Representing grounding line migration in synchronous coupling between a marine ice sheet model and a z -coordinate ocean model

Goldberg, D.N., Snow, Kate, Holland, Paul, Jordan, Jim, Campin, Jean-Michel, Heimbach, Patrick, Arthern, Robert and Jenkins, Adrian (2018) Representing grounding line migration in synchronous coupling between a marine ice sheet model and a z -coordinate ocean model. Ocean Modelling, 125. pp. 45-60. ISSN 1463-5003

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Official URL: http://dx.doi.org/10.1016/j.ocemod.2018.03.005

Abstract

Synchronous coupling is developed between an ice sheet model and a z-coordinate ocean model (the MITgcm). A previously-developed scheme to allow continuous vertical movement of the ice-ocean interface of a floating ice shelf (“vertical coupling”) is built upon to allow continuous movement of the grounding line, or point of floatation of the ice sheet (“horizontal coupling”). Horizontal coupling is implemented through the maintenance of a thin layer of ocean ( ∼ 1 m) under grounded ice, which is inflated into the real ocean as the ice ungrounds. This is accomplished through a modification of the ocean model’s nonlinear free surface evolution in a manner akin to a hydrological model in the presence of steep bathymetry. The coupled model is applied to a number of idealized geometries and shown to successfully represent ocean-forced marine ice sheet retreat while maintaining a continuous ocean circulation.

Item Type: Article
Uncontrolled Keywords: Glaciology, Ice-ocean interaction, Moving Boundary
Subjects: F700 Ocean Sciences
F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Becky Skoyles
Date Deposited: 21 Jun 2018 08:30
Last Modified: 12 Oct 2019 10:48
URI: http://nrl.northumbria.ac.uk/id/eprint/34628

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