Total mercury and methylmercury in high altitude surface snow from the French Alps |
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| Authors: | Marusczak Nicolas Larose Catherine Dommergue Aurélien Yumvihoze Emmanuel Lean David Nedjai Rachid Ferrari Christophe |
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| Affiliation: | a Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE) CNRS UMR 5183, 54, rue Molière, Domaine Universitaire, B.P. 96, 38402 Saint Martin d'Hères, Franceb Politiques publiques, Action politique, Territoires (PACTE) CNRS UMR 5194, Université Pierre Mendès-France Grenoble II, Institut d'Études Politiques de Grenoble, Université Joseph Fourier, Grenoble I, Francec Laboratoire AMPERE, UMR CNRS 5005, Ecole Centrale de Lyon, Université de Lyon, 36 avenue Guy de Collongue, 69134 Ecully, Franced Polytech' Grenoble, Université Joseph Fourier, 28 Avenue Benoît Frachon, BP 53, 38041 Grenoble, Francee Biology Department, University of Ottawa, 30 Marie Curie, Ottawa, ON, Canada |
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| Abstract: | Surface snow samples were collected weekly from the 31st of December 2008 to the 21st of June 2009 from Lake Bramant in the French Alps. Total mercury (THg), total dissolved mercury (THgD), methylmercury (MeHg) and particle distributions in surface snow were analyzed. Results showed that THg concentrations, MeHg concentrations and particle load increased with snow surface temperature, which is an indicator of rising temperatures as the season progresses. Significant correlations between MeHg and snow surface temperature and MeHg and total particles greater than 10 μm were observed. This suggests that the MeHg found in the snow originates from atmospheric deposition processes rather than in situ snowpack sources. This study suggests that an important post-winter atmospheric deposition of MeHg and THg occurs on summital zones of the French Alps and it is likely that this contamination originates from the surrounding valleys. |
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| Keywords: | Mercury Methylmercury Particles Atmospheric deposition processes Snow French Alps |
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