Tephra fall simulation for the eruptions at Mt. Shinmoe-dake during 26-27 January 2011 with JMANHM

Abstract

The tephra fall caused by the eruptions at Mt. Shinmoe-dake during 26 to 27 January 2011 is simulated with Japan Meteorological Agency Non-Hydrostatic Model. The model has been improved so as to involve the tephra transport and sedimentation with four aerosol classes representing different sizes of tephra particles. The total mixing ratio and number concentration are prognosed with the advection, diffusion, and source and sink terms for each class. The simulated result on the distribution of tephra deposit shows a good agreement with observation.