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Modelling the Impact of Submarine Frontal Melting and Ice Mélange on Glacier Dynamics : Volume 9, Issue 1 (09/01/2015)

By Krug, J.

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Book Id: WPLBN0004023179
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: Modelling the Impact of Submarine Frontal Melting and Ice Mélange on Glacier Dynamics : Volume 9, Issue 1 (09/01/2015)  
Author: Krug, J.
Volume: Vol. 9, Issue 1
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Durand, G., Weiss, J., Krug, J., & Gagliardini, O. (2015). Modelling the Impact of Submarine Frontal Melting and Ice Mélange on Glacier Dynamics : Volume 9, Issue 1 (09/01/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: CNRS, LGGE, 38041 Grenoble, France. Two mechanisms are generally proposed to explain seasonal variations in the calving front of tidewater glaciers: submarine melting of the calving face and the mechanical back-force applied by the ice mélange. However, the way these processes affect the calving rate and the glacier dynamics remains uncertain. In this study, we used the finite element model Elmer/Ice to simulate the impact of these forcings on more than 200 two dimensional theoretical flowline glacier configurations. The model, which includes calving processes, suggests that frontal melting affects the position of the terminus only slightly (< a few hundred meters) and does not affect the pluriannual glacier mass balance at all. However, the ice mélange has a greater impact on the advance and retreat cycles of the glacier front (more than several 1000 m) and its consequences for the mass balance are not completely negligible, stressing the need for better characterization of forcing properties. We also show that ice mélange forcing against the calving face can mechanically prevent crevasse propagation at sea level and hence prevent calving. Results also revealed different behaviors in grounded and floating glaciers: in the case of a floating extension, the heaviest forcings can disrupt the glacier equilibrium by modifying its buttressing and ice flux at the grounding line.

Summary
Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics

Excerpt
Cazenave, A.: How fast are the ice sheets melting?, Science, 314, 1250–1252, 2006.; Amundson, J., Truffer, M., Lüthi, M., Fahnestock, M., West, M., and Motyka, R.: Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbræ, Greenland, Geophys. Res. Lett., 35, L22501, doi:10.1029/2008GL035281, 2008.; Amundson, J. M., Fahnestock, M., Truffer, M., Brown, J., Lüthi, M. P., and Motyka, R. J.: Ice mélange dynamics and implications for terminus stability, Jakobshavn Isbræ, Greenland, J. Geophys. Res., 115, F01005, doi:10.1029/2009JF001405, 2010.; Anderson, D. L.: Growth rate of sea ice, J. Glaciol., 3, 1170–1172, 1961.; Bartholomaus, T. C., Larsen, C. F., and O'Neel, S.: Does calving matter? Evidence for significant submarine melt, Earth Planet. Sc. Lett., 380, 21–30, 2013.; Benn, D. I., Hulton, N. R., and Mottram, R. H.: 'Calving laws','sliding laws' and the stability of tidewater glaciers, Ann. Glaciol., 46, 123–130, 2007{a}.; Benn, D. I., Warren, C. R., and Mottram, R. H.: Calving processes and the dynamics of calving glaciers, Earth-Sci. Rev., 82, 143–179, 2007{b}.; Church, J., Clark, P., Cazenave, A., Gregory, J., Jevrejeva, S., Levermann, A., Merrifield, M., Milne, G., Nerem, R., Nunn, P., Payne, A., Pfeffer, W., Stammer, D., and Unnikrishnan, A.: Sea Level Change, in: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Stocker, T., Qin, D., Plattner, G.-K., Tignor, M., Allen, S., Boschung, J., Nauels, A., Xia, Y., Bex, V., and Midgley, P., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 2013.; Cook, S., Rutt, I. C., Murray, T., Luckman, A., Zwinger, T., Selmes, N., Goldsack, A., and James, T. D.: Modelling environmental influences on calving at Helheim Glacier in eastern Greenland, The Cryosphere, 8, 827–841, doi:10.5194/tc-8-827-2014, 2014.; Copland, L., Mueller, D. R., and Weir, L.: Rapid loss of the Ayles ice shelf, Ellesmere Island, Canada, Geophys. Res. Lett., 34, L21501, doi:10.1029/2007GL031809, 2007.; Durand, G., Gagliardini, O., De Fleurian, B., Zwinger, T., and Le Meur, E.: Marine ice sheet dynamics: Hysteresis and neutral equilibrium, J. Geophys. Res.-Earth, 114, F03009, doi:10.1029/2008JF001170, 2009.; Fricker, H., Young, N., Coleman, R., Bassis, J., and Minster, J.-B.: Multi-year monitoring of rift propagation on the Amery Ice Shelf, East Antarctica, Geophys. Res. Lett., 32, L02502, doi:10.1029/2004GL021036, 2005.; Gagliardini, O., Durand, G., Zwinger, T., Hindmarsh, R., and Le Meur, E.: Coupling of ice-shelf melting and buttressing is a key process in ice-sheets dynamics, Geophys. Res. Lett., 37, L14501, doi:10.1029/2010GL043334, 2010.; Heinke, J., Ostberg, S., Schaphoff, S., Frieler, K., Müller, C., Gerten, D., Meinshausen, M., and Lucht, W.: A new climate dataset for systematic assessments of climate change impacts as a function of global warming, Geosci. Model Dev., 6, 1689–1703, doi:10.5194/gmd-6-1689-2013, 2013.; Higgins, A. K.: North Greenland glacier velocities and calf ice production, Polarforschung, 60, 1–23, 1991.; Holland, D. M., Thomas, R. H., De Young, B., Ribergaard, M. H., and Lyberth, B.: Acceleration of Jakobshavn Isbrae triggered by warm subsurface ocean waters, Nat. Geosci., 1, 659–664, 2008.; Howat, I. M., Ahn, Y., Joughin, I., van den Broeke, M. R., Lenaerts, J., and Smith, B.: Mass balance of Greenland's three largest

 

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