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<p>This study investigates stable isotopes based on 100 event-scale precipitation samples collected during four dry-to-wet transitional seasons in southwest China. Significant increasing trends in δD, δ<sup>1</sup>⁸O and D-excess were observed, driven primarily by increasing temperatures. The local meteoric water line (LMWL) indicated the dominance of continental moisture sources and the influence of below-cloud evaporation. Both the temperature effect and precipitation amount effect were pronounced, with local meteorology explaining approximately 50% of the isotopic variance. Dominant moisture shifted from high-latitude continental to near-source, amplifying isotopic variability while reducing D-excess value. These findings provide essential isotopic baselines for regional water cycle tracing during transitional seasons.</p>

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Isotope effects in precipitation linked to local meteorology and moisture source shifts during the dry-to-wet transitional seasons in a subtropical plain, southwest China

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Qiuyu Qiao,
  • Xuchenyu Liu,
  • Shisi Feng,
  • Guodong Liu,
  • Chengcheng Xia,
  • Xiaojie Zhong,
  • Junxi Lin,
  • Juping Huang,
  • Jie Wei

摘要

This study investigates stable isotopes based on 100 event-scale precipitation samples collected during four dry-to-wet transitional seasons in southwest China. Significant increasing trends in δD, δ1⁸O and D-excess were observed, driven primarily by increasing temperatures. The local meteoric water line (LMWL) indicated the dominance of continental moisture sources and the influence of below-cloud evaporation. Both the temperature effect and precipitation amount effect were pronounced, with local meteorology explaining approximately 50% of the isotopic variance. Dominant moisture shifted from high-latitude continental to near-source, amplifying isotopic variability while reducing D-excess value. These findings provide essential isotopic baselines for regional water cycle tracing during transitional seasons.