Hygroscopic properties of volcanic ash

Details Hygroscopic properties of volcanic ash Hygroscopic properties of volcanic ash

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3811802l&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 11, CiteID L11802

Physics

3

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Volcanic Effects (4301, 8409), Atmospheric Composition And Structure: Instruments And Techniques, Volcanology: Explosive Volcanism (4302)

Scientific paper

Limited observational data exists on the physical interactions between volcanic ash particles and water vapor; yet it is thought that these interactions can strongly impact the microphysical evolution of ash, with implications for its atmospheric lifetime and transport, as well as formation of water and ice clouds. In this study, we investigate for the first time, the hygroscopic properties of ultra-fine volcanic ash (<125 μm diameter) from the eruptions of Mt. St. Helens in 1980, El Chichón in 1982, Tungurahua in 2006, Chaitén in 2008, Mt. Redoubt in 2009, and Eyjafjallajökull in 2010. The hygroscopicity of the ash particles is quantified by their ability to uptake water and nucleate into cloud drops under controlled levels of water vapor supersaturation. Evidence presented strongly suggests that ash uptakes water efficiently via adsorption and a simple parameterization of ash hygroscopicity is developed for use in ash plume and atmospheric models.

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