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Large scale modeling of the transport, chemical transformation and mass budget of the sulfur emitted during the April 2007 eruption of Piton de la Fournaise

by P. Tulet, N. Villeneuve
Atmospheric Chemistry and Physics ()

Abstract

In April 2007, the Piton de la Fournaise volcano (Reunion island)\nentered into its biggest eruption recorded in the last century. Due to\nthe absence of a sensors network in the vicinity of the volcano, an\nestimation of degassing during the paroxysmal phase of the event has not\nbeen performed. Nevertheless, the SO(2) plume and aerosols have been\nobserved by the OMI and CALIOP space sensors, respectively. The\nmesoscale chemical model MesoNH-C simulates the observed bulk mass of\nSO(2) and the general shape of the SO(2) plume spreading over the Indian\nOcean. Moreover, an analysis of the SO(2) plume budget estimates a total\nSO(2) release of 230 kt, among of which 60 kt have been transformed into\nH(2)SO(4). 27 kt of SO(2) and 21 kt of H(2)SO(4) have been deposited at\nthe surface by dry deposition. With this top down approach, the temporal\nevolution of the SO(2) emission has been estimated during the most\nactive period of the eruption. The peak of degassing was estimated at\n1800 kg s(-1) in the morning of 6 April. The temporal evolution of SO(2)\nemission presented here can also be used for local studies.

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