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To elucidate the mechanism for how the East Asian Monsoon (EAM)variability have influenced the isotope proxy records in Japan, weexplore the primary driver of variations of precipitation isotopesat multiple temporal scales (event, seasonal and inter-annual scales).Using a new 1-year record of the isotopic composition ofevent-based precipitation and continuous near-surfacewater vapor at Nagoya in central Japan, we identify the key atmosphericprocesses controlling the storm-to-storm isotopic variations throughan analysis of air mass sources and rainout history during the transportof moisture to the site, and then apply the identified processes toexplain the inter-annual isotopic variability related to the EAM variabilityin the historical 17-year long Tokyo station record inthe Global Network of Isotopes in Precipitation (GNIP).  In the summer, southerly flows transport moisture with higherisotopic values from subtropical marine regions and bring warm rainfallenriched with heavy isotopes.The weak monsoon summer corresponds to enriched isotopicvalues in precipitation, reflecting higher contribution of warm rainfall to thetotal summer precipitation.In the strong monsoon summer, the sustaining Baiu rainbandalong the southern coast of Japan prevents moisture transportacross Japan, so that the contribution of warm rainfall is reduced.In the winter, storm tracks are the dominant driver of storm-to-stormisotopic variation and relatively low isotopic values occur whena cold frontal rainband associated with extratropical cyclones passesoff to the south of the Japan coast.The weak monsoon winter is characterized by lower isotopes in precipitation, dueto the distribution of the cyclone tracks away from the southern coast of Japan.In contrast, the northward shift of the cyclone tracks and strongerdevelopment of cyclones during the strong monsoon wintersdecrease the contribution of cold frontal precipitation, resulting in higherisotopic values in winter precipitation.Therefore, year-to-year isotopic variability in summer and winter Japaneseprecipitation correlates significantly with changes in the East Asian summer and wintermonsoon intensity (<i>R</i>=-0.47 for summer, <i>R</i>=0.42 for winter), and thus we concludethat the isotope proxy records in Japan should reflect past changes in the East Asian Monsoon.Since our study identifies the climate drivers controlling isotopic variations in summer and winterprecipitation, we highlight the retrieval of a record with seasonal resolution from paleoarchivesas an important priority

East Asian Monsoon controls on the inter-annual variability in precipitation isotope ratio in Japan