Volcanic mesocyclones

  title={Volcanic mesocyclones},
  author={P. Chakraborty and G. Gioia and S. Kieffer},
A strong volcanic plume consists of a vertical column of hot gases and dust topped with a horizontal ‘umbrella’. The column rises, buoyed by entrained and heated ambient air, reaches the neutral-buoyancy level, then spreads radially to form the umbrella. In classical models of strong volcanic plumes, the plume is assumed to remain always axisymmetric and non-rotating. Here we show that the updraught of the rising column induces a hydrodynamic effect not addressed to date—a ‘volcanic mesocyclone… Expand