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A model for the spreading and sinking of the Deep Ice Shelf Water in the Ross Sea
Ist Teil von
Antarctic science, 2003-03, Vol.15 (1), p.25-30
Ort / Verlag
Cambridge, UK: Cambridge University Press
Erscheinungsjahr
2003
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Spreading and sinking of the Deep Ice Shelf Water (DISW) in the Ross Sea are analysed using
in situ observations and the results of a nonlinear, reduced gravity, layered numerical model, which is able to
simulate the motion of a bottom trapped current over realistic topography. The model is forced by
prescribing thickness and density of the DISW layer at the southern model boundary as well as ambient
density stratification above the DISW layer. This density structure is imposed using hydrographic data
acquired by the Italian PNRA-CLIMA project. In the model water of the quiescent ambient ocean is allowed
to entrain in the active deep layer due to a simple entrainment parameterization. The importance of forcing
the model with a realistic ambient density is demonstrated by carrying out a numerical simulation using an
idealized ambient density. In a more realistic simulation the path and the density structure of the DISW vein
flowing over the Challenger Basin are obtained and are found to be in good agreement with data. It is found
that entrainment, which is particularly active in regions of strong topographic variation, significantly
influences the pattern followed by the DISW layer. The evolution of the DISW layer beyond the continental
shelf, i.e., in a region where the paucity of experimental data does not allow for a detailed description of the
deep ocean dynamics, is also investigated.