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- W3130263691 abstract "Volcanic ash clouds often become multilayered and thin with distance from the vent. We explore one mechanism for the development of this layered structure. We review data on the characteristics of turbulence layering in the free atmosphere, as well as examples of observations of layered clouds both near-vent and distally. We then explore dispersion models that explicitly use the observed layered structure of atmospheric turbulence. The results suggest that the alternation of turbulent and quiescent atmospheric layers provides one mechanism for the development of multilayered ash clouds by modulating vertical particle motion. The largest particles, generally μ>100 μm, are little affected by turbulence. For particles in which both settling and turbulent diffusion are important to vertical motion, mostly in the range of 10–100 μμm, the greater turbulence intensity and more rapid turbulent diffusion in some layers causes these particles to spend greater time in the more turbulent layers, leading to a layering of concentration. The results may have important implications for ash cloud forecasting and aviation safety." @default.
- W3130263691 created "2021-03-01" @default.
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- W3130263691 date "2021-02-23" @default.
- W3130263691 modified "2023-10-05" @default.
- W3130263691 title "The Development of Volcanic Ash Cloud Layers over Hours to Days Due to Atmospheric Turbulence Layering" @default.
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- W3130263691 doi "https://doi.org/10.3390/atmos12020285" @default.
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