Comparisons of Precipitation Isotopic Effects on Daily, Monthly and Annual Time Scales—A Case Study in the Subtropical Monsoon Region of Eastern China

The study on precipitation isotope variation can potentially improve the understanding of weather processes, regional water cycle and paleoclimate reconstruction in subtropical monsoon region. Based measured stable composition (δ18Op) daily from January 2010 to December 2021 Changsha region eastern China, δ18Op variations, amount effect local meteoric line (LMWL) were analyzed compared daily, monthly annual time scales, as well under different intensities. results showed that, scale, was significantly negatively correlated with area. Influenced by subcloud evaporation, small events (≤5 mm/d) could change rainout level isotopes. There significant differences slope intercept LMWL seasons On cold half year smaller larger than those warm year, respectively, increased intensity, then remained largely stable. year. possible reasons for scales are combined effects seasonal intensity vapor sources.