Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8255
AuthorsRinaldi, A. P.* 
Vandemeulebrouck, J.* 
Todesco, M.* 
Fátima, V.* 
TitleEffects of atmospheric conditions on surface diffuse degassing
Issue Date20-Sep-2012
Series/Report no./117 (2012)
DOI10.1029/2012JB009490
URIhttp://hdl.handle.net/2122/8255
Keywordsdiffuse degassing
atmospheric pressure
numerical modeling
porous media
volcano monitoring
carbon dioxide
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
AbstractDiffuse degassing through the soil is commonly observed in volcanic areas and monitoring of carbon dioxide flux at the surface can provide a safe and effective way to infer the state of activity of the volcanic system. Continuous measurement stations are often installed on active volcanoes such as Furnas (Azores archipelago), which features low temperature fumaroles, hot and cold CO2 rich springs, and several diffuse degassing areas. As in other volcanoes, fluxes measured at Furnas are often correlated with environmental variables, such as air temperature or barometric pressure, with daily and seasonal cycles that become more evident when gas emission is low. In this work, we study how changes in air temperature and barometric pressure may affect the gas emission through the soil. The TOUGH2 geothermal simulator was used to simulate the gas propagation through the soil as a function of fluctuating atmospheric conditions. Then, a dual parameters study was performed to assess how the rock permeability and the gas source properties affect the resulting fluxes. Numerical results are in good agreement with the observed data at Furnas, and show that atmospheric variables may cause the observed daily cycles in CO2 fluxes. The observed changes depend on soil permeability and on the pressure driving the upward flux.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
2012JB009490-pip.pdf1.86 MBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

97
checked on May 25, 2017

Download(s)

24
checked on May 25, 2017

Google ScholarTM

Check

Altmetric