caa a22 4500 445814101 CHVBK 20180317145220.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10712-011-9133-3 doi (NATIONALLICENCE)springer-10.1007/s10712-011-9133-3 Representing Grounding Line Dynamics in Numerical Ice Sheet Models: Recent Advances and Outlook [Elektronische Daten] [David Docquier, Laura Perichon, Frank Pattyn] Recent satellite observations of the Antarctic and Greenland ice sheets show accelerated ice flow and associated ice sheet thinning along coastal outlet glaciers in contact with the ocean. Both processes are the result of grounding line retreat due to melting at the grounding line (the grounding line is the contact of the ice sheet with the ocean, where it starts to float and forms an ice shelf or ice tongue). Such rapid ice loss is not yet included in large-scale ice sheet models used for IPCC projections, as most of the complex processes are poorly understood. Here we report on the state-of-the art of grounding line migration in marine ice sheets and address different ways in which grounding line migration can be attributed and represented in ice sheet models. Using one-dimensional ice flow models of the ice sheet/ice shelf system we carried out a number of sensitivity experiments with different spatial resolutions and stress approximations. These are verified with semi-analytical steady state solutions. Results show that, in large-scale finite-difference models, grounding line migration is dependent on the numerical treatment (e.g. staggered/non-staggered grid) and the level of physics involved (e.g. shallow-ice/shallow-shelf approximation). Springer Science+Business Media B.V., 2011 Marine ice sheet instability nationallicence Grounding line nationallicence Ice sheet modeling nationallicence West Antarctic ice sheet nationallicence Docquier David Laboratoire de Glaciologie, Université Libre de Bruxelles, CP160/03, Av. F.D. Roosevelt 50, 1050, Brussels, Belgium aut Perichon Laura Laboratoire de Glaciologie, Université Libre de Bruxelles, CP160/03, Av. F.D. Roosevelt 50, 1050, Brussels, Belgium aut Pattyn Frank Laboratoire de Glaciologie, Université Libre de Bruxelles, CP160/03, Av. F.D. Roosevelt 50, 1050, Brussels, Belgium aut Surveys in Geophysics Springer Netherlands 32/4-5(2011-09-01), 417-435 0169-3298 32:4-5<417 2011 32 10712 https://doi.org/10.1007/s10712-011-9133-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10712-011-9133-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Docquier David Laboratoire de Glaciologie, Université Libre de Bruxelles, CP160/03, Av. F.D. Roosevelt 50, 1050, Brussels, Belgium aut NATIONALLICENCE 700 1- Perichon Laura Laboratoire de Glaciologie, Université Libre de Bruxelles, CP160/03, Av. F.D. Roosevelt 50, 1050, Brussels, Belgium aut NATIONALLICENCE 700 1- Pattyn Frank Laboratoire de Glaciologie, Université Libre de Bruxelles, CP160/03, Av. F.D. Roosevelt 50, 1050, Brussels, Belgium aut NATIONALLICENCE 773 0- Surveys in Geophysics Springer Netherlands 32/4-5(2011-09-01), 417-435 0169-3298 32:4-5<417 2011 32 10712 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer