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Dynamique et bilan de masse des glaciers de montagne (Alpes, Islande, Himalaya) : contribution de l'imagerie satellitaire

Abstract : In a context of general glacier retreat, a continuous and global monitoring of mountain glaciers is required but cannot be achieved thanks to ground measurements. In this thesis, we demonstrate that high resolution satellite optical images permit to observe the dynamic and volumetric evolutions of glaciers.
Surface velocities of Mont Blanc glaciers (Alps) show short term (summer) fluctuations that are connected to the intensity of surface melting and subglacial hydrological network. A significant slow down (30 to 40\% in 20 years) of the Mer de Glace suggests that glacier dynamics play an important role in their response to climate change.
For the Mont Blanc glaciers, thinning is enhanced in the ablation area during the last 10 years whereas, at higher elevation, no significant thickness change is detected. A similar signal is also observed in Himalaya and Iceland. Melting of glaciers in these 2 regions may have risen global sea level by up to 0.13 mm/year in the
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https://tel.archives-ouvertes.fr/tel-00011256
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Submitted on : Thursday, December 22, 2005 - 11:50:31 AM
Last modification on : Saturday, January 9, 2021 - 3:31:13 AM
Long-term archiving on: : Saturday, April 3, 2010 - 7:47:28 PM

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  • HAL Id : tel-00011256, version 1

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Etienne Berthier. Dynamique et bilan de masse des glaciers de montagne (Alpes, Islande, Himalaya) : contribution de l'imagerie satellitaire. domain_other. Université Paul Sabatier - Toulouse III, 2005. Français. ⟨tel-00011256⟩

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