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<p>Atmospheric CO<sub>2</sub> variations across glacial-interglacial cycles are tightly linked to oceanic and terrestrial carbon reservoirs, but the contribution of weathering remains poorly constrained. Using a new PCM-weathering model (Past terrestrial Carbon storage Model coupling weathering sub-model), we reconstructed global silicate and carbonate weathering fluxes over the past 120,000&#xa0;years. Silicate weathering was higher during interglacials (~ 125–163 Tg C/yr) and lower at glacials (~ 119–122&#xa0;Tg C/yr), tracking atmospheric CO<sub>2</sub>. In contrast, carbonate weathering increased during glacials (~ 303–320 Tg C/yr) due to expanded land exposure resulting from glacial sea-level fall and declined at interglacials (~ 168–265 Tg C/yr). On glacial-interglacial timescales, total carbon consumption by silicate and carbonate weathering far exceeded changes in oceanic and terrestrial organic carbon pools. These results highlight a dynamic, compensatory balance between silicate and carbonate weathering in modulating Quaternary carbon fluxes.</p>

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The role of land weathering in carbon consumption and its impact on global carbon cycling since the Last Interglacial period

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月23日

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  • Shu Xu,
  • Haibin Wu,
  • Yue Yuan,
  • Lixin Chen,
  • Xingyue Huang,
  • Yanyan Yu,
  • Chunxia Zhang

摘要

Atmospheric CO2 variations across glacial-interglacial cycles are tightly linked to oceanic and terrestrial carbon reservoirs, but the contribution of weathering remains poorly constrained. Using a new PCM-weathering model (Past terrestrial Carbon storage Model coupling weathering sub-model), we reconstructed global silicate and carbonate weathering fluxes over the past 120,000 years. Silicate weathering was higher during interglacials (~ 125–163 Tg C/yr) and lower at glacials (~ 119–122 Tg C/yr), tracking atmospheric CO2. In contrast, carbonate weathering increased during glacials (~ 303–320 Tg C/yr) due to expanded land exposure resulting from glacial sea-level fall and declined at interglacials (~ 168–265 Tg C/yr). On glacial-interglacial timescales, total carbon consumption by silicate and carbonate weathering far exceeded changes in oceanic and terrestrial organic carbon pools. These results highlight a dynamic, compensatory balance between silicate and carbonate weathering in modulating Quaternary carbon fluxes.