Skip to main content
×
×
Home

Enhancement factors for grounded ice and ice shelves inferred from an anisotropic ice-flow model

  • Ying Ma (a1), Olivier Gagliardini (a1), Catherine Ritz (a1), Fabien Gillet-Chaulet (a2), Gaël Durand (a1) and Maurine Montagnat (a1)...
Abstract

Polar ice is known to be one of the most anisotropic natural materials. For a given fabric the polycrystal viscous response is strongly dependent on the actual state of stress and strain rate. Within an ice sheet, grounded-ice parts and ice shelves have completely different stress regimes, so one should expect completely different impacts of ice anisotropy on the flow. The aim of this work is to quantify, through the concept of enhancement factors, the influence of ice anisotropy on the flow of grounded ice and ice shelves. For this purpose, a full-Stokes anisotropic marine ice-sheet flowline model is used to compare isotropic and anisotropic diagnostic velocity fields on a fixed geometry. From these full-Stokes results, we propose a definition of enhancement factors for grounded ice and ice shelves, coherent with the asymptotic models used for these regions. We then estimate realistic values for the enhancement factors induced by ice anisotropy for grounded ice and ice shelves.

  • View HTML
    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Enhancement factors for grounded ice and ice shelves inferred from an anisotropic ice-flow model
      Available formats
      ×
      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Enhancement factors for grounded ice and ice shelves inferred from an anisotropic ice-flow model
      Available formats
      ×
      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Enhancement factors for grounded ice and ice shelves inferred from an anisotropic ice-flow model
      Available formats
      ×
Copyright
References
Hide All
Bueler, E. and Brown, J.. 2009. Shallow shelf approximation as a ‘sliding law’ in a thermomechanically coupled ice sheet model. J. Geophys. Res., 114(F3), F03008. (10.1029/2008JF001179.)
Castelnau, O., Duval, P., Lebensohn, R. and Canova, G.R.. 1996. Viscoplastic modeling of texture development in polycrystalline ice with a self-consistent approach: comparison with bound estimates. J. Geophys. Res., 101 (B6), 13,851-13,868.
Castelnau, O. and 7 others. 1998. Anisotropic behavior of GRIP ices and flow in central Greenland. Earth Planet. Sci. Lett., 154(1-4), 307-322.
Craven, M. and 7 others. 2005. Borehole imagery of meteoric and marine ice layers in the Amery Ice Shelf, East Antarctica. J. Glaciol., 51(172), 75-84.
Craven, M., Allison, I., Fricker, H.A. and Warner, R.. 2009. Properties of a marine ice layer under the Amery Ice Shelf, East Antarctica. J. Glaciol., 55(192), 717-728.
Durand, G. and 9 others. 2007. Change of the ice rheology with climatic transitions. Implication on ice flow modelling and dating of the EPICA Dome C core. Clim. Past, 3, 155-167.
Durand, G. and 7 others. 2009a. Evolution of the texture along the EPICA Dome C ice core. In Hondoh, T., ed. Physics of ice core records II. Hokkaido, Hokkaido University. Institute of Low Temperature Science, 91-105..
Durand, G., Gagliardini, O., de Fleurian, B., Zwinger, T. and Le Meur, E.. 2009b. Marine ice-sheet dynamics: hysteresis and neutral equilibrium. J. Geophys. Res., 114(F3), F03009. (10.1029/2008JF001170.)
Eisen, O., Hamann, I., Kipfstuhl, S., Steinhage, D. and Wilhelms, F.. 2007. Direct evidence for continuous radar reflector originating from changes in crystal-orientation fabric. Cryosphere, 1(1), 1-10.
Fricker, H.A., Popov, S., Allison, I. and Young, N.. 2001. Distribution of marine ice under the Amery Ice Shelf, East Antarctica. Geophys. Res. Lett., 28(11), 2241-2244.
Gagliardini, O. and Meyssonnier, J.. 1999. Plane flow of an ice sheet exhibiting strain-induced anisotropy. In Hutter, K., Wang, Y. and Beer, H., eds. Advances in cold-region thermal engineering and sciences: technological, environmental, and climatological impact. Berlin, etc., Springer-Verlag, 171-182.
Gagliardini, O. and Meyssonnier, J.. 2000. Simulation of anisotropic ice flow and fabric evolution along the GRIP-GISP2 flowline, central Greenland. Ann. Glaciol., 30, 217-223.
Gagliardini, O. and Meyssonnier, J.. 2002. Lateral boundary conditions for a local anisotropic ice-flow model. Ann. Glaciol., 35, 503-509.
Gillet-Chaulet, F., Gagliardini, O., Meyssonnier, J., Montagnat, M. and Castelnau, O.. 2005. A user-friendly anisotropic flow law for ice- sheet modelling. J. Glaciol., 51(172), 3-14.
Gillet-Chaulet, F., Gagliardini, O., Meyssonnier, J., Zwinger, T. and Ruokolainen, J.. 2006. Flow-induced anisotropy in polar ice and related ice-sheet flow modelling. J. Non-Newtonian FluidMech., 134(1-3), 33-43.
Hutter, K. 1983. Theoretical glaciology; material science of ice and the mechanics of glaciers and ice sheets. Dordrecht, etc., D. Reidel Publishing Co./Tokyo, Terra Scientific Publishing Co.
Huybrechts, P. 1990. A 3-D model for the Antarctic ice sheet: a sensitivity study on the glacial-interglacial contrast. Climate Dyn., 5(2), 79-92.
Kirchner, N. and Faria, S.. 2009. The multiscale structure of Antarctica. Part II: ice shelves. In Hondoh, T., ed. Physics of ice core records II. Hokkaido, Hokkaido University. Institute of Low Temperature Science, 61-71.
MacAyeal, D.R. 1989. Large-scale ice flow over a viscous basal sediment: theory and application to Ice Stream B, Antarctica. J. Geophys. Res., 94(B4), 4071-4087.
Mangeney, A. and Califano, F.. 1998. The shallow ice approximation for anisotropic ice: formulation and limits. J. Geophys. Res., 103(B1), 691-706.
Mangeney, A., Califano, F. and Castelnau, O.. 1996. Isothermal flow of an anisotropic ice sheet in the vicinity of an ice divide. J. Geophys. Res., 101 (B12), 28,189-28,204.
Martín, C., Hindmarsh, R.C.A. and Navarro, F.J.. 2009. On the effects of divide migration, along-ridge flow, and basal sliding on isochrones near an icedivide. J. Geophys. Res., 114(F2), F02006. (10.1029/2008JF001025.)
Pettit, E.C., Thorsteinsson, T., Jacobson, H.P. and Waddington, E.D.. 2007. The role of crystal fabric in flow near an ice divide. J. Glaciol., 53(181), 277-288.
Philip, A. and Meyssonnier, J.. 1999. Anisotropic isothermal ice-cap flow with the shallow ice approximation. In Hutter, K., Wang, Y. and Beer, H., eds. Advances in cold-region thermal engineering and sciences: technological, environmental, and climatological impact. Berlin, etc., Springer-Verlag, 237-248.
Pimienta, P., Duval, P. and Lipenkov, V.Y.. 1987. Mechanical behavior of anisotropic polar ice. IAHS Publ. 170 (Symposium at Vancouver 1987 – The Physical Basis of Ice Sheet Modelling), 57-66.
Placidi, L., Greve, R., Seddik, H. and Faria, S.H.. 2010. Continuum- mechanical, anisotropic flow model for polar ice masses, based on an anisotropic flow enhancement factor. Contin. Mech. Thermodyn., 22(3), 221-237.
Seddik, H., Greve, R., Placidi, L., Hamann, I. and Gagliardini, O.. 2008. Application of a continuum-mechanical model for the flow of anisotropic polar ice to the EDML core, Antarctica. J. Glaciol., 54(187), 631-642.
Staroszczyk, R. and Morland, L.W.. 2000. Plane ice-sheet flow with evolving orthotropic fabric. Ann. Glaciol., 30, 93-101.
Thorsteinsson, T., Kipfstuhl, J. and Miller, H.. 1997. Textures and fabrics in the GRIP ice core. J. Geophys. Res., 102(C12), 26,583-26,599.
Treverrow, A. 2009. The flow of polycrystalline anisotropic ice: laboratory and model studies. (PhD thesis, University of Tasmania.)
Van der Veen, C.J. and Whillans, I.M.. 1994. Development of fabric in ice. Cold Reg. Sci. Technol., 22(2), 171-195.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Glaciology
  • ISSN: 0022-1430
  • EISSN: 1727-5652
  • URL: /core/journals/journal-of-glaciology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 1
Total number of PDF views: 54 *
Loading metrics...

Abstract views

Total abstract views: 87 *
Loading metrics...

* Views captured on Cambridge Core between 8th September 2017 - 18th August 2018. This data will be updated every 24 hours.