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Publication
Variações sazonais na monitorização contínua do fluxo de CO2 do solo no Vulcão das Furnas (ilha de São Miguel, Açores)
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Advisor(s)
Abstract(s)
Resumo: Diversos estudos têm demonstrado que variáveis ambientais (e.g.
meteorológicas) podem afetar a emissão de gases através dos solos, identificando, em alguns casos, variações sazonais na desgaseificação difusa de
CO2 em regiões vulcânicas. O presente estudo pretende complementar os
trabalhos realizados anteriormente no Vulcão das Furnas relacionados com
a desgaseificação difusa de CO2, tendo como principal objetivo confirmar
a existência de variações sazonais no fluxo deste gás. Para tal, foram
analisados os dados da estação permanente de fluxo de CO2 (GFUR2) entre
outubro de 2011 e março de 2015. As medições de fluxo de CO2 foram
realizadas através do método da câmara de acumulação. Os dados obtidos
sugerem a existência de variações sazonais, com registos de valores mais
elevados durante os meses de inverno quando comparados com os meses
de verão, confirmando assim a variação observada em trabalhos anteriores.
Abstract: Several studies have shown that environmental variables (e.g., meteorological) can highly affect gas emissions through soils, and some of them even identified seasonal variations in volcanic soil CO2 diffuse degassing areas. This study was performed at Furnas Volcano, one of the three centrals volcanoes located on São Miguel Island (Azores archipelago), not only to evaluate the existence of seasonal variations in the soil CO2 flux, but also to complement previous soil CO2 diffuse degassing works carried out in the area. The time series obtained between October 2011 and March 2015, at GFUR2 permanent station, was studied. Soil CO2 fluxes at this site are measured using the accumulation chamber method. Data acquired at GFUR2 station suggest the existence of seasonal variations, with higher soil CO2 fluxes values recorded during winter period when compared with summer period, confirming the behaviour previously observed.
Abstract: Several studies have shown that environmental variables (e.g., meteorological) can highly affect gas emissions through soils, and some of them even identified seasonal variations in volcanic soil CO2 diffuse degassing areas. This study was performed at Furnas Volcano, one of the three centrals volcanoes located on São Miguel Island (Azores archipelago), not only to evaluate the existence of seasonal variations in the soil CO2 flux, but also to complement previous soil CO2 diffuse degassing works carried out in the area. The time series obtained between October 2011 and March 2015, at GFUR2 permanent station, was studied. Soil CO2 fluxes at this site are measured using the accumulation chamber method. Data acquired at GFUR2 station suggest the existence of seasonal variations, with higher soil CO2 fluxes values recorded during winter period when compared with summer period, confirming the behaviour previously observed.
Description
Keywords
Fluxo de CO2 Desgaseificação difusa através dos solos Variações sazonais Vulcão das Furnas CO2 flux Soil diffuse degassing Seasonal variations Furnas Volcano
Citation
Pacheco et al. 2020, ‘Variações sazonais na monitorização contínua do fluxo de CO2 do solo no vulcão das Furnas (ilha de São Miguel, Açores)’, Comunicações Geológicas, vol. 107, nº 1 (especial), pp. 25-27.
Publisher
LNEG - Laboratório Nacional de Energia e Geologia