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- W2008292023 abstract "Les mesures isotopiques des glaces polaires montrent une succession de réchauffements rapides pendant la dernière période glaciaire au Groenland. Cette méthode sous-estime l'amplitude des variations de température. Une nouvelle méthode, basée sur la diffusion thermique des gaz dans le névé, permet de quantifier les variations de température de surface grâce aux fractionnements isotopiques associés. Notre méthode d'extraction de l'air de la glace et de mesure spectrométrique permet d'obtenir des précisions de 0,006 et de 0,020‰ pour δ15N et δ40Ar. Cette technique a permis d'estimer à 16±1,5 °C la variation de température de surface lors d'un événement climatique rapide (−70000 ans). Pour citer cet article : A. Landais et al., C. R. Geoscience 336 (2004). Isotopic measurements in polar ice core have shown a succession of rapid warming periods during the last glacial period over Greenland. However, this method underestimates the surface temperature variations. A new method based on gas thermal diffusion in the firn manages to quantify surface temperature variations through associated isotopic fractionations. We developed a method to extract air from the ice and to perform isotopic measurements to reduce analytical uncertainties to 0.006 and 0.020‰ for δ15N and δ40Ar. It led to a 16±1.5 °C surface temperature variation during a rapid warming (−70000 yr). To cite this article: A. Landais et al., C. R. Geoscience 336 (2004)." @default.
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- W2008292023 date "2004-08-01" @default.
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- W2008292023 title "Analyse isotopique de l'air piégé dans la glace pour quantifier les variations de température" @default.
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- W2008292023 doi "https://doi.org/10.1016/j.crte.2004.03.013" @default.
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