Reference : Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble se...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections
Goelzer, H. [> >]
Noël, B. [> >]
Edwards, T. [> >]
Fettweis, Xavier mailto [Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie >]
Gregory, J. [> >]
Lipscomb, W. [> >]
van de Wal, R. [> >]
van den Broeke, M. [> >]
Copernicus Group
Yes (verified by ORBi)
[en] Future sea-level change projections with process-based stand-alone ice sheet models are typically driven with surface mass balance (SMB) forcing derived from climate models. In this work we address the problems arising from a mismatch of the modelled ice sheet geometry with the geometry used by the climate model. We present a method for applying SMB forcing from climate models to a wide range of Greenland ice sheet models with varying and temporally evolving geometries. In order to achieve that, we translate a given SMB anomaly field as a function of absolute location to a function of surface elevation for 25 regional drainage basins, which can then be applied to different modelled ice sheet geometries. The key feature of the approach is the non-locality of this remapping process. The method reproduces the original forcing data closely when remapped to the original geometry. When remapped to different modelled geometries it produces a physically meaningful forcing with smooth and continuous SMB anomalies across basin divides. The method considerably reduces non-physical biases that would arise by applying the SMB anomaly derived for the climate model geometry directly to a large range of modelled ice sheet model geometries.
Sphères - SPHERES
F.R.S.-FNRS - Fonds de la Recherche Scientifique ; ceci

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