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- W2276684828 abstract "At the base of a thick ice sheet the temperature locally reaches the pressure melting point and melting generates athin subglacial water layer. The basal water lubricates the base and thus enhances the sliding of the ice sheet. Asa consequence of sliding, the heat source of internal strain heating decreases and the basal ice cools down overtime. When frictional heat and heat advection do not counterbalance this, the ice will become frozen to the bedrockagain. In addition, strain heating within a temperate ice layer generates a liquid water fraction in the ice, leadingto a softer material and enhanced deformation. If the horizontal or vertical advection of cold ice to the base isweak, this positive feedback will lead to a local creep instability. The effect of basal water is thus twofold: it affectsthe sliding, as well as the rheology and via both ways the ice dynamics. Subglacial water is therefore a crucialcomponent in the dynamic evolution of ice sheets.We present numerical simulations of the present day ice flow using the three-dimensional thermo-coupled full-Stokes modelTIMFD3on a 2.5 km horizontal grid in the area of the western Dronning Maud Land, Antarc-tica, including the three ice streams Stancomb-Wills, Veststraumen and Plogbreen and the adjacent Brunt andRiiser- Larsen ice shelves. Three different flux routing algorithms for the subglacial meltwater and a modifiedWeertman-type sliding relation were implemented in the model to account for higher sliding velocities under wetbasal conditions.Subsequent to spin-up simulations different sliding simulations considering wet and dry basal conditions wereperformed. The simulations show a cyclic behaviour on millennial time scale at distinct locations in the modeldomain. We estimate the distribution of subglacial water based on different flux routing methods and the effect onthe ice flow and the basal thermal regime. We further present our analysis of the involved feedback mechanismbetween ice flow, temperature and rheology, that are related to the simulated cyclic behaviour." @default.
- W2276684828 created "2016-06-24" @default.
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- W2276684828 date "2013-04-09" @default.
- W2276684828 modified "2023-09-27" @default.
- W2276684828 title "Cyclic behaviour on millennial time scale due to creep instabilities in western Dronning Maud Land, Antarctica" @default.
- W2276684828 hasPublicationYear "2013" @default.
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