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Atmospheric process factors affecting the stable isotope variations in precipitation in Guiyang, Southwest China

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Abstract

The research on precipitation stable isotopes is beneficial for gaining insight into the water cycle in the monsoon region. However, the variability of monsoon and lack of high-resolution collection of precipitation stable isotopes in the monsoon region has been posing a limitation on learning the controlling factors on its variations. This study collects the daily precipitation stable isotopes in Guiyang from April 2022 to March 2023. The research results show that the precipitation stable isotopes display seasonal variations with the slope and intercept of the fitted local meteoric water line (LMWL) being 8.9 and 19.69, respectively. During the year, precipitation δ18O has a weak negative correlation with precipitation amount and temperature, but the correlation between precipitation δ18O and local environmental factors is not as significant as the one between precipitation δ18O and precipitation amount and outgoing longwave radiation (OLR) of the upstream area. During the monsoon season (MS), as the Intertropical Convergence Zone (ITCZ) migrates northward, the oceanic water vapor and upstream convective activity cause the decrease in precipitation stable isotopes. While during the non-monsoon season (NMS), the local circulation water vapor becomes the dominant water vapor source, leading to the increase in precipitation stale isotopes. The above studies demonstrate that water vapor sources and upstream convective activities play a critical role on variations of precipitation stable isotopes in Guiyang, which can provide basic information for future research on the water cycle in the monsoon region.

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The data used of this study are available from the corresponding author upon reasonable request.

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Funding

This study was supported by the National Natural Science Foundation of China (No. 42361010), the Guiding Fund Project of Government’s Science and Technology (No. Qian Ke He Zhong Yin Di [2023] 005), and the Academic Talent Plan of Guizhou Normal University (No. Qian Shi **n Miao [2022] B31).

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Contributions

All authors contributed to the study conception and design. Conceptualization: Ronghan Li and Dayun Zhu; Material preparation, data collection and analysis: Ronghan Li, Zhen Cao and Ju Ni; writing-original draft: Ronghan Li; Data curation: Yurong Han; visualization: Yurong Han and Ziqi Liu. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Dayun Zhu.

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The authors declare no competing interests.

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Li, R., Zhu, D., Han, Y. et al. Atmospheric process factors affecting the stable isotope variations in precipitation in Guiyang, Southwest China. Theor Appl Climatol 155, 3243–3257 (2024). https://doi.org/10.1007/s00704-023-04815-4

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  • DOI: https://doi.org/10.1007/s00704-023-04815-4

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