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

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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 CO
2
–rich springs and soil diffuse degassing areas. CO
2
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 CO
2
emitted being mantle derived. Hydrothermal CO
2
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 CO
2
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

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