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VARIATIONS DE LA SIGNATURE ISOTOPIQUE δ13C DU CARBONE INORGANIQUE DISSOUS DANS LES RIVIÈRES ET LES FLEUVES

Abstract : The scientific objective of this work is to better understand the riverine carbon transfers to the oceans and to identify the different biogeochemical processes controlling these transfers using carbon isotopic signature (δ13C). In order to do that, 25 watersheds have been investigated in the world, going from small catchments to large river basins. The results emphasize the major control of CO2 degassing to the atmosphere and of organic carbon oxidation (allochtonous and autochtonous) on the riverine δ13CDIC. The average isotopic signature δ13CDIC of the inorganic carbon riverine flux into the oceans has been estimated in this study to be -11,8‰. Finally, a first approach of a numerical model (δ-Carb) has been developed to simulate the δ13CDIC evolution in rivers.
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Submitted on : Tuesday, October 30, 2007 - 2:58:40 PM
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Frédéric Brunet. VARIATIONS DE LA SIGNATURE ISOTOPIQUE δ13C DU CARBONE INORGANIQUE DISSOUS DANS LES RIVIÈRES ET LES FLEUVES. Géochimie. Université Paul Sabatier - Toulouse III, 2004. Français. ⟨tel-00184081⟩

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