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Instituto de Investigação
em Vulcanologia e Avaliação de Riscos
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Artigos em livros de atas ► Nacionais


Referência Bibliográfica

VIVEIROS, F., FERREIRA, T., CARDELLINI, C., CALIRO, S., SILVA, C. (2011) - Soil CO2 emission to the atmosphere from Furnas Volcano (São Miguel Island, Azores archipelago). Proceedings of the Global Conference on Global Warming, Lisboa, 11-14 July 2011, pp. 347-355.


​Furnas Volcano is a dormant central volcano located in the eastern part of São Miguel Island (Azores archipelago, Portugal). At present secondary manifestations of volcanism comprise fumarolic fields, thermal and CO2 cold springs and soil diffuse degassing areas. More than two thousands soil CO2 flux measurements, based on the accumulation chamber method, were carried out at Furnas Volcano between 2005 and 2009 in order to produce CO2 degassing maps that show the spatial distribution of soil gas anomalies. CO2 flux values oscillated from non detectable to values higher than 25000 g m-2 d-1. On the basis of sequential Gaussian simulations, a mean CO2 emission of ~ 1110 t d-1 was estimated to be released from Furnas Volcano (area ~ 6.2 km2). From this total CO2 emitted, more than 80 % is of hydrothermal origin. This estimation represents only the diffusive contribution of the CO2 flux and do not account for other contributions from fumaroles, bubbling pools or Furnas lake, suggesting that the total CO2 emitted from Furnas Volcano ​is larger than our estimate.