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- W2022254644 abstract "The theory of an in situ method to measure CO2 flux from hydrothermal fumarolic vents using a tracer gas technique is established and applied to vents and wells at three sites: Izu-Oshima (Japan), Kirishima (Japan) and Teide (Canary Islands, Spain) volcanoes. The method is done by releasing the tracer gas into the vent at known flux and by measuring CO2 to the tracer gas ratio in situ. In Izu-Oshima, we carried out flux measurements at a low-temperature steam well (90°C) with three different tracer gas species (H2, CH4 and SF6) and three methods (GC, portable analyzers, FTIR) to evaluate this method. The calculated CO2 flux showed an average of 2.3 t/day. In the case of Kirishima volcanic area, the flux measurement was tested at two low-temperature fumaroles on Iwoyama cone (<100°C). The CO2 fluxes were 9×10−2 and 2×100 kg/day, respectively. The total CO2 flux from the cone including both fumarolic and ground CO2 discharges was estimated to be less than several tons per day. In Teide volcano, CO2 flux measurements were performed in the fumarolic system of the summit crater (85°C). CO2 flux from one fumarole reached levels up to 30.2 kg/day. We estimated that the CO2 discharge from all fumaroles is roughly 30 t/day or less at maximum. These results imply that the total output of CO2 flux from Teide's fumarolic activity is much lower than the observed levels of CO2 diffuse degassing from the summit crater." @default.
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- W2022254644 date "2001-07-01" @default.
- W2022254644 modified "2023-10-12" @default.
- W2022254644 title "An in situ method for measuring CO2 flux from volcanic-hydrothermal fumaroles" @default.
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- W2022254644 doi "https://doi.org/10.1016/s0009-2541(00)00384-3" @default.
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