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

by van de Berg, Willem Jan , van Wessem, J. Melchior , Kuipers Munneke, Peter , van Ulft, Lambertus H. , Noël, Brice , van As, Dirk , Lenaerts, Jan T. M. , van den Broeke, Michiel R. , van Meijgaard, Erik , Smeets, C. J. P. Paul , Lhermitte, Stef , van de Wal, Roderik S. W.

in Ablation / Albedo / Albedo (solar) / Climate / Climate models / Clouds / Drifting snow / Earth sciences & physical geography / Energy balance / Fields / Future climates / Glaciation / Glaciers / Greenland ice sheet / Heat / Ice / Ice melting / Ice sheets / Mass balance / Mass balance of ice sheets / Meteorological data / open climate campaign / Percolation / Physical, chemical, mathematical & earth Sciences / Physics / Physique, chimie, mathématiques & sciences de la terre / Precipitation / Regional climate models / Regional climates / Sciences de la terre & géographie physique / Simulation / Snow / Snowdrifts / Snowfall / Surface energy / Surface energy balance / Surface properties / Temporal variability / Temporal variations

2018

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

2018

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

2018

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Journal Article

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

van de Berg, Willem Jan,

van Wessem, J. Melchior,

Kuipers Munneke, Peter,

van Ulft, Lambertus H.,

Noël, Brice,

van As, Dirk,

Lenaerts, Jan T. M.,

van den Broeke, Michiel R.,

van Meijgaard, Erik,

Smeets, C. J. P. Paul,

Lhermitte, Stef,

van de Wal, Roderik S. W.

2018

Overview

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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Publisher

Copernicus GmbH,Copernicus Publications

Subject

/ Albedo

/ Climate

/ Clouds