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<p>Clarifying the stable water isotope fractionation caused by water vapor sources is crucial for deepening our understanding of water cycle processes, particularly in special regions. This study analyzes the spatiotemporal characteristics of precipitation isotopes and water vapor source trajectories over the Yunnan-Guizhou Plateau based on five global climate models (GCMs). The results indicate that the local atmospheric waterline (LMWL) simulated by CAM2 and MIROC is closer to the measured results with δD = 8.43δ<sup>18</sup>O+15.75,δD = 8.69δ<sup>18</sup>O+15.12, respectively. The δ<sup>18</sup>O and δD of the five GCM simulations show seasonal variations of low summer and high winter, and are negatively correlated with temperature and precipitation; all GCM models except LMDZ (free) can show latitude effects; in terms of longitude, all models except the LMDZ model show lower δ<sup>18</sup>O values in the western Sect.&#xa0;(98°~105°E) than in the eastern Sect.&#xa0;(105°~112°E); combined with the results presented in the Taylor diagram, the isoGSM model performs best in simulating the isotopic composition of precipitation; the water vapor source analysis shows that the Indian Ocean-Bay of Bengal is the main source of water vapor in the Yunnan-Guizhou Plateau. This research provides irreplaceable value for our profound understanding and response to water resource management issues in the context of global change, and offers a basis for selecting applicable climate models.</p>

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Stable isotope simulation of precipitation and water vapor source analysis on the Yunnan-Guizhou plateau: based on the GCM model

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Tian Yin,
  • Fenli Chen,
  • Nan Kang,
  • Huizhen Li,
  • Yiwen Yao,
  • Xulin Li,
  • Shiyu Wang

摘要

Clarifying the stable water isotope fractionation caused by water vapor sources is crucial for deepening our understanding of water cycle processes, particularly in special regions. This study analyzes the spatiotemporal characteristics of precipitation isotopes and water vapor source trajectories over the Yunnan-Guizhou Plateau based on five global climate models (GCMs). The results indicate that the local atmospheric waterline (LMWL) simulated by CAM2 and MIROC is closer to the measured results with δD = 8.43δ18O+15.75,δD = 8.69δ18O+15.12, respectively. The δ18O and δD of the five GCM simulations show seasonal variations of low summer and high winter, and are negatively correlated with temperature and precipitation; all GCM models except LMDZ (free) can show latitude effects; in terms of longitude, all models except the LMDZ model show lower δ18O values in the western Sect. (98°~105°E) than in the eastern Sect. (105°~112°E); combined with the results presented in the Taylor diagram, the isoGSM model performs best in simulating the isotopic composition of precipitation; the water vapor source analysis shows that the Indian Ocean-Bay of Bengal is the main source of water vapor in the Yunnan-Guizhou Plateau. This research provides irreplaceable value for our profound understanding and response to water resource management issues in the context of global change, and offers a basis for selecting applicable climate models.