2013 Fiscal Year Final Research Report
Remote temperature sensing on the fumarolic area using hydrogen isotopic compositions of molecular hydrogen in volcanic plume
| Project/Area Number |
23740399
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | Nagoya University (2012-2013)
Hokkaido University (2011) |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2013
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| Keywords | 同位体交換平衡 / 水素同位体 / 温度推定 / 安定同位体 / 火山ガス / 阿蘇山 / 大気中水素 / エトナ山 |
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| Research Abstract |
Molecular hydrogen (H2) in a high-temperature volcanic fumarole reach to the hydrogen isotope exchange equilibrium with co-existing fumarolic H2O under the outlet temperature of the fumarole. In this study, we applied hydrogen isotope exchange equilibrium of fumarolic H2 as a tracer for the remote temperature sensing on the fumarolic area in the 1st crater of Mt. Naka-dake, Aso volcano, Japan, where direct measurement on fumaroles was not practical, by deducing the hydrogen isotopic composition of fumarolic H2 remotely from those in volcanic plume. We estimated that the dD value of fumarolic H2 to be -172+-16 per mil vs. VSMOW and the apparent equilibrium temperature (AETD) to be 868+-97 degreeC using volcanic plume samples.
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