DOI: 10.1038/ngeo2180
论文题名: Contribution of light-absorbing impurities in snow to Greenland's darkening since 2009
作者: Dumont M. ; Brun E. ; Picard G. ; Michou M. ; Libois Q. ; Petit J.-R. ; Geyer M. ; Morin S. ; Josse B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 7 起始页码: 509
结束页码: 512
语种: 英语
Scopus关键词: absorbance
; albedo
; dark
; dust
; ice sheet
; numerical model
; satellite data
; satellite imagery
; snow cover
; solar radiation
; trend analysis
; warming
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: The surface energy balance and mass balance of the Greenland ice sheet depends on the albedo of snow, which governs the amount of solar energy that is absorbed. The observed decline of Greenland's albedo over the past decade has been attributed to an enhanced growth of snow grains as a result of atmospheric warming. Satellite observations show that, since 2009, albedo values even in springtime at high elevations have been lower than the 2003-2008 average. Here we show, using a numerical snow model, that the decrease in albedo cannot be attributed solely to grain growth enhancement. Instead, our analysis of remote sensing data indicates that the springtime darkening since 2009 stems from a widespread increase in the amount of light-absorbing impurities in snow, as well as in the atmosphere. We suggest that the transport of dust from snow-free areas in the Arctic that are experiencing earlier melting of seasonal snow cover as the climate warms may be a contributing source of impurities. In our snow model simulations, a decrease in the albedo of fresh snow by 0.01 leads to a surface mass loss of 27 Gt yr -1, which could induce an acceleration of Greenland's mass loss twice as large as over the past two decades. Future trends in light-absorbing impurities should therefore be considered in projections of Greenland mass loss. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106583
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Météo-France-CNRS, CNRM-GAME UMR 3589, CEN, Grenoble F-38000, France; Météo-France-CNRS, CNRM-GAME UMR 3589, GMGEC, Toulouse F-31057, France; Univ. Grenoble Alpes, LGGE UMR 5183, Grenoble F-38000, France; CNRS, LGGE UMR 5183, Grenoble F-38000, France
Recommended Citation:
Dumont M.,Brun E.,Picard G.,et al. Contribution of light-absorbing impurities in snow to Greenland's darkening since 2009[J]. Nature Geoscience,2014-01-01,7(7)