Journal article

The variation of large-magnitude volcanic ash cloud formation with source latitude

Peter G Baines, Morgan T Jones, R Stephen J Sparks

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | AMER GEOPHYSICAL UNION | Published : 2008

Abstract

Very large magnitudes of explosive volcanic eruptions can produce giant ash clouds with diameters of hundreds to thousands of kilometers. These ash clouds are controlled by gravity and rotational forces, leading to a more radially constrained shape than clouds produced by smaller eruptions. Here we develop a dynamic model of the formation of large ash clouds that are produced by eruptions of constant intensity and finite duration, incorporating source latitude, eruption type, magnitude, and intensity. The cloud grows as a stratified intrusion in the stratosphere to an equilibrium shape that approximates an ellipsoid of revolution, rotating anticyclonically as a solid body, at sufficient larg..

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University of Melbourne Researchers