Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/14184
Authors: Bini, Giulio* 
Chiodini, Giovanni* 
Lucchetti, Carlo* 
Moschini, Piergiorgio* 
Caliro, Stefano* 
Mollo, Silvio* 
Selva, Jacopo* 
Tuccimei, Paola* 
Galli, Gianfranco* 
Bachmann, Olivier* 
Title: Deep versus shallow sources of CO2 and Rn from a multi-parametric approach: the case of the Nisyros caldera (Aegean Arc, Greece)
Journal: Scientific Reports 
Series/Report no.: /10 (2020)
Publisher: Nature P.G.
Issue Date: 2020
DOI: 10.1038/s41598-020-70114-x
Abstract: Estimating the quantity of CO2 diffusively emitted from the Earth's surface has important implications for volcanic surveillance and global atmospheric CO2 budgets. However, the identification and quantification of non-hydrothermal contributions to CO2 release can be ambiguous. Here, we describe a multi-parametric approach employed at the Nisyros caldera, Aegean Arc, Greece, to assess the relative influence of deep and shallow gases released from the soil. In April 2019, we measured diffuse soil surface CO2 fluxes, together with their carbon isotope compositions, and at a depth of 80 cm, the CO2 concentration, soil temperature, and the activities of radon and thoron. The contributions of deep CO2 and biogenic CO2 fluxes were distinguished on the basis of their carbon isotope compositions. A Principal Component Analysis (PCA), performed on the measured parameters, effectively discriminates between a deep- and a shallow degassing component. The total CO2 output estimated from a relatively small testing area was two times higher with respect to that observed in a previous survey (October 2018). The difference is ascribed to variation in the soil biogenic CO2 production, that was high in April 2019 (a wet period) and low or absent in October 2018 (a dry period). Accounting for seasonal biogenic activity is therefore critical in monitoring and quantifying CO2 emissions in volcanic areas, because they can partially- or completely overwhelm the volcanic-hydrothermal signal.
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat
2020,Bini et al.,CO2RnNisyros,Sci Rep_10_13782.pdf9.69 MBAdobe PDFView/Open
Show full item record

WEB OF SCIENCETM
Citations

1
checked on Feb 7, 2021

Page view(s)

183
checked on Mar 27, 2024

Download(s)

21
checked on Mar 27, 2024

Google ScholarTM

Check

Altmetric