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

作者：Herzog Michael^*; Graf Hans F

来源：Geophysical Research Letters, 2010, 37(19): L19807.

DOI：10.1029/2010GL044986

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 (SO(2)) tracer are included in the model. In the analysis we focus on the behavior of SO(2) 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. Citation: Herzog, M., and H.-F. Graf (2010), Applying the three-dimensional model ATHAM to volcanic plumes: Dynamic of large co-ignimbrite eruptions and associated injection heights for volcanic gases, Geophys. Res. Lett., 37, L19807, doi:10.1029/2010GL044986.

• 出版日期2010-10-12