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In the Asian monsoon region, variations in the stable isotopic composition ofspeleothems have often been attributed to the "amount effect". However, anincreasing number of studies suggest that the "amount effect" in localprecipitation is insignificant or even non-existent. To explore this issuefurther, we examined the variability of daily stable isotopic composition(δ<sup>18</sup>O) in precipitation from September 2011 to November 2014 inNanjing, eastern China. We found that intra-seasonal variations ofδ<sup>18</sup>O during summer were not significantly correlated with localrainfall amount but could be linked to changes in the moisture sourcelocation and rainout processes in the source regions. Our findings suggestthat the stable isotopes in summer precipitation could signal the locationshift of precipitation source regions in the inter-tropical convergence zone(ITCZ) over the course of the monsoon season. As a result, changes inmoisture source location and upstream rainout effect should be taken intoaccount when interpreting the stable isotopic composition of speleothems inthe Asian monsoon region. In addition, the temperature effect on isotopicvariations in non-monsoonal precipitation should also be considered becauseprecipitation in the non-monsoon season accounts for about half of its annualprecipitation

Effects of changes in moisture source and the upstream rainout on stable isotopes in precipitation – a case study in Nanjing, eastern China