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Mechanics on the Great Ice Sheets

le 3 juin 2014

James R. Rice, School of Engineering and Applied Science, and Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA



Concepts of solid and fluid mechanics, integrated with materials and thermal sciences, provide a valuable framework for addressing large-scale phenomena of flow, fracture, and hydrology on our planet's major ice sheets. This presentation surveys their application to the following: (a) Large iceberg calving as the enigmatic source of the long-period glacial earthquakes identified along the margins of the Greenland Ice Sheet, (b) Rapid glacial underflooding events as natural hydraulic fractures, like in a well-characterized spontaneous supra-glacial lake drainage on Greenland,  and  (c) Partial internal melting from shear heating as a control on flow resistance at the margins of the rapidly flowing (> 100 m/yr) ice streams on the Western Antarctic Ice Sheet, and perhaps as a process selecting their marginal locations. The studies have been done at Harvard in collaboration with Victor C. Tsai (now at Caltech), Thibaut Perol, John D. Platt, Jenny Suckale (now at Stanford), Colin R. Meyer, and Matheus Fernandes. They are pursued as part of a global effort to better quantify expected ice mass loss rates, related sea-level rise, and ice-sheet effects from, and on, changes in the climate system.
Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi e-média
Bâtiment Léonard De Vinci de - ENS Cachan

61, avenue du Président Wilson 94230 Cachan

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