北海道，登別の降水の水素・酸素同位体比

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  • ホッカイドウ,ノボリベツ ノ コウスイ ノ スイソ ・ サンソ ドウイタイヒ
  • Hydrogen and Oxygen Isotopic Ratios of Precipitation at Noboribetsu, Hokkaido

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At Noboribetsu, Hokkido, hydrogen and oxygen isotopic ratios (δD and δ¹⁸O) of precipitation collected in about one month interval were measured from 1979 to 1983. Although the easurement is rather old, it is useful to explain the isotopic characteristics of precipitation in the southern coast area of Hokkaido. δD, δ¹⁸O and d value (d=δD－8δ¹⁸O) of annual mean precipitation at Noboribetsu are -60‰, -8.9‰ and 11, respectively. The relationships of δD and δ¹⁸O show obvious difference between winter season and spring to fall season, and the d value is 21 in the winter season and higher than the value of 9 in the spring to fall season, as like as the characteristics observed at Akita, Ryori and Rokkasho in the northern Honshu. The relationship in the spring to fall season is similar to those at Akita, Ryori and Rokkasho, and this implies that the Noboribetsu precipitation in the spring to fall season may be brought by the process similar to those in the above three localities. On the contrary, the relationship in the winter season is different from those of above three localities implying some difference in precipitation process. However, the d value of annual mean precipitation at Noboribetsu is the same as Ryori located at the Pacific Ocean coast of northern Honshu, because the precipitation amount in the winter season is fairly smaller than that in the spring to fall season at Noboribetsu as like as Ryori. The isotopic ratios of small revers in the Noboribetsu area are similar to those of several small rivers at the southern coast of Hokkaido, and this implies that the isotopic ratios of precipitation at the southern coast of Hokkaido have characteristics similar to those at Noboribetsu.

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