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Journal article

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

Tulet P, Villeneuve N ...see all

Atmospheric Chemistry and Physics, vol. 11, issue 9 (2011) pp. 4533-4546

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Abstract

In April 2007, the Piton de la Fournaise volcano (Reunion island)
entered into its biggest eruption recorded in the last century. Due to
the absence of a sensors network in the vicinity of the volcano, an
estimation of degassing during the paroxysmal phase of the event has not
been performed. Nevertheless, the SO(2) plume and aerosols have been
observed by the OMI and CALIOP space sensors, respectively. The
mesoscale chemical model MesoNH-C simulates the observed bulk mass of
SO(2) and the general shape of the SO(2) plume spreading over the Indian
Ocean. Moreover, an analysis of the SO(2) plume budget estimates a total
SO(2) release of 230 kt, among of which 60 kt have been transformed into
H(2)SO(4). 27 kt of SO(2) and 21 kt of H(2)SO(4) have been deposited at
the surface by dry deposition. With this top down approach, the temporal
evolution of the SO(2) emission has been estimated during the most
active period of the eruption. The peak of degassing was estimated at
1800 kg s(-1) in the morning of 6 April. The temporal evolution of SO(2)
emission presented here can also be used for local studies.

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Authors

  • P. Tulet

  • N. Villeneuve

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