气候变化领域集成服务门户(CCPortal): Diffuse emission of CO2 from the Langjiu Geothermal Field, Western Tibet

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DOI	10.1016/j.gexplo.2023.107219
	Diffuse emission of CO2 from the Langjiu Geothermal Field, Western Tibet
	Sun, Yutao; Guo, Zhengfu; Fortin, Danielle; Zhao, Wenbin; Cheng, Zhihui; Li, Jujing; Zhang, Yue
发表日期	2023
ISSN	0375-6742
EISSN	1879-1689
卷号	249
英文摘要	The Earth's carbon cycle is closely related to climate change and global environmental changes. Emissions of CO2 from the solid Earth to the atmosphere through geological carbon cycling are an important source of atmospheric carbon. Therefore, it is of great importance to understand the current volcanic flux of carbon to the atmosphere, along with the factors that control this flux, to analyse climate stability. The Langjiu (LJ) geothermal field, which is located in the western region of the Lhasa terrane, is one of the four geothermal power plants in the Tibetan Plateau. In this study, the CO2 emissions and genesis from the geothermal field were quantitatively estimated. The results of this study indicate that the natural CO2 diffuse emission fluxes before and after the geothermal exploitation were 20.0 and 38.7 g m(-2) d(-1), respectively. The intensity of diffuse emission is close to that of other global geothermal fields. The endogenous CO2 emissions have increased significantly after geothermal exploration, indicating a greater contribution of endogenous CO2 emissions in the LJ geothermal field. Further, faults in the geothermal field could act as conduits for gas emission. The He-C isotope coupling model indicates that the CO2 in the LJ geothermal field is of crustal origin and have the addition of mantle fluids. The N-2 in the LJ geothermal field is mainly of thermogenic origin. Our results show that natural CO2 emissions are an important source of CO2 input into the atmosphere. Although CO2 emissions can increase owing to anthropogenic activities (e.g. geothermal exploitation), natural CO2 emissions still have a high contribution to the atmosphere. The influence of natural CO2 emissions from the geothermal field should be assessed to achieve accurate CO2 inventories in geothermal settings.
关键词	Carbon dioxide Flux Langjiu
英文关键词	DEEP CARBON-CYCLE; VOLCANIC FIELD; GAS; SUBDUCTION; NITROGEN; INDIA; FLUX; GEOCHEMISTRY; HIMALAYAS; CONSTRAINTS
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000980412500001
来源期刊	JOURNAL OF GEOCHEMICAL EXPLORATION
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283375
作者单位	Hebei GEO University; Hebei GEO University; Hebei GEO University; Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; University of Ottawa; LingNan Normal University
推荐引用方式 GB/T 7714	Sun, Yutao,Guo, Zhengfu,Fortin, Danielle,et al. Diffuse emission of CO2 from the Langjiu Geothermal Field, Western Tibet[J],2023,249.
APA	Sun, Yutao.,Guo, Zhengfu.,Fortin, Danielle.,Zhao, Wenbin.,Cheng, Zhihui.,...&Zhang, Yue.(2023).Diffuse emission of CO2 from the Langjiu Geothermal Field, Western Tibet.JOURNAL OF GEOCHEMICAL EXPLORATION,249.
MLA	Sun, Yutao,et al."Diffuse emission of CO2 from the Langjiu Geothermal Field, Western Tibet".JOURNAL OF GEOCHEMICAL EXPLORATION 249(2023).