@article{oai:niigata-u.repo.nii.ac.jp:00002574,
 author = {狩野, 直樹 and 藍原, 弘行 and 小島, 令 and 竹内, 香代子 and 佐藤, 明史 and 今泉, 洋},
 issue = {2},
 journal = {Radioisotopes, Radioisotopes},
 month = {Feb},
 note = {新潟県の降水および河川水中の酸素安定同位体比(δ^<18>O)を1999年～2002年まで測定した。δ^<18>O値の測定は,安定同位体比測定用質量分析装置を用いて行われた。その結果,以下のことが明らかになった。(1)降水におけるδ^<18>O値の平均値は-9‰程度であり,季節によって±7‰程度の変動を示す,(2)新潟県内の各地点(9観測地点)において,同位体比の季節変動は,互いに似た挙動を示す,(3)降水におけるδ^<18>O値は,6月および1月において小さく,8月において大きい,(4)1月において,降水のδ^<18>O値と温度との間の相関関係が1年中で最も顕著に見られる,(5)冬期における降水のδ^<18>O値の変動幅は,他の季節より小さい,(6)新潟県の河川水におけるδ^<18>O値の平均値は,-11‰～-10‰程度であり,年間を通して大きな変動は見られなかった(±2‰程度),(7)河川水中のδ^<18>O値は,融雪水や降水が河川水中に流入するときに変動しうる,(8)地下水中のδ^<18>O値の変動幅は,河川水に比べて小さい。, Oxygen stable isotopic ratios (δ^<18>O) of the precipitation and some river water samples in Niigata prefecture were measured from 1999 to 2002. Isotopic measurements were performed by a stable isotope ratio mass spectrometer. Consequently, the following matters were found. (1) The mean δ^<18>O value of precipitations was -9‰, and the variation of ±7‰ was shown throughout the year. (2) All of 9 observation points, the seasonal behavior of isotopic ratio was similar to each other. (3) In June and January, δ^<18>O value of precipitations was small, and was large in August. (4) In January, the relationship between the temperature of observation points and δ^<18>O values in precipitation was most remarkably found throughout the year. (5) The variation of δ^<18>O values in precipitations in winter is smaller than that in the other seasons. (6) The mean δ^<18>O value of river waters in Niigata prefecture was about -11‰ to -10‰, and the variation was not so large (±2‰) throughout the year. (7) δ^<18>O values of river waters may vary when the melted snow or the precipitation flow into the rivers. (8) The variation of δ^<18>O values in groundwater was smaller than that in river waters. (Received August 22, 2002)},
 pages = {65--80},
 title = {酸素安同位体比から見た新潟県における近年の降水と河川水の特徴},
 volume = {52},
 year = {2003}
}