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| Titel |
A numeral model to simulate the chemical processing of volcanic ejecta in eruption plumes and clouds |
| VerfasserIn |
Gholam Ali Hoshyaripour, Matthias Hort, Guy Brasseur |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250122734
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| Publikation (Nr.) |
 EGU/EGU2016-1843.pdf |
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| Zusammenfassung |
| Volcanic eruptions inject tremendous amount of gases and particles into the atmosphere that
can notably affect different components of the climate system. The scale of such impacts
strongly depends on the eruption magnitude as well as the physicochemical properties of the
erupted material, which are mainly shaped during the atmospheric transport within
the eruption plume and cloud. For instance, the radiative forcing of an eruption
through backscattering the incoming solar radiation depends on the amount and
properties of the sulfate aerosols formed as the result of in-cloud processes including
chemical conversion of volcanic SO2 to sulfate. The rate, pathway and efficiency of
this conversion can therefore significantly influence the radiative forcing posed by
the eruption. Models that can simulate such in-plume and in-cloud processes are
rare.
Here we present the framework and initial results of a numerical model that
simulates the chemical interaction of gas, ash and aerosols within the volcanic eruption
plumes and clouds. The chemical mechanism takes into account the gaseous and
aqueous chemistry as well as the gas-aerosol partitioning within a fully-coupled
scheme. In other words, it is capable of modeling the changes in the gas, liquid and
solid phase separately as well as the interactions between phases. For instance,
the results show that the ash dissolution reduces the acidity of its liquid coating
and thus, enhances the scavenging of SO2 and HCl. The potential application of
the model in volcanology, geochemistry and atmospheric sciences are discussed. |
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