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Bulletin Volcanologique

, Volume 45, Issue 3, pp 197–202 | Cite as

Les débits de CO2 et de SO2 volcaniques dans l’atmosphère

  • F. Le Guern
Article

Resume

La contribution des volcans à l’atmosphere est réévaluée à 5 107 tonnes de SO2 et 108 tonnes de CO2 par an.

Les volcans à laves fluides présentent des dégazages plus importants que les volcans à lave visqueuse: la convection du magma jouant un rôle très important dans les transferts de gaz vers la surface.

Ces valeurs de flux sont des minima: le soufre mesuré dans le panache étant le résidu des réactions survenues dans le sol et l’atmosphère; le CO2 mesuré dans le panache principal n’étant pas la seule source mesurable sur le terrain.

La contribution des éruptions volcaniques est négligeable vis à vis des contributions industrielles, mais peuvent par contre affecter la végétation ou les populations à proximité du volcan.

L’augmentation du débit gazeux précède la venue du magma dans le cas où la convection joue un rôle prédominant dans les transferts gazeux (Etna).

Dans le volcanisme acide par contre, les explosions surviennent au terme de périodes de débit très faible.

Abstract

Volcanic contribution to the atmosphere can be re-evaluated as 5×107 ton/year of CO2, which is less than recent industrial contribution.

Degassing is more abundant from volcanoes where magma convections are significant. Effective degassing occurs before the magma reaches the surface, that is, when the magma is fluid.

Volcanic gas in the atmosphere can affect the population or the vegetation around volcanoes.

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Copyright information

© Intern. Association of Volcanology and Chemistry of the Earth’s Interior 1982

Authors and Affiliations

  • F. Le Guern
    • 1
  1. 1.Centre des Faibles RadioactivitésC.N.R.S.Gif sur YvetteFrance

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