Title: Contribution of CO2 emitted to the atmosphere by diffuse degassing from volcanoes: The Furnas Volcano case study

Authors: Fátima Viveiros; Carlo Cardellini; Teresa Ferreira; Catarina Silva

Addresses: Centro de Vulcanologia e Avaliação de Riscos Geológicos, University of the Azores, Rua Mãe de Deus, Ponta Delgada 9501-801, Portugal ' Dipartimento di Scienze della Terra, Università di Perugia, Piazza Università, Perugia 06123, Italy ' Centro de Vulcanologia e Avaliação de Riscos Geológicos, University of the Azores, Rua Mãe de Deus, Ponta Delgada 9501-801, Portugal ' Centro de Vulcanologia e Avaliação de Riscos Geológicos, University of the Azores, Rua Mãe de Deus, Ponta Delgada 9501-801, Portugal

Abstract: Furnas Volcano is a dormant central volcano located in the eastern part of São Miguel Island (Azores archipelago, Portugal). The last volcanic eruption in this volcanic system took place in 1630 causing about 200 victims. Present-day activity comprises fumarolic fields, thermal and cold CO2-rich springs and soil diffuse degassing areas. CO2 diffusely released from the volcano soils was estimated at ∼0.4 Mt y-1. Only about 14% of this emission has a biogenic origin, the highest amount of the CO2 emitted being mantle derived. Hydrothermal CO2 released from Furnas Volcano is in the same order of magnitude as emissions from other volcanic-geothermal areas of the world. This work highlights the need to account for the natural CO2 emitted from quiescent volcanoes to refine the global carbon budget modelling.

Keywords: carbon dioxide; CO2; carbon emissions; carbon budget modelling; volcanic gases; hydrothermal manifestations; soil diffuse degassing; volcanism; quiescent volcanoes; Azores archipelago; global warming; Furnas Volcano; volcanic soil.

DOI: 10.1504/IJGW.2012.049444

International Journal of Global Warming, 2012 Vol.4 No.3/4, pp.287 - 304

Available online: 01 Oct 2012 *

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