| DOI: | 10.5194/cp-14-697-2018
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| Scopus记录号: | 2-s2.0-85047982285
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| 论文题名: | The importance of snow albedo for ice sheet evolution over the last glacial cycle |
| 作者: | Willeit M.; Ganopolski A.
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| 刊名: | Climate of the Past
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| ISSN: | 18149324
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| 出版年: | 2018
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| 卷: | 14, 期:5 | | 起始页码: | 697
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| 结束页码: | 707
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| 语种: | 英语
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| Scopus关键词: | albedo
; climate modeling
; deglaciation
; glacier mass balance
; ice sheet
; Last Glacial
; Northern Hemisphere
; optical property
; snow
; solar radiation
; surface energy
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| 英文摘要: | The surface energy and mass balance of ice sheets strongly depends on the amount of solar radiation absorbed at the surface, which is mainly controlled by the albedo of snow and ice. Here, using an Earth system model of intermediate complexity, we explore the role played by surface albedo for the simulation of glacial cycles. We show that the evolution of the Northern Hemisphere ice sheets over the last glacial cycle is very sensitive to the representation of snow albedo in the model. It is well known that the albedo of snow depends strongly on snow grain size and the content of light-absorbing impurities. Excluding either the snow aging effect or the dust darkening effect on snow albedo leads to an excessive ice build-up during glacial times and consequently to a failure in simulating deglaciation. While the effect of snow grain growth on snow albedo is well constrained, the albedo reduction due to the presence of dust in snow is much more uncertain because the light-absorbing properties of dust vary widely as a function of dust mineral composition. We also show that assuming slightly different optical properties of dust leads to very different ice sheet and climate evolutions in the model. Conversely, ice sheet evolution is less sensitive to the choice of ice albedo in the model. We conclude that a proper representation of snow albedo is a fundamental prerequisite for a successful simulation of glacial cycles. © 2018 Author(s). |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/109564
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| Appears in Collections: | 影响、适应和脆弱性
气候变化事实与影响
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作者单位: | Potsdam Institute for Climate Impact Research, Potsdam, Germany
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| Recommended Citation: | |
Willeit M.,Ganopolski A.. The importance of snow albedo for ice sheet evolution over the last glacial cycle[J]. Climate of the Past,2018-01-01,14(5)
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