Figure 3: Gravitational separation of particles in the event 5 volcanic plume from Redoubt Volcano.
From: Hail formation triggers rapid ash aggregation in volcanic plumes
(a) Time series showing maximum heights of the radar-detected plume (green circles) and modelled particles (lines). Mean radar heights derived from the highest-angle scan containing the cloud in plan view; error bars give maxima and minima. Solid line shows fine particles (≤250 μm); dashed shows coarse particles (≥500 μm), both at concentrations ≥10 mg m−3. (b) Modelled vertical distribution of mass at T=15 min, showing horizontally integrated mass of fine ash (solid) and hail (dot-dash).
