Simulations and parameterisation of volcanic plumes observed in La Reunion Island, Piton de la Fournaise

Abstract : Piton de la Fournaise a volcano of altitude 2600 m a.s.l is located in Reunion Island in the Indian Ocean. With an average of on eruption every eight months, it’s amongst one of the world’s most active volcano. Volcanic ejecta, a mixture of tephra and gases are known to have considerable impact on the safety of air traffic and on human health. Acidic pollution created by the eruptions can be transported by wind over large distances. Uncertainties in modelling such transport demands continuous improvements in modelling techniques. This study aims to take a first step toward the development of a new volcano emissions alert notification system with a first application on the Piton de La Fournaise volcano. A critical factor in successfully monitoring and forecasting the dispersion of volcanic ash and gases relies on a correct identification of the height reached by eruption clouds. The objective of this study is to parameterise a volcanic convection in a mesoscale model (1 km resolution) initialised by heat sources prescribed at the ground. This is achieved by modifying a current shallow convection scheme used in a mesoscale model, Meso−NH. This modified parameterisation is validated by LES simulation considered as a reference. Having fulfilled the primary objective of this study, the modified scheme is tested as a first application in a 3D real−case environment.
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Sandra Gurwinder Sivia. Simulations and parameterisation of volcanic plumes observed in La Reunion Island, Piton de la Fournaise. Atmospheric and Oceanic Physics [physics.ao-ph]. Universite Toulouse III Paul Sabatier, 2014. English. ⟨tel-01188200⟩

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