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<p>Precipitation stable isotopes are key tracers of orographic precipitation processes. However, isotopic observations in sharp basin–mountain transitions remain limited. This study investigates precipitation isotopes at three sites at different geomorphic units in Mengzi Karst Garden Basin. Precipitation isotopes were more depleted in&#xa0;the rainy season than&#xa0;in the dry season. Amount-weighted δ<sup>18</sup>O was significantly negatively (positively) correlated with the marine (continental) air-mass fraction. Relative humidity exerted a much stronger control on δ<sup>18</sup>O than temperature or precipitation Topographic uplift induced local meteorological changes that amplified the slope and intercept of the LMWLs, and also result in a pronounced altitude effect.</p>

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Circulation and topography modulated variations in precipitation isotopes across a sharp karst transition zone

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Weibin Ma,
  • Chengcheng Xia,
  • Tao Zhang,
  • Junxi Lin,
  • Junbing Pu

摘要

Precipitation stable isotopes are key tracers of orographic precipitation processes. However, isotopic observations in sharp basin–mountain transitions remain limited. This study investigates precipitation isotopes at three sites at different geomorphic units in Mengzi Karst Garden Basin. Precipitation isotopes were more depleted in the rainy season than in the dry season. Amount-weighted δ18O was significantly negatively (positively) correlated with the marine (continental) air-mass fraction. Relative humidity exerted a much stronger control on δ18O than temperature or precipitation Topographic uplift induced local meteorological changes that amplified the slope and intercept of the LMWLs, and also result in a pronounced altitude effect.