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| Titel |
The Aerosol Cloud of a large Volcanic Eruption: Simulation of Evolution and Climatic Influence |
| VerfasserIn |
U. Niemeier, C. Timmreck, J. S. Rast |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250025133
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| Zusammenfassung |
| Super eruptions exert an extreme forcing on the Earth System. The emitted volcanic
aerosol stays several years in the stratosphere, causing strong radiative effects with
consequences for atmospheric processes. The interactive simulation of formation, dispersal
and temporal development of a very large volcanic cloud is a challenging task for
every aerosol climate model. For our studies we use the middle atmosphere general
circulation model MAECHAM5 including the global aerosol module HAM. HAM
calculates the aerosol microphysics of sulfate and other species and their source
and sink processes. The model setup has been validated for the Pinatubo eruption,
showing good agreement with satellite data. The results show a realistic atmospheric
life cycle of the aerosols, including removal processes and the caused radiative
forcings.
The simulations are carried out for a possible Northern Hemisphere mid-latitude super
eruption located at Yellowstone National Park, because it seems to be one of the
most likely possible sites for such an event at higher latitudes, and for a tropical
one.
The discussion includes the evolution of the sulfate aerosol, the radiative forcing and
changes in atmospheric transport and circulation. We also show the influence of the model set
up, e.g. resolution, OH-limitation, on the results. |
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