Total CO2 output from fumaroles, soil gas, bubbling gas discharges and water dissolved gases dischargedfrom the island, was estimated for Vulcano island, Italy. The CO2 emission from fumaroles from the LaFossa summit crater was estimated from the SO2 crater output, while CO2 discharged through diffuse soilemission was quantified on the basis of 730 measurements of CO2 fluxes from the soil of the island, performedby using the accumulation chamber method. The results indicate an overall output of ≅500 t day 1of CO2 from the island. The main contribution to the total CO2 output comes from the summit area ofthe La Fossa cone (453 t day 1), with 362 t day 1 from crater fumaroles and 91 t day 1 from crater soildegassing. The release of CO2 from peripheral areas is ≅20 t day 1 by soil degassing (Palizzi and Istmo areasmainly), an amount comparable to both the contribution of water dissolved CO2 (6 t day 1), as well as toseawater bubbling CO2 (4 t day 1 measured in the Istmo area). Presented data (September 2007) refer to aperiod of moderate solphataric activity, when the fumaroles temperature were 450°C and gas/watermolar ratio of fumaroles was up to 0.16. The calculated total CO2 emission allows the estimation of the mass release and related thermal energy from the volcanic-hydrothermal system.
|Numero di pagine||19|
|Rivista||Geochemistry, Geophysics, Geosystems|
|Stato di pubblicazione||Published - 2012|
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