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To clarify the factors that control the temporal variation of stable isotope ratios in precipitation in the mountainous areas of Japan, monthly quantities of precipitation were collected at 11 locations on Mt. Ontake from Jan 2003 to Dec 2005, and the δ-values of all the water samples investigated. The isotope ratio values were found to be highest in spring, lowest in winter and moderate during the summer. These seasonal variations are unaffected by precipitation amount and temperature, indicating that the δ-values in precipitation at Mt. Ontake do not have a close relationship with local weather conditions. In the warm rainy season, low δ-values were observed in the precipitation when rainfall amount on the windward south side of Mt. Ontake was high, suggesting that the δ-values under such conditions depend on the rainfall amount in response to the vapor mass transportation from the Pacific coast towards Mt. Ontake. The low δ-values found for snow cover in winter reflect the influence of the inland effect, as heavier snow-fall occurred on the windward part of the mountains. These variations of δ-value appear associated with the topographical characteristic of Chubu mountainous area with a certain distance from the coast.

Temporal variation of stable isotope ratios in precipitation on Chubu-mountainous areas: a case study of Mt. Ontake, Japan