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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, D09120, doi:10.1029/2006JD007407, 2007

Very high-elevation Mont Blanc glaciated areas not affected by the 20th century climate change

C. Vincent

Laboratoire de Glaciologie et de Géophysique de l'Environnement, Centre National de la Recherche Scientifique, Saint Martin d'Hères, France


E. Le Meur

Laboratoire de Glaciologie et de Géophysique de l'Environnement, Centre National de la Recherche Scientifique, Saint Martin d'Hères, France


D. Six

Laboratoire de Glaciologie et de Géophysique de l'Environnement, Centre National de la Recherche Scientifique, Saint Martin d'Hères, France


M. Funk

Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie, ETH Zentrum, Zürich, Switzerland


M. Hoelzle

Department of Geography, University of Zürich-Irchel, Zürich, Switzerland


S. Preunkert

Laboratoire de Glaciologie et de Géophysique de l'Environnement, Centre National de la Recherche Scientifique, Saint Martin d'Hères, France


Abstract

This paper analyses the impact of climate change over the last 100 years on high-elevation glaciated areas of the Mont Blanc range, comprising ice fields covering the top of the Mont Blanc (4808 m) and Dôme du Goûter (4300 m) areas. Surface ablation is negligible for these high-elevation areas and the surface mass balance is mainly controlled by snow accumulation. At Dôme du Goûter, ice fluxes have been calculated through two transversal sections by two independent methods in order to assess long-term surface accumulation. A comparison between these results and recent accumulation observations, together with the strong relationship between valley precipitation and snow accumulation, suggests that surface accumulation rates did not change significantly over the entire 20th century. Moreover, the small ice thickness changes, less than 3 m on the average, observed at Mont Blanc and Dôme du Goûter between 1905 and 2005 clearly reveal that these high-elevation glaciated areas have not been significantly affected by climate change over the last 100 years.

Received 14 April 2006; accepted 13 December 2006; published 15 May 2007.

Keywords: glacier; climate; 20th century.

Index Terms: 0720 Cryosphere: Glaciers; 1616 Global Change: Climate variability (1635, 3305, 3309, 4215, 4513); 1854 Hydrology: Precipitation (3354); 1863 Hydrology: Snow and ice (0736, 0738, 0776, 1827); 1621 Global Change: Cryospheric change (0776).

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Citation: Vincent, C., E. Le Meur, D. Six, M. Funk, M. Hoelzle, and S. Preunkert (2007), Very high-elevation Mont Blanc glaciated areas not affected by the 20th century climate change, J. Geophys. Res., 112, D09120, doi:10.1029/2006JD007407.