δ13C of carbon dioxide in ancient air from ice core samples

International audience The concentration and stable carbon isotope composition δ13CO2) of carbon dioxide (CO2) trapped in ancient ice are essential for the reconstruction of the paleo record of greenhouse gases, the study of the global carbon cycle, and the prediction of the future climatic evolutio...

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Bibliographic Details
Main Authors: V. Lavric, J., Barnola, Jean-Marc, Chappellaz, Jérôme, C. Leunberger, M., Fischer, H., Raynaud, D.
Other Authors: Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Climate and Environmental Physics Bern (CEP), Physikalisches Institut Bern, Universität Bern = University of Bern = Université de Berne (UNIBE)-Universität Bern = University of Bern = Université de Berne (UNIBE), Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie, Universität Heidelberg Heidelberg = Heidelberg University
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2005
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Online Access:https://insu.hal.science/insu-00421290
Description
Summary:International audience The concentration and stable carbon isotope composition δ13CO2) of carbon dioxide (CO2) trapped in ancient ice are essential for the reconstruction of the paleo record of greenhouse gases, the study of the global carbon cycle, and the prediction of the future climatic evolution. At present, high-resolution ice core δ13CO2 data for larger time spans are scarce. New analytical methods are being developed with the objective to increase the time resolution smaller sample size), to improve the accuracy of the measurements, and, particularly in clathrate ice, to optimize the extraction efficiency. The recent analytical improvements include different continuous flow setups (LGGE, University of Bern) and off-line extraction by sublimation (AWI). Thus obtained higher sensitivity to changes in the δ13CO2 record is important in view of the small variations of few tens of a per mill observed in previous studies. The ongoing measurements are performed primarily on ice from two Antarctic drilling sites, the EPICA Dome Concordia EDC) and Dronning Maud Land (EDML). We will present the status of δ13CO2 and associated CO2 concentrations data from ice cores with a focus on the Holocene and the recent glacial–interglacial transitions, and discuss the available constraints that they provide on the global carbon system and its past variations.