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<p>Historical reconstructions of fossil fuel carbon dioxide emissions are vital to setting emission mitigation strategies, and tree-ring radiocarbon analysis provides a reliable approach. However, residual radiocarbon from past nuclear tests can distort the signal, and regional variations beyond the well-known latitudinal gradient remain underexplored. Here we analyzed tree-ring radiocarbon records from Nanling (1921–2020, this study) and published datasets to identify spatial patterns of bomb-derived fallout in China from 1965 to 1985. Compared to latitudinal compilations and European backgrounds, radiocarbon enhancements extended up to 3000 km from test sites, highlighting the dominant role of source characteristics. We further demonstrate that re-release of bomb radiocarbon from terrestrial ecosystems prolongs its regional atmospheric residence time to 5–20 years, introducing spatial variability that biases fossil fuel carbon dioxide reconstructions up to 5.4 ppm. These findings underscore the need to integrate source-specific fallout and atmospheric transport into regional radiocarbon interpretation frameworks.</p>

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Continental-scale impact of bomb radiocarbon affects historical fossil fuel carbon dioxide reconstruction

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月29日

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  • Jing Li,
  • Nannan Wei,
  • Xu Wang,
  • Pingyang Li,
  • Yanmin Sun,
  • Wenbiao Feng,
  • Zhineng Cheng,
  • Sanyuan Zhu,
  • Weimin Wang,
  • Duohong Chen,
  • Shizhen Zhao,
  • Guangcai Zhong,
  • Guangyi Zhou,
  • Jun Li,
  • Gan Zhang

摘要

Historical reconstructions of fossil fuel carbon dioxide emissions are vital to setting emission mitigation strategies, and tree-ring radiocarbon analysis provides a reliable approach. However, residual radiocarbon from past nuclear tests can distort the signal, and regional variations beyond the well-known latitudinal gradient remain underexplored. Here we analyzed tree-ring radiocarbon records from Nanling (1921–2020, this study) and published datasets to identify spatial patterns of bomb-derived fallout in China from 1965 to 1985. Compared to latitudinal compilations and European backgrounds, radiocarbon enhancements extended up to 3000 km from test sites, highlighting the dominant role of source characteristics. We further demonstrate that re-release of bomb radiocarbon from terrestrial ecosystems prolongs its regional atmospheric residence time to 5–20 years, introducing spatial variability that biases fossil fuel carbon dioxide reconstructions up to 5.4 ppm. These findings underscore the need to integrate source-specific fallout and atmospheric transport into regional radiocarbon interpretation frameworks.