全球主要河流流域碳酸盐岩风化碳汇评估
Estimation of carbonate rock weathering-related carbon sink in global major river basins
查看参考文献46篇
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文摘
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碳酸盐岩风化吸收的大气CO_2主要以HCO_3~-形式连续地经由河流从大陆输送到海洋,成为陆地生态系统的重要碳汇。目前主要河流流域的碳酸盐岩风化碳汇估算存在不确定性,分布格局尚不清晰。基于GEMS-GLORI全球河流数据库提供的全球10万km~2以上主要河流流域多年平均监测数据,利用水化学径流法估算出全球主要河流流域碳酸盐岩对CO_2的吸收速率为0.43±0.15 Pg CO_2 yr~(–1),平均CO_2吸收通量为7.93±2.8 t km~(–2) yr~(–1)。CO_2吸收通量在不同气候带下差异显著,热带和暖温带CO_2年吸收速率占全球主要河流流域年吸收速率的62.95%。冷温带CO_2年吸收速率占全球主要河流流域的33.05%,仅次于热带地区。本文划分出全球CO_2吸收通量的9个关键带,关键带的交汇处CO_2吸收通量较高。喀斯特出露流域碳酸盐岩对CO_2吸收通量的均值为8.50 t km~(–2) yr~(–1),约为非喀斯特流域的3倍。全球喀斯特出露流域碳酸盐岩风化碳汇在全球碳循环、水循环及碳收支平衡估算研究方面占据重要地位。 |
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其他语种文摘
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Atmospheric CO_2 uptake by carbonate rock weathering is continuously transported from the land to the ocean by rivers in the form of HCO_3~–, and it has become an important carbon sink of terrestrial ecosystems. In the existing research, the estimation and distribution of carbonate weathering-related carbon sink in global major river basins are still unclear. In this study, we collect hydrochemical and discharge data of multiyear average (runoff modulus, main ion concentration, and dissolved inorganic carbon) in large river basins over 100, 000 km~2. By using hydrochem- discharge method, we estimate that the CO_2 uptake rates (Fv) of carbonate weathering in global major river basins is 0.43 ± 0.15 Pg CO_2 yr– 1 and the average CO_2 uptake flux(F) is 7.93 ± 2.8 t km~(– 2) yr ~(– 1). The CO_2 uptake F and uptake Fv are substantially different under various climatic zones. The annual uptake Fv of tropical and warm regions accounts for 62.95% of the total annual Fv. The cold temperate zone is widely distributed, and its CO_2 uptake Fv accounts for 33.05%, which is second only to the tropics. We also propose the nine critical zones of global CO_2 uptake F (four in the middle and low latitudes, two in the western hemisphere and three in the eastern hemisphere). The CO_2 uptake F in the intersection of the critical zones is high. The average CO_2 uptake F in the karst-outcropped basins is 8.50 t km~(–2) yr~(–1), which is approximately three times that in the non-karst basins. Carbonate weathering carbon sinks in global karst- outcropped basins play an important role in the study of global carbon cycle, water cycle, and carbon budget balance estimation. On the basis of river basin scales, various factors (e.g., carbonate composition, exogenous acid, and climatic environment) for carbonate weathering carbon sinks should be considered. The hydrochem- discharge method should be further improved in future research. Moreover, the effects of the photosynthesis of river aquatic organisms on rock weathering carbon sinks should be considered, and carbonate rock weathering carbon sinks should be refined and extrapolated to the world. |
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来源
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地理学报
,2019,74(7):1319-1332 【核心库】
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DOI
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10.11821/dlxb201907004
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关键词
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碳酸盐岩
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碳汇评估
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全球主要河流流域
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水化学径流法
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地址
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1.
贵州师范大学地理与环境科学学院, 贵阳, 550025
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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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中国科学院普定喀斯特生态系统观测研究站, 中国科学院普定喀斯特生态系统观测研究站, 普定, 562100
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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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0375-5444 |
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学科
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地质学 |
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基金
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喀斯特科学研究中心联合基金项目
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国家重点研发计划
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中国科学院“西部之光”人才培养计划A类(2018)
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中国科学院科技服务网络计划
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国际合作局国际伙伴计划
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贵州省高层次创新型人才培养计划“十”层次人才项目
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国家自然科学基金项目
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贵州省项目
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文献收藏号
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CSCD:6540729
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