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- W4288987531 abstract "Recent developments in unmanned aerial vehicle (UAV) technology have made it possible to measure gas compositions in volcanic plumes using lightweight compact gas sensors. However, the differences in the responses of each gas sensor can be critical in estimating gas compositions based on regression scatter plots, particularly for small plumes emitted during volcanic unrest and non-eruption periods. Based on the laboratory experiments, we show that air blowers easily adjust sensor responses and improve correlation on regression scatter plots, allowing quick composition estimates without the use of mathematical applications. Applying our measurement system, lightweight compact gas sensors for H 2 S, SO 2 , CO 2 , and H 2 O, with air blowers suspended from a UAV, were used to determine the compositions of a small plume at Io-yama, Kirishima volcano, Japan. The compositions of the plume estimated by our system were reasonably consistent with those obtained by laboratory analysis of volcanic gas collected at ground level near the vent, with fluctuations in CO 2 ratios and lower H 2 O ratios, relative to other gases, being observed. For more accurate estimations of CO 2 and H 2 O concentrations, low humidity conditions at a distance from the fumarole are preferable for analysis of plumes diluted by ambient dry air. Our measurement system is simple, easy to set up, and useful for estimating the compositions of small passive fumarolic gas plumes during volcanic unrest and non-eruption periods, without mathematical applications." @default.
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- W4288987531 date "2022-08-01" @default.
- W4288987531 modified "2023-10-01" @default.
- W4288987531 title "A Simple Method for the Analysis of Fumarolic Gases Using Response-Adjusted Sensors with a UAV" @default.
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- W4288987531 doi "https://doi.org/10.20965/jdr.2022.p0620" @default.
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