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Isotopic characteristics of the Garonne River and its tributaries

Lambs, Luc and Brunet, Frédéric and Probst, Jean-Luc Isotopic characteristics of the Garonne River and its tributaries. (2009) Rapid Communications in Mass Spectrometry, vol. 3 (n° 16). pp. 2543-2550. ISSN 0951-4198

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Official URL: http://dx.doi.org/10.1002/rcm.4102

Abstract

The Garonne is the largest river in the south-west of France, and its drainage basin stretches between the Pyrenees and the Massif Central mountains. Until now, no water stable isotope study has been performed on the whole Garonne river basin which is composed of different geological substrata, and where the water resources are limited during the dry summer period. This study focuses on the Garonne river and its tributaries from the Pyre´ne´es foothill upstream to its confluence with the Lot River downstream. The aim of the study is to determine the origins of the surface waters using their chemical and stable isotopic compositions (18O, D and 13C), to better understand their circulation within the drainage basin and to assess the anthropogenic influences. The Garonne displays a specific 18O seasonal effect, and keeps its Pyre´nean characteristics until its confluence with the Tarn River. The difference in the dissolved inorganic carbon (DIC) comes mainly from the change in lithology between the Pyre´ne´es and the Massif Central mountains. Agriculture activity is only detected in the small tributaries.

Item Type:Article
Additional Information:Thanks to John Wiley and sons editor. The definitive version is available at http://www3.interscience.wiley.com/cgi-bin/home The original PDF of the article can be found at Rapid communications in mass spectrometry website : http://www3.interscience.wiley.com/journal/4849/home
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Florence Amor

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