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The monthly precipitation samples have been taken at 8 sites(Ogawa Town, Utsunomiya City, Kumagaya City, Kashiwa City, Tsukuba City, Fukushima City, Matsumoto City and Kyoto City), and the stable isotope of oxygen and hydrogen of these rainfall samples were analyzed. As a result of correlation analysis, the stable isotopes (δ18O and δD) of precipitation and the elevation have a good negative correlation. Since the stable isotope ratio of monthly precipitation at each observation point varies almost same, it is assumed that the water vapor which is origin of rainfall is almost same at Kanto district, south Tohoku district and Chubu district (central Japan). The stable isotope ratios of precipitation at Ogawa, Utsunomiya, Kumagaya and Kashiwa are lowest in January 2013. In this period, heaviest snowfall occurred because of the passage of a Pacific Coast Low (nangan Low pressure). The isotope ratios of snowfall event typically are relatively low, hence the isotope ratios in this period might be low. However, in Fukushima and Matsumoto, the stable isotope ratios of monthly precipitation the previously mentioned month are not so low. It is different from the result of Kanto district. As a result of the temporal variation of weighted-mean annual isotope ratios of each site, the isotope ratios at Ogawa have shown a decreasing tendency. Recently, the rainfall event which show the high rainfall intensity is increasing, so the isotope ratios of precipitation might be changed affected by the rainfall intensity. In the case of Matsumoto should be explored in the future. Since it is expected that the isotope ratios of precipitation will be changed in future because of global climate change, the maintaining a continuous observational survey is critical.

nihon suimon kagakkaishi/nihon suimon kagaku kaishi

Characteristics of stable isotopes in precipitation at Kanto district, Fukushima City, Matsumoto City and Kyoto City—Variation of stable isotopes in precipitation due to climate change and prediction of its future—