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d13C pattern of dissolved inorganic carbon in a small granitic catchment: the Strengbach case study (Vosges mountains, France)

Amiotte Suchet, Philippe and Aubert, Dominique and Probst, Jean-Luc and Gauthier-Lafaye, François and Probst, Anne and Andreux, Francis and Viville, Daniel d13C pattern of dissolved inorganic carbon in a small granitic catchment: the Strengbach case study (Vosges mountains, France). (1999) Chemical Geology, vol. 1 (n° 1-4). pp. 129-145. ISSN 0009-2541

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Official URL: http://dx.doi.org/10.1016/S0009-2541(99)00037-6

Abstract

The transfers and origins of dissolved inorganic carbon DIC. were studied for a year in a soil–spring–stream system in the Strengbach catchment, Vosges mountains, France. This 80 ha experimental research basin is located on the eastern side of the mountains, at an altitude ranging from 883 to 1146 m.a.s.l. and is mainly covered by spruce 80%.. Brown acid and podzolic soils developed on a granitic basement, and, as a result, the DIC originates solely from CO2 generated by oxidation of soil organic matter. The d13CDIC. in catchment waters is highly variable, from about y22‰ in the springs and piezometers to about y12‰ in the stream at the outlet of the catchment. In the springs, pronounced seasonal variations of d13C exist, with the DIC in isotopic equilibrium with the soil CO that has estimated d13DIC 2 C of about y24‰ in winter and y20‰ in summer. These seasonal variations reflect an isotopic fractionation that seems only induced by molecular diffusion of soil CO2 in summer. In stream water, seasonal variations are small and the relatively heavy DIC y12‰ on average. is a result of isotopic equilibration of the aqueous CO2 with atmospheric CO2.

Item Type:Article
Additional Information:This publication is available at http://www.sciencedirect.com/science/journal/00092541
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
Other partners > Université de Bourgogne - UB (FRANCE)
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Deposited By: Florence Amor
Deposited On:22 Apr 2010 08:53

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