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| Titel |
Ice sheet mass loss caused by dust and black carbon accumulation |
| VerfasserIn |
T. Goelles, C. E. Bøggild, R. Greve |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 5 ; Nr. 9, no. 5 (2015-09-22), S.1845-1856 |
| Datensatznummer |
250116852
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| Publikation (Nr.) |
 copernicus.org/tc-9-1845-2015.pdf |
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| Zusammenfassung |
| 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. |
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