Applying the three-dimensional model ATHAM to volcanic plumes: Dynamic of large co-ignimbrite eruptions and associated injection heights for volcanic gases

Details Applying the three-dimensional model ATHAM to volcanic plumes: Dynamic of large co-ignimbrite eruptions and associated injection heights for volcanic gases Applying the three-dimensional model ATHAM to volcanic plumes: Dynamic of large co-ignimbrite eruptions and associated injection heights for volcanic gases

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3719807h&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 19, CiteID L19807

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Atmospheric Composition And Structure: Volcanic Effects (8409), Volcanology: Atmospheric Effects (0370), Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Computational Geophysics: Modeling (1952, 4255), Biogeosciences: Carbon Cycling (4806)

Scientific paper

Many of the past large volcanic eruptions like Tambora in 1815, Krakatau in 1835, and Pinatubo in 1991 were secondary so called co-ignimbrite eruptions that were forced over a large area instead of a point source as in the Plinian case. Previous modeling studies were based on one-dimensional plume models. We used the fully three-dimensional plume model ATHAM (Active Tracer High-Resolution Atmospheric Model) to investigate the dynamics and the resulting plume heights of co-ignimbrite eruptions in an idealized setup. Ash particles as well as a sulfur dioxide (SO2) tracer are included in the model. In the analysis we focus on the behavior of SO2 since the neutral buoyancy height is an ill-defined parameter for gravitationally settling particles. In contrast to Plinian plumes the co-ignimbrite plumes develop from multiple updrafts resulting in significantly reduced neutral buoyancy heights. At least a two-dimensional modeling framework is necessary to capture the relevant dynamical features.

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