Publication Date:
2017-04-04
Description:
Near-infrared room temperature tunable diode lasers(TDL) have recently found increased usage in atmospheric chemistry and air monitoring research, but applications in
volcanology are still limited to a few examples. Here, we explored the potential of a commercial infrared laser unit
(GasFinder 2.0 from Boreal Laser Ltd) for measurement of volcanic CO2 mixing ratios, and ultimately for estimating the
volcanic CO2 flux. 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 May 2013 to repeatedly measure the path-integrated
mixing ratios of CO2 along cross sections of the atmospheric plumes of two major fumarolic fields (Solfatara and
Pisciarelli). By using a tomographic post-processing routine, we resolved, for each of the two fields, the contour maps of
CO2 mixing ratios in the atmosphere, from the integration of which (and after multiplication by the plumes’ transport
speeds) the CO2 fluxes were finally obtained. We evaluate a total CO2 output from the Campi Flegrei fumaroles of
∼490 Mg/day, in line with independent estimates based on in situ (Multi-GAS) observations. We conclude that TDL
technique may enable CO2 flux quantification at other volcanoes worldwide.
Description:
1- Progetto V2 “Precursori” DPC-INGV
research agreement 2012-2013; 2- Miur (PRIN 2009; PI M.V.), and 3-European Research Council under the European Union’s Seventh
Framework Programme (FP7/2007/2013)/ERC grant agreement n1305377 (PI, A.A).
Description:
Published
Description:
812
Description:
2V. Dinamiche di unrest e scenari pre-eruttivi
Description:
5V. Sorveglianza vulcanica ed emergenze
Description:
JCR Journal
Description:
restricted
Keywords:
Tunable diode lasers
;
Atmospheric CO2 monitoring
;
gas sensing
;
spectroscopy
;
Volcanic CO2 fluxes
;
Campi Flegrei
;
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
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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