Zobrazeno 1 - 10
of 34
pro vyhledávání: '"86A40"'
Sedimentary basins beneath many Antarctic ice streams host substantial volumes of groundwater, which can be exchanged with a "shallow" subglacial hydrological system of till and channelised water. This exchange contributes substantially to basal wate
Externí odkaz:
http://arxiv.org/abs/2409.11848
Autor:
Helanow, Christian, Ahlkrona, Josefin
The properties of a block preconditioner that has been successfully used in finite element simulations of large scale ice-sheet flow is examined. The type of preconditioner, based on approximating the Schur complement with the mass matrix scaled by t
Externí odkaz:
http://arxiv.org/abs/2307.14688
Autor:
Offord, Wilfred, Coughlan, Michael, Hewitt, Ian J., Harrington, Heather A., Grindstaff, Gillian
During the summer melt period, ponds form on the surface of Arctic sea ice as it melts, with important consequences for ice evolution and marine ecology. Due to the ice-albedo feedback, these melt ponds experience uneven heat absorption, and exhibit
Externí odkaz:
http://arxiv.org/abs/2212.07961
Autor:
Bueler, Ed
Publikováno v:
Journal of Glaciology, vol. 69, no. 276, pages 930-935, 2022
Numerical ice sheet models compute evolving ice geometry and velocity fields using various stress-balance approximations and boundary conditions. At high spatial resolution, with horizontal mesh/grid resolutions of a few kilometers or smaller, these
Externí odkaz:
http://arxiv.org/abs/2206.14352
Publikováno v:
Journal of Computational Physics, 474:111766, 2023
We implement a data assimilation framework for integrating ice surface and terminus position observations into a numerical ice-flow model. The model uses the well-known shallow shelf approximation (SSA) coupled to a level set method to capture ice mo
Externí odkaz:
http://arxiv.org/abs/2201.12235
Viscous contact problems describe the time evolution of fluid flows in contact with a surface from which they can detach and reattach. These problems are of particular importance in glaciology, where they arise in the study of grounding lines and sub
Externí odkaz:
http://arxiv.org/abs/2111.05593
Stokes variational inequalities arise in the formulation of glaciological problems involving contact. We consider the problem of a two-dimensional marine ice sheet with a grounding line, although the analysis presented here is extendable to other con
Externí odkaz:
http://arxiv.org/abs/2108.00046
Numerical models for predicting future ice-mass loss of the Antarctic and Greenland ice sheet requires accurately representing their dynamics. Unfortunately, ice-sheet models suffer from a very strict time-step size constraint, which for higher-order
Externí odkaz:
http://arxiv.org/abs/2106.16097
We present a new conceptual model of the Earth's glacial-interglacial cycles, one leading to governing equations for which the vector field has a hyperplane of discontinuities. This work extends the classic Budyko- and Sellers-type conceptual energy
Externí odkaz:
http://arxiv.org/abs/2101.01707
Autor:
Piersanti Paolo, Temam Roger
Publikováno v:
Advances in Nonlinear Analysis, Vol 12, Iss 1, Pp 95-110 (2023)
In this article, we formulate a model describing the evolution of thickness of a grounded shallow ice sheet. The thickness of the ice sheet is constrained to be nonnegative. This renders the problem under consideration an obstacle problem. A rigorous
Externí odkaz:
https://doaj.org/article/56229a2d7812410c93b09f066904750b
