Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections

Goelzer, Heiko; Noël, Brice P. Y.; Edwards, Tamsin L.; Fettweis, Xavier; Gregory, Jonathan M.; Lipscomb, William H.; van de Wal, Roderik S. W.; van den Broeke, Michiel R.

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.

Zitieren

Zitierform:

Goelzer, Heiko / Noël, Brice P. Y. / Edwards, Tamsin L. / et al: Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections. 2020. Copernicus Publications.

Zugriffsstatistik

Gesamt:
Volltextzugriffe:
Metadatenansicht:
12 Monate:
Volltextzugriffe:
Metadatenansicht:

Grafik öffnen

Rechte

Rechteinhaber: Heiko Goelzer et al.

Nutzung und Vervielfältigung:

Export