全球硅酸盐岩化学风化—二氧化碳消耗定量模型研究进展^*

Research progress on quantitative models of chemical weathering-carbon dioxide consumption of global silicate rocks

摘要

硅酸盐岩通过与二氧化碳的化学反应,去除大气二氧化碳并将其封存在风化产物或海洋碳酸盐岩中,是影响全球碳循环以及气候变化的要素之一。定量计算全球硅酸盐岩通过风化作用消耗的二氧化碳总量是了解地球现今与过去气候变化的关键。作者系统调研了5个硅酸盐岩化学风化—二氧化碳消耗定量模型的数据来源、研究方法、计算公式以及各模型的主要影响因素, 并且以最新的Celine模型所计算得出的二氧化碳消耗量为参考标准,对比了各模型的优缺点与适用范围。现有模型估计全球硅酸盐岩化学风化的二氧化碳消耗量为69~169 Tg/yr,其中各模型的主要参数包括气候(温度、径流)与岩性,次要参数包括构造隆升、火山与植物作用等。在未来探索硅酸盐岩化学风化所消耗二氧化碳的定量计算中,应考虑更多控制作用的影响以及各因素之间的相互联系。此外,利用大数据分析方法将这些定量模型推广应用于深时地球古气候重建可能是未来的研究趋势。

Abstract

Silicate rocks are factors that influence the global carbon cycle as well as climate change by chemically reacting with carbon dioxide,removing atmospheric carbon dioxide and sequestering it in weathering products or ocean carbonate rocks. Quantifying the total amount of carbon dioxide consumed by weathering of global silicate rocks is key to understanding the Earth’s current and past climate change. This paper systematically investigates the data sources,research methods,calculation formulas,and main influencing factors of five quantitative models of chemical weathering-CO₂ consumption of silicate rocks. The CO₂ consumption calculated by the latest Celine model serves as a reference standard for comparing the advantages,disadvantages and scope of application of each model. The existing models estimate the global carbon dioxide consumption of chemical weathering of rock silicate rocks to be 69-169 Tg/yr,in which the main parameters of each model include climate(temperature,runoff)and lithology,and the secondary parameters include tectonic uplift,volcanism and plant interaction. Future exploration of the quantitative calculation of carbon dioxide consumed by the chemical weathering of silicate rocks should consider more control effects and the interconnections between factors. In addition,the use of big data analysis methods to generalize these quantitative models to the reconstruction of the palaeoclimate of the deep earth may be a future research trend.

关键词

硅酸盐岩化学风化 / 二氧化碳消耗定量模型 / 全球碳循环 / 气候变化 / 古气候重建

Key words

chemical weathering of silicate rock / quantitative model of CO₂ consumption / global carbon cycle / climatic change / palaeoclimate reconstruction

基金资助

*国家自然基金青年项目(编号: 42202125)和“深时数字地球”(Deep-time Digital Earth)国际大科学计划联合资助