Article (Scientific journals)
Refreezing on the Greenland ice sheet: a comparison of parameterizations
Reijmer, C.; van den Broeke, M.; Fettweis, Xavier et al.
2012In The Cryosphere, 6, p. 743-762
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Abstract :
[en] Retention and refreezing of meltwater are acknowledged to be important processes for the mass budget of polar glaciers and ice sheets. Several parameterizations of these processes exist for use in energy and mass balance models. Due to a lack of direct observations, validation of these parameterizations is difficult. In this study we compare a set of 6 refreezing parameterizations against output of two Regional Climate Models (RCMs) coupled to an energy balance snow model, the Regional Atmospheric Climate Model (RACMO2) and the Modèle Atmosphérique Régional (MAR), applied to the Greenland ice sheet. In both RCMs, refreezing is explicitly calculated in a snow model that calculates vertical profiles of temperature, density and liquid water content. Between RACMO2 and MAR, the ice sheet-integrated amount of refreezing differs by only 4.9 mm w.e yr−1 (4.5 %), and the temporal and spatial variability are very similar. For consistency, the parameterizations are forced with output (surface temperature, precipitation and melt) of the RCMs. For the ice sheet-integrated amount of refreezing and its inter-annual variations, all parameterizations give similar results, especially after some tuning. However, the spatial distributions differ significantly and the spatial correspondence between the RCMs is better than with any of the parameterizations. Results are especially sensitive to the choice of the depth of the thermally active layer, which determines the cold content of the snow in most parameterizations. These results are independent of which RCM is used to force the parameterizations.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Reijmer, C.
van den Broeke, M.
Fettweis, Xavier  ;  Université de Liège - ULiège > Département de géographie > Topoclimatologie
Ettema, J.
Stap, L.
Language :
English
Title :
Refreezing on the Greenland ice sheet: a comparison of parameterizations
Publication date :
11 July 2012
Journal title :
The Cryosphere
ISSN :
1994-0416
eISSN :
1994-0424
Publisher :
Copernicus, Katlenberg-Lindau, Germany
Volume :
6
Pages :
743-762
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 July 2012

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