Abstract. Lime is responsible for the continuous and stable absorption of CO₂ from the atmosphere during its cycle via the carbonation reaction. However, the magnitude of the global uptake of CO₂ by lime under natural conditions remains unclear. Here, existing data on materials associated with the production, utilisation, and disposal stages of lime-containing materials were analysed using a comprehensive model to obtain regional and global estimates for the sequestration of carbon from 1963 to 2020. The CO₂ emissions linked to the production of lime during the investigated period were also estimated. The results reveal that the global uptake of CO₂ by lime increased from 38.25 Mt (95 % confidence interval, CI:27.85-51.38 Mt) in 1963 to 134.33 Mt (95 % CI:90.37-139.29 Mt) in 2020. Cumulatively, approximately 4.05 Gt of CO₂ (95 % CI:3.02-5.25 Gt CO₂) were sequestered by lime produced between 1963 and 2020, and this amount corresponds to 38.79 % of CO₂ emissions from the associated process during the period. Lime-containing materials in China accounted for 63.12 % of the total uptake, and among the three stages of the lime cycle, the utilisation stage accounted for the highest CO₂ sequestration (~74.05 %). The results also demonstrate that lime, which is usually omitted from emission inventories as a carbon sink, is very important to the carbon cycle. The present study indicates that the CO₂ uptake by lime can reduce the carbon footprint of lime production process and provide scientific proof for further research of the potential of lime-containing materials in carbon capture and storage. The ** data utilised in the present study can be accessed at https://doi.org/10.5281/zenodo.7112485 (Ma, 2022)

中文翻译：

---

1963 年至 2020 年全球石灰吸收 CO2 的调查

摘要。石灰负责在其循环过程中通过碳酸化反应从大气中持续稳定地吸收 CO _{2 。}然而，在自然条件下石灰对 CO ₂的全球吸收量仍不清楚。_{在这里，使用综合模型分析了与含石灰材料的生产、利用和处置阶段}相关的材料的现有数据，以获得 1963 年至 2020 年碳封存的区域和全球估计值。还估算了调查期间的石灰产量。结果表明，全球对 CO _2的吸收石灰从 1963 年的 38.25 Mt（95 % 置信区间，CI：27.85-51.38 Mt）增加到 2020 年的 134.33 Mt（95 % CI：90.37-139.29 Mt）。累计约 4.05 Gt CO ₂（95 % CI： 3.02-5.25 Gt CO ₂ ) 被 1963 年至 2020 年间生产的石灰封存，这一数量相当于该期间相关工艺产生的 CO _{2排放量的 38.79%。}我国含石灰物料占总吸收量的63.12%，在石灰循环的三个阶段中，利用阶段CO _{2占比最高}封存（~74.05%）。结果还表明，通常作为碳汇从排放清单中省略的石灰对碳循环非常重要。本研究表明石灰吸收CO ₂可以减少石灰生产过程的碳足迹，并为进一步研究含石灰材料在碳捕获和储存中的潜力提供科学依据。本研究中使用的**数据可在 https://doi.org/10.5281/zenodo.7112485 (Ma, 2022) 访问