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Ice sheet mass loss caused by dust and black carbon accumulation

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Title: Ice sheet mass loss caused by dust and black carbon accumulation
Authors: Goelles, T. Browse this author
Bøggild, C. E. Browse this author
Greve, R. Browse this author
Issue Date: 23-Apr-2015
Publisher: Copernicus Publications on behalf of the European Geosciences Union
Journal Title: The Cryosphere
Volume: 9
Issue: 5
Start Page: 1845
End Page: 1856
Publisher DOI: 10.5194/tc-9-1845-2015
Abstract: Albedo is the dominant factor governing surface melt variability in the ablation area of ice sheets and glaciers. Aerosols such as mineral dust and black carbon (soot) accumulate on the ice surface and cause a darker surface and therefore a lower albedo. The darkening effect on the ice surface is currently not included in sea level projections, and the effect is unknown. We present a model framework which includes ice dynamics, aerosol transport, aerosol accumulation and the darkening effect on ice albedo and its consequences for surface melt. The model is applied to a simplified geometry resembling the conditions of the Greenland ice sheet, and it is forced by several temperature scenarios to quantify the darkening effect of aerosols on future mass loss. The effect of aerosols depends non-linearly on the temperature rise due to the feedback between aerosol accumulation and surface melt. According to our conceptual model, accounting for black carbon and dust in future projections of ice sheet changes until the year 3000 could induce an additional volume loss of 7 %. Since we have ignored some feedback processes, the impact might be even larger.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Greve Ralf

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