Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3188
AuthorsDe Rosa, M.* 
Gagliardi, G.* 
Rocco, A.* 
Somma, R.* 
De Natale, P.* 
De Natale, G.* 
TitleContinuous in situ measurements of volcanic gases with a diode-laser-based spectrometer: CO2 and H2O concentration and soil degassing at Vulcano (Aeolian islands: Italy)
Issue Date2007
Series/Report no.5 / 8 (2007)
DOI10.1186/1467-4866-8-5
URIhttp://hdl.handle.net/2122/3188
Keywordsdiode-laser-based
degassing
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods 
04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques 
AbstractWe report on a continuous-measurement campaign carried out in Vulcano (Aeolian islands, Sicily), devoted to the simultaneous monitoring of CO2 and H2O concentrations. The measurements were performed with an absorption spectrometer based on a semiconductor laser source emitting around a 2-μm wavelength. The emitted radiation was selectively absorbed by two molecular ro-vibrational transitions specific of the investigated species. Data for CO2 and H2O concentrations, and CO2soil diffusive flux using an accumulation chamber configuration, were collected at several interesting sampling points on the island (Porto Levante beach- PLB, Fossa Grande Crater - FOG- and Valley of Palizzi, PAL). CO2/H2O values, measured on the ground, are very similar (around 0.019 (± 0.006)) and comparable to the previous discrete detected values of 0.213 (Fumarole F5 -La Fossa crater rim) and 0.012 (Fumarole VFS - Baia Levante beach) obtained during the 1977-1993 heating phase of the crater fumaroles. In this work much more homogeneous values are found in different points of the three sites investigated. The field work, although carried out in a limited time window (25th-28th August 2004), pointed out the new apparatus is suitable for continuous gas monitoring of the two species and their ratios, which are important geochemical indicators of volcanic activity, for which other reliable continuous monitoring systems are not yet available.
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