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The Cryosphere An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 3 | Copyright
The Cryosphere, 12, 811-831, 2018
https://doi.org/10.5194/tc-12-811-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Mar 2018

Research article | 06 Mar 2018

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

Brice Noël1, Willem Jan van de Berg1, J. Melchior van Wessem1, Erik van Meijgaard2, Dirk van As3, Jan T. M. Lenaerts4, Stef Lhermitte5, Peter Kuipers Munneke1, C. J. P. Paul Smeets1, Lambertus H. van Ulft2, Roderik S. W. van de Wal1, and Michiel R. van den Broeke1 Brice Noël et al.
  • 1Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands
  • 2Royal Netherlands Meteorological Institute, De Bilt, the Netherlands
  • 3Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark
  • 4Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, USA
  • 5Department of Geoscience & Remote Sensing, Delft University of Technology, Delft, the Netherlands

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.

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We present a detailed evaluation of the latest version of the regional climate model RACMO2.3p2 at 11 km resolution (1958–2016) over the Greenland ice sheet (GrIS). The model successfully reproduces the present-day climate and surface mass balance, i.e. snowfall minus meltwater run-off, of the GrIS compared to in situ observations. Since run-off from marginal narrow glaciers is poorly resolved at 11 km, further statistical downscaling to 1 km resolution is required for mass balance studies.
We present a detailed evaluation of the latest version of the regional climate model RACMO2.3p2...
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