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DOI	10.5194/tc-11-1949-2017
	On the importance of the albedo parameterization for the mass balance of the Greenland ice sheet in EC-Earth
	Helsen M.M.; Van De Wal R.S.W.; Reerink T.J.; Bintanja R.; Madsen M.S.; Yang S.; Li Q.; Zhang Q.
发表日期	2017
ISSN	19940416
卷号	11 期号:4
英文摘要	The albedo of the surface of ice sheets changes as a function of time due to the effects of deposition of new snow, ageing of dry snow, bare ice exposure, melting and run-off. Currently, the calculation of the albedo of ice sheets is highly parameterized within the earth system model ECEarth by taking a constant value for areas with thick perennial snow cover. This is an important reason why the surface mass balance (SMB) of the Greenland ice sheet (GrIS) is poorly resolved in the model. The purpose of this study is to improve the SMB forcing of the GrIS by evaluating different parameter settings within a snow albedo scheme. By allowing ice-sheet albedo to vary as a function of wet and dry conditions, the spatial distribution of albedo and melt rate improves. Nevertheless, the spatial distribution of SMB in EC-Earth is not significantly improved. As a reason for this, we identify omissions in the current snow albedo scheme, such as separate treatment of snow and ice and the effect of refreezing. The resulting SMB is downscaled from the lowerresolution global climate model topography to the higherresolution ice-sheet topography of the GrIS, such that the influence of these different SMB climatologies on the longterm evolution of the GrIS is tested by ice-sheet model simulations. From these ice-sheet simulations we conclude that an albedo scheme with a short response time of decaying albedo during wet conditions performs best with respect to long-term simulated ice-sheet volume. This results in an optimized albedo parameterization that can be used in future EC-Earth simulations with an interactive ice-sheet component. © 2017 Author(s).
学科领域	albedo; climate modeling; Earth; global climate; ice sheet; mass balance; runoff; simulation; snow cover; spatial distribution; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	albedo; climate modeling; Earth; global climate; ice sheet; mass balance; runoff; simulation; snow cover; spatial distribution; Arctic; Greenland; Greenland Ice Sheet
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119471
作者单位	Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Royal Netherlands Meteorological Institute, De Bilt, Netherlands; Danish Meteorological Institute, Copenhagen, Denmark; Bolin Centre for Climate Research, Department of Physical Geography, Stockholm University, Stockholm, Sweden
推荐引用方式 GB/T 7714	Helsen M.M.,Van De Wal R.S.W.,Reerink T.J.,et al. On the importance of the albedo parameterization for the mass balance of the Greenland ice sheet in EC-Earth[J],2017,11(4).
APA	Helsen M.M..,Van De Wal R.S.W..,Reerink T.J..,Bintanja R..,Madsen M.S..,...&Zhang Q..(2017).On the importance of the albedo parameterization for the mass balance of the Greenland ice sheet in EC-Earth.Cryosphere,11(4).
MLA	Helsen M.M.,et al."On the importance of the albedo parameterization for the mass balance of the Greenland ice sheet in EC-Earth".Cryosphere 11.4(2017).