DOI: 10.5194/tc-11-1949-2017
Scopus记录号: 2-s2.0-85044078552
论文题名: On the importance of the albedo parameterization for the mass balance of the Greenland ice sheet in EC-Earth
作者: Helsen M ; M ; , Van De Wal R ; S ; W ; , Reerink T ; J ; , Bintanja R ; , Madsen M ; S ; , Yang S ; , Li Q ; , Zhang Q
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 4 起始页码: 1949
结束页码: 1965
语种: 英语
英文关键词: albedo
; climate modeling
; Earth
; global climate
; ice sheet
; mass balance
; runoff
; simulation
; snow cover
; spatial distribution
; Arctic
; Greenland
; Greenland Ice Sheet
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75629
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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
Recommended Citation:
Helsen M,M,, Van De Wal R,et al. On the importance of the albedo parameterization for the mass balance of the Greenland ice sheet in EC-Earth[J]. Cryosphere,2017-01-01,11(4)