IUGG 2015. Session on Volcanic Ash Aggregation (VS21)
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Dear Colleagues,
We warmly invite interdisciplinary contributions to the following IAVCEI session at the 2015 IUGG General Assembly in Prague (22 June – 2 July, 2015):
VS21 Volcanic Ash Aggregation
This symposium focuses on processes that modify the transport and fallout of airborne volcanic ash, with particular emphasis on particle aggregation. We seek to bring together interdisciplinary advances from laboratory experiments, remote sensing, numerical models, and studies of the geological record that provide insights into the following processes:
Convenors1. Ash particle atmospheric lifetime linked to cloud microphysical processes (e.g., hydrometeor formation, water phase transitions, convective instabilities);
2. Recognition of aggregate structures in the geological record (including deposits from ancient/modern eruptions and meteorite impacts), and association with dynamic processes;
3. Contrasting sedimentation processes in weak vs. strong plumes, and phreatomagmatic vs. magmatic eruptions;
4. Electrical charging and lightning generation in volcanic clouds;
5. Direct observation, sampling and remote sensing of volcanic cloud properties and products (e.g., measurements of settling velocity, water content and changes in optical properties over time);
6. Mechanisms of particle binding (e.g., role of hydroscopic compounds, heating, ice formation, secondary precipitates, glass alteration);
7. Development of numerical models to describe particle aggregation;
8. Volcanic cloud stratification, and effects of gravitational versus advection-diffusion spreading.
Costanza Bonadonna (University of Geneva, Switzerland)
Adam Durant (University of Oslo, Norway)
Alexa Van Eaton (USGS Cascades Volcano Observatory)
Corrado Cimarelli (LMU Munich, Germany)
We look forward to seeing you in Prague!
All the best,
Alexa (for convenors)Volcano Listserv is a collaborative venture among Arizona State University (ASU), Portland State University (PSU), the Global Volcanism Program (GVP) of the Smithsonian Institution's National Museum of Natural History, and the International Association for Volcanology and Chemistry of the Earth's Interior (IAVCEI).
ASU - http://www.asu.edu/ PSU - http://pdx.edu/ GVP - http://www.volcano.si.edu/ IAVCEI - http://www.iavcei.org/
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