Title

Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 1: Greenland (1958-2016)

Document Type

Article

Publication Date

1-1-2018

Publication Title

The Cryosphere

ISSN

1994-0416

Volume

12

Issue

3

DOI

10.5194/tc-12-811-2018

Abstract

We evaluate modelled Greenland ice sheet (GrIS) near-surface climate, surface energy balance (SEB) and surface mass balance (SMB) from the updated regional climate model RACMO2 (1958–2016). The new model version, referred to as RACMO2.3p2, incorporates updated glacier outlines, topography and ice albedo fields. Parameters in the cloud scheme governing the conversion of cloud condensate into precipitation have been tuned to correct inland snowfall underestimation: snow properties are modified to reduce drifting snow and melt production in the ice sheet percolation zone. The ice albedo prescribed in the updated model is lower at the ice sheet margins, increasing ice melt locally. RACMO2.3p2 shows good agreement compared to in situ meteorological data and point SEB/SMB measurements, and better resolves the spatial patterns and temporal variability of SMB compared with the previous model version, notably in the north-east, south-east and along the K-transect in south-western Greenland. This new model version provides updated, high-resolution gridded fields of the GrIS present-day climate and SMB, and will be used for projections of the GrIS climate and SMB in response to a future climate scenario in a forthcoming study.

Comments

B. Noël (Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands)
W. J. van de Berg (Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands)
J. M. van Wessem (Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands)
E. van Meijgaard (Royal Netherlands Meteorological Institute, De Bilt, the Netherlands)
D. van As (Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark)
J. T. M. Lenaerts (Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, USA)
S. Lhermitte (Department of Geoscience & Remote Sensing, Delft University of Technology, Delft, the Netherlands)
P. Kuipers Munneke (Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands)
C. J. P. P. Smeets (Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands)
L. H. van Ulft (Royal Netherlands Meteorological Institute, De Bilt, the Netherlands)
R. S. W. van de Wal (Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands)
M. R. van den Broeke (Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands

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Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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