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Climate Variability Controls on CO2 Consumption Fluxes and Carbon Dynamics for Monsoonal Rivers: Evidence From Xijiang River, Southwest China
Jun Zhong;  Si-Liang Li;  Jing Liu;  Hu Ding;  Xiaole Sun;  Sheng Xu;  Tiejun Wang;  Rob M. Ellam;  Cong-Qiang Liu
2018
发表期刊Journal of Geophysical Research: Biogeosciences
卷号123期号:8页码:2553-2567
摘要

The feedbacks of climate variability on CO2 consumption fluxes and carbon dynamics are thought to play an important role in moderating the global carbon cycle. High-frequency sampling campaigns and analyses were conducted in this study to investigate temporal variations of river water chemistry and the impacts of climate variability on CO2 consumption fluxes and carbon dynamics for the Xijiang River, Southwest China. Physical processes modify biogeochemical processes, so major ions display different responses to changing discharge. The annual CO2 consumption rate is (6.8 +/- 0.2) x 10(6) ton/year by carbonate weathering and (2.4 +/- 0.3) x 10(6) ton/year by silicate weathering. The annual CO2 consumption flux is much higher than most world rivers, and strong CO2 consumption capacities are observed in catchments in Southwest China. Lower negative delta C-13(DIC) values are found in the high-flow season which corresponds with high temperatures compared to those in the low-flow season. High discharge will accelerate material transport, and high temperatures will increase primary production in the catchment, both of which can be responsible for the shift of delta C-13(DIC) values in the high-flow season. Increased mineral weathering and biological carbon influx in the catchment are the main factors controlling carbon dynamics. Overall, these findings highlight the sensitivity of CO2 consumption fluxes and carbon dynamics in response to climate variability in the riverine systems. 
Plain Language Summary There are feedbacks between climate variability and CO2 consumption fluxes by chemical weathering and carbon dynamics. Significant temporal variations of major ions and delta C-13(DIC) are observed in the Xijiang River. Multiple biogeochemical processes occur under various hydrological conditions, shifting major ions concentrations, and delta C-13(DIC). The annual CO2 consumption rate is (6.8 +/- 0.2) x 10(6) ton/year by carbonate weathering and (2.4 +/- 0.3) x 10(6) ton/year by silicate weathering. The annual CO2 consumption rates in the Xijiang River only account for a small fraction in the global CO2 consumption rates; the CO2 consumption capacity is much higher than the global average, while much lower than its source tributaries (Beipan and Nanpan Rivers). Slow subsurface flow paths with longer transit times switch to rapid near-surface flow paths with shorter transit times, as discharge increases. High temperatures increase reaction rates, and high discharge rates remove transport limitation, both of which would accelerate the chemical weathering rates. In the high-flow season, high discharge accompanying with high temperatures, large amounts of delta C-13-depleted biological carbon, flushes into the river, affecting the carbon dynamics.

收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8882
专题环境地球化学国家重点实验室
作者单位1.Institute of Surface-Earth System Science, Tianjin University, Tianjin, China
2.School of Management Science, Guizhou University of Finance and Economics, Guiyang, China
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Chin
4.Baltic Sea Center, Stockholm University, Stockholm, Sweden,
5.Scottish Universities Environmental Research Centre, University of Glasgow, East Kilbride, UK
推荐引用方式
GB/T 7714
Jun Zhong;Si-Liang Li;Jing Liu;Hu Ding;Xiaole Sun;Sheng Xu;Tiejun Wang;Rob M. Ellam;Cong-Qiang Liu. Climate Variability Controls on CO2 Consumption Fluxes and Carbon Dynamics for Monsoonal Rivers: Evidence From Xijiang River, Southwest China[J]. Journal of Geophysical Research: Biogeosciences,2018,123(8):2553-2567.
APA Jun Zhong;Si-Liang Li;Jing Liu;Hu Ding;Xiaole Sun;Sheng Xu;Tiejun Wang;Rob M. Ellam;Cong-Qiang Liu.(2018).Climate Variability Controls on CO2 Consumption Fluxes and Carbon Dynamics for Monsoonal Rivers: Evidence From Xijiang River, Southwest China.Journal of Geophysical Research: Biogeosciences,123(8),2553-2567.
MLA Jun Zhong;Si-Liang Li;Jing Liu;Hu Ding;Xiaole Sun;Sheng Xu;Tiejun Wang;Rob M. Ellam;Cong-Qiang Liu."Climate Variability Controls on CO2 Consumption Fluxes and Carbon Dynamics for Monsoonal Rivers: Evidence From Xijiang River, Southwest China".Journal of Geophysical Research: Biogeosciences 123.8(2018):2553-2567.
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