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| Titel |
Initial fate of fine ash and sulfur from large volcanic eruptions |
| VerfasserIn |
U. Niemeier, C. Timmreck, H.-F. Graf, S. Kinne, S. Rast, S. Self |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 22 ; Nr. 9, no. 22 (2009-11-30), S.9043-9057 |
| Datensatznummer |
250007776
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| Publikation (Nr.) |
 copernicus.org/acp-9-9043-2009.pdf |
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| Zusammenfassung |
| Large volcanic eruptions emit huge amounts of sulfur and fine ash
into the stratosphere. These products cause an impact on radiative
processes, temperature and wind patterns. In simulations with a
General Circulation Model including detailed aerosol microphysics,
the relation between the impact of sulfur and fine ash is determined
for different eruption strengths and locations, one
in the tropics and one in high Northern latitudes. Fine ash with
effective radii between 1 μm and 15 μm has a
lifetime of several days only. Nevertheless, the strong absorption of
shortwave and long-wave radiation causes additional heating and
cooling of ±20 K/day and impacts the evolution of the
volcanic cloud. Depending on the location of the volcanic eruption,
transport direction changes due to the presence of fine ash, vortices
develop and temperature anomalies at ground increase. The results show
substantial impact on the local scale but only minor impact on the
evolution of sulfate in the stratosphere in the month after the simulated
eruptions. |
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