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<p>Although the number of global water stable isotope databases (δ<sup>18</sup>O and δ<sup>2</sup>H) is growing, accessible groundwater stable isotope data on developing countries (<i>e.g</i>., Iran), are conspicuously lacking. To fill this gap, we conducted a sampling campaign during October 2023&#xa0;to measure δ<sup>18</sup>O and δ<sup>2</sup>H in 202 wells, springs, and qanats across 10 main aquifers in Iran. We also calculated the second-order water isotopic variables, namely deuterium-excess (D-excess) and line-conditioned excess (LC-excess), in the studied aquifers, which provide insight into precipitation production and dynamics. Additionally, we determined the local meteoric water line (LMWL) for each aquifer. δ<sup>2</sup>H, δ<sup>18</sup>O, D-excess, and LC-excess values in the studied aquifers varied from –79.21 to –27.81 (‰), –11.95 to –4.68 (‰), –5.99 to 24.26 (‰), and –8.18 to 4.37 (‰), respectively. Eight out of the 10 calculated LMWLs for the studied aquifers had a lower slope than the global meteoric water line. Our dataset offers new insights into hydro-meteorological and pollution pathways in the studied aquifers, which supply the water needs for over half of Iran’s population.</p>

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A Dataset of Water Stable Isotopes in Iran’s Main Aquifers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月30日

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  • Omid Karimi,
  • Roohollah Noori,
  • Saman Javadi,
  • Changhyun Jun,
  • Sayed M. Bateni,
  • Bahram Choubin,
  • Mojtaba Noury,
  • Mojtaba Heydarizad,
  • Peiman Kianmehr,
  • Qiuhong Tang,
  • Frederic Huneau,
  • Severin Pistre

摘要

Although the number of global water stable isotope databases (δ18O and δ2H) is growing, accessible groundwater stable isotope data on developing countries (e.g., Iran), are conspicuously lacking. To fill this gap, we conducted a sampling campaign during October 2023 to measure δ18O and δ2H in 202 wells, springs, and qanats across 10 main aquifers in Iran. We also calculated the second-order water isotopic variables, namely deuterium-excess (D-excess) and line-conditioned excess (LC-excess), in the studied aquifers, which provide insight into precipitation production and dynamics. Additionally, we determined the local meteoric water line (LMWL) for each aquifer. δ2H, δ18O, D-excess, and LC-excess values in the studied aquifers varied from –79.21 to –27.81 (‰), –11.95 to –4.68 (‰), –5.99 to 24.26 (‰), and –8.18 to 4.37 (‰), respectively. Eight out of the 10 calculated LMWLs for the studied aquifers had a lower slope than the global meteoric water line. Our dataset offers new insights into hydro-meteorological and pollution pathways in the studied aquifers, which supply the water needs for over half of Iran’s population.