Mechanisms of ENSO-Modulated Precipitation Seasonality in Southeastern China and Implications for Stalagmite δ18O Records

This dataset contains high-resolution stable oxygen (δ18O) and carbon (δ13C) isotope records from stalagmite YQ15-1, retrieved from Yongquan Cave in Jiujiang, Jiangxi Province, Southeastern China (29.61°N, 115.65°E). The 45-mm-long aragonite sample was collected in November 2015 from a site located deep within the cave system (~300 m from the entrance). A total of 245 carbonate powder samples were obtained via micromilling at 0.2 mm increments along the central growth axis, providing a temporal resolution of approximately 1–3 months per sample. Isotopic analysis was performed at the University of Innsbruck using a Thermo Fisher Deltaplus XL mass spectrometer coupled with a Gasbench II. Results are calibrated to the VPDB standard with analytical uncertainties (1σ). These records provide a precise terrestrial archive for evaluating ENSO-related hydroclimate variability and precipitation seasonality in the East Asian monsoon region from 1987 to 2015 CE.本数据集包含采自中国东南部江西省九江涌泉洞（29.61°N，115.65°E）的石笋YQ15-1的高分辨率稳定氧同位素（δ¹⁸O）与碳同位素（δ¹³C）记录。该长45毫米的文石样品于2015年11月采自洞穴系统深处（距洞口约300米）的采样点位。研究人员沿石笋中心生长轴以0.2毫米的步距进行微研磨，共获取245份碳酸盐粉末样品，单样品对应的时间分辨率约为1至3个月。同位素分析工作于奥地利因斯布鲁克大学完成，所用仪器为赛默飞世尔科技（Thermo Fisher）Deltaplus XL质谱仪，搭配Gasbench II气体预处理装置。分析结果以维也纳佩德贝箭石标准（VPDB）进行校准，分析不确定度为1σ。该套记录可为评估公元1987年至2015年东亚季风区与厄尔尼诺-南方涛动（ENSO）相关的水文气候变异性及降水季节特征提供高精度的陆地气候档案。