In:
The Cryosphere, Copernicus GmbH, Vol. 14, No. 6 ( 2020-06-02), p. 1747-1762
Abstract:
Abstract. 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.
Type of Medium:
Online Resource
ISSN:
1994-0424
DOI:
10.5194/tc-14-1747-2020
DOI:
10.5194/tc-14-1747-2020-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2020
detail.hit.zdb_id:
2393169-3