Multi-decadal evolution of ice/snow covers in the Mont-Blanc massif (France).

• Main Authors: Guillet, Grégoire, Ravanel, Ludovic
• Other Authors: Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS), European Geosciences Union
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2017
• Subjects: [SDE]Environmental Sciences; Ice; permafrost
• Online Access: https://sde.hal.science/hal-01787198

International audience Dynamics and evolution of the major glaciers of the Mont-Blanc massif have been vastly studied since the XXthcentury. Ice/snow covers on steep rock faces as part of the cryosphere however remain poorly studied with onlyqualitative descriptions existing. The study of ice/snow covers is primordial to further understand permafrost degradationthroughout the Mont-Blanc massif and to improve safety and prevention for mountain sports practitioners.This study focuses on quantifying the evolution of ice/snow covers surface during the past century using a speciallydeveloped monoplotting tool using Bayesian statistics and Markov Chain Monte Carlo algorithms. Combining digitalelevation models and photographs covering a time-span of 110 years, we calculated the ice/snow cover surfacefor 3 study sites — North faces of the Tour Ronde (3792 m a.s.l.) and the Grandes Jorasses (4208 m a.s.l.) andTriangle du Tacul (3970 m a.s.l.) — and deduced the evolution of their area throughout the XXth century.First results are showing several increase/decrease periods. The first decrease in ice/snow cover surface occurs betweenthe 1940’s and the 1950’s. It is followed by an increase up to the 1980’s. Since then, ice/snow covers show ageneral decrease in surface which is faster since the 2010’s. Furthermore, the gain/loss during the increase/decreaseperiods varies with the considered ice/snow cover, making it an interesting cryospheric entity of its own.