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Authors: Granieri, D.* 
Avino, R.* 
Chiodini, G.* 
Title: Carbon Dioxide Diffuse Emission from the Soil at Vesuvio and Campi Flegrei (Pozzuoli): Ten Years of Observations
Issue Date: 31-May-2010
Keywords: carbon dioxide
Campi Flegrei
Subject Classification04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniques 
04. 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 
Abstract: Carbon dioxide flux from the soil is regularly monitored in selected areas of Vesuvio and Solfatara (Campi Flegrei, Pozzuoli) with the main aim of investigating if the surface phenomena could provide information about the processes occurring at depth. Surveyed areas include 15 fixed points around the rim of Vesuvio and 71 fixed points in the floor of Solfatara crater, where soil CO2 flux is measured since 1998, at least once a month. In addition, two automatic permanent stations, located at Vesuvio and Solfatara, continually measure the CO2 flux and some environmental parameters that can potentially influence the CO2 diffuse degassing. We analysed, with statistical procedures, the feature of the acquired signals, evaluating the spatial and temporal variations of the CO2 degassing process. Series acquired by continuous stations are characterized by an annual periodicity that is related to the typical periodicities of some meteorological parameters (e.g., air temperature, air humidity, etc.). Such a kind of signal permits to define the “reference” level of the CO2 degassing process that diffusely affects the flanks and the base of the volcanoes. Conversely, series of CO2 flux data arising from periodic measurements over the arrays of Vesuvio and Solfatara, are less dependent on external factors such as meteorological parameters, local soil properties (porosity, hydraulic conductivity) and topographic effects (high or low ground). Therefore we argue that the longterm trend of this signal contains the “best” possible representation of the endogenous signal related to the upflow of deep hydrothermal fluids. At Vesuvio and Solfatara, the variations of these series have shown some correspondence with other physical changes of the volcanic systems.
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