我国岩溶碳汇和在非岩溶区播撒碳酸盐粉的碳中和潜力
Karst-related carbon sink and the carbon neutral potential by carbonate liming in non-karst areas in China
查看参考文献62篇
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文摘
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碳酸盐风化对大气CO_2的捕获是陆地碳汇的重要组成部分.我国岩溶地貌广泛分布,岩溶碳汇对我国实现"双碳"目标有较大意义,因而受到广泛关注.同时,由于碳酸盐的快速溶解动力学特性,在非岩溶区富含碳酸盐的土壤可产生类似于岩溶区的碳汇通量,因此碳酸盐粉末在非岩溶区的播撒具有巨大的碳中和潜力.本文利用高分辨率遥感和气象数据以及碳酸盐溶蚀平衡模型,对全国碳酸盐岩出露区岩溶碳汇通量进行了定量研究.结果表明,这个碳汇通量约为每年每平方公里6.93吨碳,岩溶区产生的总碳汇为每年1760万吨碳;而在非岩溶区播撒碳酸盐粉末可以增加每年3859万吨的碳汇.基于8个CMIP6模式的未来预测,从2015年到2060碳中和年,我国岩溶碳汇通量受到全球变化的影响将增加约每年每平方公里1吨碳,总碳汇增加约每年254万吨碳(+14.4%),而非岩溶区撒播碳酸盐粉的潜在碳中和潜力增加约每年697万吨碳(+18.1%).本研究表明岩溶碳汇对未来全球气候变化的负反馈以及非岩溶区撒播碳酸盐粉的巨大碳增汇潜力将有助于我国未来碳中和目标的实现. |
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其他语种文摘
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The carbon dioxide captured by carbonate weathering is an important part of the land carbon sink. The karst landform is widely distributed in China, and the karst-related carbon sink is of great significance to realizing the goal of "double carbon" in China, so it has attracted wide attention. The development of artificial controllable atmospheric CO_2 capture process is a significant measure to control the global climate and to tackle the greenhouse effect, and carbon sequestration technology based on enhanced weathering is an important new direction. The carbon capture process of carbonate weathering is sensitive to both climate and land use changes, and has great prospects for human utilization, but the control of carbonate weathering carbon sink still be limited to karst areas where carbonate rocks are distributed. Due to the rapid dissolution dynamics of carbonate, carbonate-rich soil in non-karst areas can produce carbon sink flux similar to that in karst areas, so the spreading of carbonate powder in non-karst areas could be developed as an enhanced weathering technology which may has a great potential for increasing carbon sequestration. This paper uses high-resolution remote sensing and meteorological data and carbonate dissolution equilibrium model to quantify the karst carbon sink flux in national carbonate exposed areas. To estimate the intensity of carbonate weathering carbon sink flux, the maximum potential dissolution formula of carbonate weathering (MPD, assuming that the chemical dissolution approaches to equilibrium), a NPP-based soil pCO_2 model and the common carbonate weathering-driven DIC carbon sink flux equation are applied. The results show that the carbon sink flux is about 6.93 t of carbon per square kilometer per year, and the total carbon sink generated in karst areas is 17.6 million tons of carbon per year. The provinces that generate the higher karstrelated carbon sink flux are occurred in the southeast of China, such as Jiangxi, Fujian and Guangdong, while the largest total carbon sink is captured in southwest China. Spreading carbonate powder in non-karst areas may increase 38.59 million tons per year in China, with the highest carbon sink increase potential occurring in the southeast. Based on the CMIP6 model, from 2015 to the 2060 carbon neutral year, the national flux of karst-related carbon sink increases by about 1 tonne of carbon per square kilometer per year, the total carbon sink increases by about 2.54 million tons of carbon (+14.4%) per year, and the potential sink of carbon in non-karst areas increases by about 6.97 million tonnes of carbon (+18.1%) per year. The model results further imply that the increasing runoff in China would be the major driving force for the total carbon sink enhancement. Meanwhile, due to the behaviour of carbonate weathering intensity and relevant carbon sink flux response to climate and land-use dynamics, the strategies to regulate the the future CO_2 sequestration (carbonate area or limed non-karst soils) should aim at different directions. For cold area (T<15°C), the best approach to keep the high carbon sink is to protect the natural vegetation cover or to reforest. By contrast, irrigation and catchment water management would be the rational CO_2 sequestration enhancement approaches in warm area (T>15°C). This study shows that the negative feedback of karst-related carbon sinks on future global climate change and the huge potential of carbon sequestration by carbonate liming in non-karst areas will contribute to the realization of the future carbon neutral goals in China. |
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来源
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科学通报
,2022,67(34):4116-4129 【核心库】
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DOI
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10.1360/TB-2022-0048
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关键词
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岩溶碳汇
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碳酸盐风化
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气候变化
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土地利用
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撒碳酸盐粉
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碳中和潜力
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地址
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1.
西南大学地理科学学院, 重庆, 400715
2.
中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0023-074X |
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学科
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地质学;环境科学基础理论 |
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基金
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中国科学院战略性先导科技专项
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国家自然科学基金
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文献收藏号
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CSCD:7382602
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