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Journal Articles

Preliminary results of $$^{10}$$Be of the rock samples from the lake terrace of the Lake Pumayum Co in Tibetan Plateau

Nara, Fumiko*; Watanabe, Takahiro; Kokubu, Yoko; Horiuchi, Kazuho*

JAEA-Conf 2018-002, p.124 - 127, 2019/02

https://doi.org/10.11484/jaea-conf-2018-002

In-situ cosmogenic radionuclides have been used to understand earth surface processes, such as the erosion rate and exposure age dating of rocks. This is a preliminary report on in-situ $$^{10}$$Be values measurements by Accelerator Mass Spectrometry (AMS) for rock samples from the shore of the Lake Pumoyum Co in Tibetan plateau. The $$^{10}$$Be concentrations ranged from 5.5-7.5$$times$$10$$^{6}$$ atom/g similar to those of the surface sediments of Lake Pumoyum Co. The calculated erosion rates were 5.2-7.6 mm/kyr, values close to those previously reported by Lal et al. (2003).

Journal Articles

$$^{14}$$C concentration in tree rings of beech trees living near CO$$_{2}$$ vents in the Hakkoda Cardera, Aomori, Japan

Horiuchi, Kazuho*; Chiba, Takuji*; Hoshino, Yasuharu*; Oyama, Motonari*; Tanaka, Takayuki; Amano, Hikaru*

JAEA-Conf 2010-001, p.71 - 74, 2010/03

https://jopss.jaea.go.jp/pdfdata/JAEA-Conf-2010-001.pdf

We investigated how volcanic CO$$_{2}$$ emission affects the $$^{14}$$C concentrations in tree rings of beech trees in the Hakkoda Caldera in Aomori, which is one of high emission regions of volcanic CO$$_{2}$$ in the world. There was a tendency that the obtained $$^{14}$$C concentrations were, surprisingly, quite near to the values of the concurrent atmospheric CO$$_{2}$$ and decreased from 1991 to 2001. The $$^{14}$$C concentrations in caldera are lower than those of the control samples taken from a beech living outside of the caldera. We revealed the possibility that we can solve the local dynamics of fossil CO$$_{2}$$ emission using $$^{14}$$C in tree rings. However, the maximum difference of $$^{14}$$C between inside and outside of the caldera was 14 permil. This result showed that the volcanic CO$$_{2}$$ mixed with atmospheric CO$$_{2}$$ by 4.4 ppm or less. As the trunk absorbing CO$$_{2}$$ exist in height that is several meters higher than the volcanic CO$$_{2}$$ vents, the low mixing may occur.

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