Volcanic CO2 mapping and flux measurements at Campi Flegrei by Tunable Diode Laser absorption Spectroscopy

Risultato della ricerca: Other contribution

Abstract

Near-infrared room-temperature Tunable Diode Lasers (TDL) have recently found increased usage in atmosphericchemistry and air monitoring research, but applications in Volcanology are still limited to a few examples.Here, we explored the potentiality of a commercial infrared laser unit (GasFinder 2.0 from Boreal Laser Ltd) tomeasurement of volcanic CO2 flux emissions. Our field tests were conducted at Campi Flegrei (near Pozzuoli,Southern Italy), where the GasFinder was used (during three campaigns in October 2012, January 2013 and May2013) to repeatedly measure the path-integrated concentrations of CO2 along cross-sections of the atmosphericplumes of the two main fumarolic fields in the area (Solfatara and Pisciarelli). By using ad-hoc designedfield-set-up and a tomographic post-processing routine, we resolved, for each of the 2 manifestations, the contourmaps of CO2 concentrations in their atmospheric plumes, from the integration of which (and after multiplicationby the plumes’ transport speeds) the CO2 fluxes were finally obtained [1]. The so-calculated fluxes averageof 490 tons/day, which agrees well with independent evaluations of Aiuppa et al. (2013) [2] (460 tons/day onaverage), and support a significant contribution of fumaroles to the total CO2 budget. The cumulative (fumarole[this study] +soil [2]) CO2 output from Campi Flegrei is finally evaluated at 1600 tons/day. The application oflasers to volcanic gas studies is still an emerging (though intriguing) research field, and requires more testing andvalidation experiments. We conclude that TDL technique may valuably assist CO2 flux quantification at a numberof volcanic targets worldwide.
Lingua originaleEnglish
Numero di pagine1
Stato di pubblicazionePublished - 2014

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