Interaction between ice sheet dynamics and subglacial lake circulation: a coupled modelling approach
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In this article, an improved three-dimensional full-Stokes ice flow model with a nonlinear rheology was employed to simulate the basal mass balance at the lake-ice interface, and a newly developed coupler to exchange boundary conditions between the two individual models.Abstract:
. Subglacial lakes in Antarctica influence to a large extent the flow of the ice sheet. In this study we use an idealised lake geometry to study this impact. We employ a) an improved three-dimensional full-Stokes ice flow model with a nonlinear rheology, b) a three-dimensional fluid dynamics model with eddy diffusion to simulate the basal mass balance at the lake-ice interface, and c) a newly developed coupler to exchange boundary conditions between the two individual models. Different boundary conditions are applied over grounded ice and floating ice. This results in significantly increased temperatures within the ice on top of the lake, compared to ice at the same depth outside the lake area. Basal melting of the ice sheet increases this lateral temperature gradient. Upstream the ice flow converges towards the lake and accelerates by about 10% whenever basal melting at the ice-lake boundary is present. Above and downstream of the lake, where the ice flow diverges, a velocity decrease of about 10% is simulated.read more
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The importance of tidewater glaciers for marine mammals and seabirds in Svalbard, Norway
Christian Lydersen,Philipp Assmy,Stig Falk-Petersen,Jack Kohler,Kit M. Kovacs,Marit Reigstad,Harald Steen,Hallvard Strøm,Arild Sundfjord,Øystein Varpe,Waldek Walczowski,Jan Marcin Węsławski,Marek Zajaczkowski +12 more
TL;DR: In this paper, the authors review current knowledge regarding the importance of these areas for these animals and reflect upon the processes that create these apparent “hotspots”, which is known for a long time that these glacier front areas are important feeding areas for seabirds and marine mammals.
Journal ArticleDOI
Grounding-line migration in plan-view marine ice-sheet models: results of the ice2sea MISMIP3d intercomparison
Frank Pattyn,Laura Perichon,Gaël Durand,Lionel Favier,Olivier Gagliardini,Richard C. A. Hindmarsh,Thomas Zwinger,Torsten Albrecht,Torsten Albrecht,Stephen Cornford,David Docquier,Johannes J. Fürst,Daniel Goldberg,G. Hilmar Gudmundsson,Angelika Humbert,Angelika Humbert,Moritz Hütten,Moritz Hütten,Philippe Huybrechts,Guillaume Jouvet,Thomas Kleiner,Eric Larour,Daniel F. Martin,Mathieu Morlighem,Anthony J. Payne,David Pollard,Martin Rückamp,Oleg Rybak,Helene Seroussi,Malte Thoma,Nina Wilkens +30 more
TL;DR: In this paper, the authors present results of an intercomparison experiment for plan-view marine ice-sheet models and show that the numerical error associated with predicting grounding line motion can be reduced significantly below the errors associated with parameter ignorance and uncertainties in future scenarios.
Grounding-line migration in plan-view marine ice-sheet models: results of the ice2sea MISMIP3d intercomparison
Frank Pattyn,Laura Perichon,Gaël Durand,Olivier Gagliardini,Lionel Favier,Richard C. A. Hindmarsh,Thomas Zwinger,Mismip d Participants +7 more
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Experimental design for three interrelated marine ice sheet and ocean model intercomparison projects: MISMIP v. 3 (MISMIP +), ISOMIP v. 2 (ISOMIP +) and MISOMIP v. 1 (MISOMIP1)
Xylar Asay-Davis,Stephen Cornford,Gaël Durand,Gaël Durand,Benjamin K. Galton-Fenzi,Benjamin K. Galton-Fenzi,Rupert Gladstone,Rupert Gladstone,G. Hilmar Gudmundsson,Tore Hattermann,David M. Holland,Denise Holland,Paul R. Holland,Daniel F. Martin,Pierre Mathiot,Pierre Mathiot,Frank Pattyn,Helene Seroussi +17 more
TL;DR: The Marine Ice Sheet Ocean Model Intercomparison Project (MISOMIP) as mentioned in this paper is a community effort aimed at designing and coordinating a series of model intercomparisons projects (MIPs) for model evaluation in idealized setups, model verification based on observations, and future projections for key regions of the West Antarctic Ice Sheet (WAIS).
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Modeling Ice Shelf/Ocean Interaction in Antarctica: A Review
Michael S. Dinniman,Xylar Asay-Davis,Benjamin K. Galton-Fenzi,Paul R. Holland,Adrian Jenkins,Ralph Timmermann +5 more
TL;DR: In this article, different ways in which ice shelf/ocean interactions are modeled and emerging directions that will enhance understanding of how the ice shelves are melting now and how this might change in the future.
References
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Journal ArticleDOI
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An Active Subglacial Water System in West Antarctica Mapped from Space
TL;DR: Satellite laser altimeter elevation profiles from 2003 to 2006 collected over the lower parts of Whillans and Mercer ice streams reveal 14 regions of temporally varying elevation, which are interpreted as the surface expression of subglacial water movement.
Journal ArticleDOI
A new three-dimensional higher-order thermomechanical ice sheet model: Basic sensitivity, ice stream development, and ice flow across subglacial lakes
TL;DR: In this paper, a new 3D higher-order thermomechanically coupled ice sheet model is developed, which is able to simulate the evolution of an ice stream within the ice sheet and shows important aspects of observed ice stream features, such as the surface flattening and the importance of side drag.