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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

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.

Journal Articles

Re-$$^{14}$$C dating of wood fossils from the gravel beds at Sebadani, the upper reaches of Azusa River, central Japan

Oikawa, Teruki*; Sasao, Eiji; Hoshino, Yasuharu*

Dai Yonki Kenkyu, 47(6), p.425 - 431, 2008/12

The depositional age of gravel beds at the Sebadani, in the upper reaches of Azusa River at the Hida Mountain Range has been determined by AMS $$^{14}$$C dating. We measured the four new AMS $$^{14}$$C dating of wood fossils in the gravel beds of Sebadani. The previous study estimated that the formation age of this gravel beds is 70,000-50,000 yr BP which corresponds to marine isotope stage (MIS) 4. However, the new obtained ages were ${it ca}$. 48 ka BP from the wood fossils in the gravel beds.

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