Articles | Volume 16, issue 14
Atmos. Chem. Phys., 16, 9399–9420, 2016
https://doi.org/10.5194/acp-16-9399-2016
Atmos. Chem. Phys., 16, 9399–9420, 2016
https://doi.org/10.5194/acp-16-9399-2016

Research article 28 Jul 2016

Research article | 28 Jul 2016

Adjusting particle-size distributions to account for aggregation in tephra-deposit model forecasts

Larry G. Mastin et al.

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AR by Larry Mastin on behalf of the Authors (12 Jun 2016)  Author's response    Manuscript
ED: Publish as is (14 Jun 2016) by Matthias Tesche
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Short summary
During volcanic eruptions, fine ash settles out of the atmosphere to form deposits. Particle aggregation makes it difficult for models to calculate where fine ash will fall. In this study we show that the Ash3d dispersion model can accurately predict where fine ash will land if one assumes a Gaussian size distribution of aggregates, ~ 0.18–0.23 mm in diameter and 600 kg m−3 in density. This aggregation scheme has optimally reproduced deposits for four well-documented eruptions.
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