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Authors: Rizzo, A. L.* 
Jost, H.* 
Caracausi, A.* 
Paonita, A.* 
Liotta, M.* 
Martelli, M.* 
Title: Real-time measurements of the concentration and isotope composition of atmospheric and volcanic CO2 at Mount Etna (Italy)
Issue Date: 11-Apr-2014
Series/Report no.: /41 (2014)
DOI: 10.1002/2014GL059722
Keywords: Real-time data of CO2 content and δ13C in atmospheric/volcanic gases
This study opens new perspective for the community for volcanic surveillance
Subject Classification04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques 
05. General::05.02. Data dissemination::05.02.01. Geochemical data 
Abstract: We present unprecedented data of real-time measurements of the concentration and isotope composition of CO2 in air and in fumarole-plume gases collected in 2013 during two campaigns at Mount Etna volcano, which were made using a laser-based isotope ratio infrared spectrometer. We performed approximately 360 measurements/h, which allowed calculation of the δ13C values of volcanic CO2. The fumarole gases of Torre del Filosofo (2900mabove sea level) range from 3.24 ± 0.06‰to 3.71 ± 0.09‰, comparable to isotope ratio mass spectrometry (IRMS) measurements of discrete samples collected on the same dates. Plume gases sampled more than 1 km from the craters show a δ13C= 2.2 ± 0.4‰, in agreement with the crater fumarole gases analyzed by IRMS. Measurements performed along ~17km driving track from Catania to Mount Etna show more negative δ13C values when passing through populated centers due to anthropogenic-derived CO2 inputs (e.g., car exhaust). The reported results demonstrate that this technique may represent an important advancement for volcanic and environmental monitoring.
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