sections of the coastline, such as Pas-de-Calais and Picardie, Normandie, Côtes-du-Nord, Finistère, or the Vendée and Charente-Maritime region. Even within such constrained regions the spatial variability may still be of the order of a few meters. Analysis of the observational data by region indicates that major oscillations in sea level are unlikely to have occurred, that levels at no location exceeded the present mean sea level, and that there may have been a small (∼ 3 m) increase in eustatic sea level over the past 6000 yr. Palaeoshorelines and palaeo-water depths for the English Channel and the Atlantic coast shelf have been predicted using the isostatic and eustatic models and the results indicate that in-situ marine deposits older than 6000–7000 yr are unlikely to be found along many sections of the present coastline.
Url:
DOI: 10.1016/S0031-0182(96)00061-2
Affiliations:
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The pattern of the spatial variability is a north-south trend, of decreasing sea levels levels at any time. This results primarily from the isostatic response to the melting of the Fennoscandian ice sheet. Superimposed upon this is a mainly east-west trend resulting from the isostatic response of the crust to the addition of the meltwater into the Atlantic ocean. The combined effect is that at any time sea levels vary spatially along this coastline by amounts that are predicted to reach 20 m from the time of the Last Glacial Maximum to about 10,000 radiocarbon yr ago, about 15 m at 8000 yr ago and about 10 m at 6000 yr ago. Thus observations of past sea levels should not be combined into a single sea-level curve unless first corrected for the glacio-hydro-isostatic factors. Alternatively, the data should only be used to construct regional curves for relatively short sections of the coastline, such as Pas-de-Calais and Picardie, Normandie, Côtes-du-Nord, Finistère, or the Vendée and Charente-Maritime region. Even within such constrained regions the spatial variability may still be of the order of a few meters. Analysis of the observational data by region indicates that major oscillations in sea level are unlikely to have occurred, that levels at no location exceeded the present mean sea level, and that there may have been a small (∼ 3 m) increase in eustatic sea level over the past 6000 yr. Palaeoshorelines and palaeo-water depths for the English Channel and the Atlantic coast shelf have been predicted using the isostatic and eustatic models and the results indicate that in-situ marine deposits older than 6000–7000 yr are unlikely to be found along many sections of the present coastline.</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Lambeck, Kurt" sort="Lambeck, Kurt" uniqKey="Lambeck K" first="Kurt" last="Lambeck">Kurt Lambeck</name></noRegion><name sortKey="Lambeck, Kurt" sort="Lambeck, Kurt" uniqKey="Lambeck K" first="Kurt" last="Lambeck">Kurt Lambeck</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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