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- W1619750646 abstract "Icebergs are commonly ignored in current general circulation modelsdespite their connections to ocean stratification, phytoplankton growthand redistribution of freshwater in the Southern Ocean. On the way tofully including icebergs in ocean circulation models, we presentFESOM-IB, the high resolution Finite Element Sea Ice - Ocean Model(FESOM) enhanced by an IceBerg drift and decay module developed at AWIBremerhaven. By solving the momentum equations for iceberg drift, theiceberg trajectory is computed from an evaluation of the FESOM ice/oceanvelocity fields and sea surface height at every time step. Icebergs areassumed to be cubical-shaped and treated as Lagrangian point masseshaving properties such as length, width and height. Simple diagnosticequations for computing the melt rates of icebergs are applied andiceberg dimensions are adjusted accordingly. Therefore the numericalmethod's stability for the solution of the momentum equations has to beindependent from iceberg size. Our numerical procedure proved to bestable across the full range of iceberg classes; small to giant icebergsmay be modelled. We present a 3-year simulation of 308 artificalicebergs from 4 different size classes started at 77 circum-Antarcticlocations. Melt rates as well as the components of iceberg momentumbalance are quantified and the influence of iceberg size on the driftpatterns is discussed. In our simulation giant icebergs tend to stayclose to the Antarctic coast. They drift westwards in the coastalcurrent and may only leave it at well-defined bifurcation points in theWeddell Sea, the Ross Sea and over the Kerguelen Plateau. In contrast,smaller icebergs show an off-shore drift component early in their lives.Independent of the iceberg size, the dominant iceberg velocity componentis changed into eastward as soon as icebergs reach the ACC." @default.
- W1619750646 created "2016-06-24" @default.
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- W1619750646 date "2013-04-01" @default.
- W1619750646 modified "2023-09-26" @default.
- W1619750646 title "Modelling Southern Ocean iceberg drift and decay with FESOM-IB" @default.
- W1619750646 hasPublicationYear "2013" @default.
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