Consulta: subjectFacets:"Speleothems"
Registros recuperados: 3
Data/hora: 15/06/2024 21:36:09

Sequence of events from the onset to the demise of the Last Interglacial: Evaluating strengths and limitations of chronologies used in climatic archives
Provedor de dados: 5
Autores: Govin, A.; Capron, E.; Tzedakis, P. C.; Verheyden, S.; Ghaleb, B.; Hillaire-marcel, C.; St-onge, G.; Stoner, J. S.; Bassinot, F.; Bazin, L.; Blunier, T.; Combourieu-nebout, N.; El Ouahabi, A.; Genty, D.; Gersonde, R.; Jimenez-amat, P.; Landais, A.; Martrat, B.; Masson-delmotte, V.; Parrenin, F.; Seidenkrantz, M. -s.; Veres, D.; Waelbroeck, C.; Zahn, R.
The Last Interglacial (LIG) represents an invaluable case study to investigate the response of components of the Earth system to global warming. However, the scarcity of absolute age constraints in most archives leads to extensive use of various stratigraphic alignments to different reference chronologies. This feature sets limitations to the accuracy of the stratigraphic assignment of the climatic sequence of events across the globe during the LIG. Here, we review the strengths and limitations of the methods that are commonly used to date or develop chronologies in various climatic archives for the time span (similar to 140 -100 ka) encompassing the penultimate deglaciation, the LIG and the glacial inception. Climatic hypotheses underlying record...
Tipo: Text
Palavras-chave: Last Interglacial; Penultimate deglaciation; Last glacial inception; Chronology; Corals; Speleothems; Ice cores; Marine sediments; Peat and lake sediments; Climate dynamics.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00496/60802/64786.pdf

Episodic speleothem deposition tracks the terrestrial impact of millennial-scale last glacial climate variability in SW Ireland
Provedor de dados: 5
Autores: Fankhauser, Adelheid; Mcdermott, Frank; Fleitmann, Dominik.
Eighty four new U-Th ages are presented for twenty randomly selected broken, displaced and reworked calcite speleothems retrieved from clastic sedimentary fill and from isolated bedding-plane shelves in Crag cave (SW Ireland). The dated pre-Holocene samples span much of the last glacial, ranging in age from 85.15 +/- 0.60 to 23.45 +/- 0.17 ka. Speleothem deposition requires the presence of liquid water, and because Crag cave is a shallow system, deposition is considered likely only when mean annual air temperatures (MAAT) exceed the freezing point of water. Deposition at this mid-latitude ocean-marginal site occurred episodically during MIS5a through to MIS2, synchronously within dating uncertainties, with the timing of Greenland Interstadials (GI). In the...
Tipo: Text
Palavras-chave: Speleothems; Last glacial cycle; Greenland Interstadials; NGRIP chronology.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00421/53211/83358.pdf

Rapid climatic changes of the last 90 kyr recorded on the European continent
Provedor de dados: 5
Autores: Genty, D; Combourieu Nebout, N; Hatte, C; Blamart, D; Ghaleb, B; Isabello, L.
Millennial-scale events of the last glacial period (Dansgaard-Oeschger events (D/O)). characterized by great temperature changes in the ice core records, have also influenced the vegetation and the climate of the l:European continent. Three types of continental archives - the loess deposits, the pollen assemblage record of a continental margin core and speleothems - spread on western Europe along a SW-NE profile, give information about the humidity. temperature and vegetation changes that were due to these millennial scale climatic changes.
Tipo: Text
Palavras-chave: Dansgaard/Oeschger; Végétation méditerranéenne; Loess; Spéléothèmes; Europe; Dansgaard/Oeschger; Mediterranean vegetation; Loess; Speleothems; Europe.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/00232/34327/32730.pdf