Contribution of CO₂ emitted to the atmosphere by diffuse degassing from volcanoes: The Furnas Volcano case study
by Fátima Viveiros; Carlo Cardellini; Teresa Ferreira; Catarina Silva
International Journal of Global Warming (IJGW), Vol. 4, No. 3/4, 2012

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.

Online publication date: Sat, 13-Dec-2014

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