气候变化领域集成服务门户(CCPortal): Constraining the sources and cycling of dissolved inorganic carbon in an alpine river, eastern Qinghai-Tibet Plateau

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DOI	10.1016/j.scitotenv.2023.166262
	Constraining the sources and cycling of dissolved inorganic carbon in an alpine river, eastern Qinghai-Tibet Plateau
	Wang, Wanfa; Zhong, Jun; Li, Si-Liang; Ulloa-Cedamanos, F.; Xu, Sen; Chen, Sainan; Lai, Manting; Xu, Sheng
发表日期	2023
ISSN	0048-9697
EISSN	1879-1026
卷号	901
英文摘要	It is generally acknowledged that riverine dissolved inorganic carbon (DIC) behaviors play a critical role in global carbon cycling and hence have an impact on climate change. However, little is known about the intricate DIC dynamics under various meteorological conditions in the alpine areas. Here, we investigated DIC biogeochemical processes in the Bailong River catchment, eastern Qinghai-Tibet Plateau (QTP), by combining measurements of major ions, stable and radioactive isotopic compositions of DIC (delta(CDIC)-C-13 and Delta(CDIC)-C-14), and physiographic parameters in the Bailong River catchment. Statistics and stoichiometry analyses suggest that multiple biogeochemical processes could affect carbon cycling in the Bailong River catchment. The old DIC with low Delta C-14 values ( 472.4 +/- 127.8 %, n = 3) and stoichiometry analysis of dissolved ions showed clear evidence that carbonate weathering is primarily responsible for water chemistry in the upstream (elevation >2000 m). However, upstream samples showed that d13CDIC increased between 5 % and 11 % from the theoretical mixing line, concomitant with increasing pH and decreasing pCO(2), suggesting that isotopic fractionation of DIC due to CO2 outgassing may be the primary cause of the increased d13CDIC values. Additionally, the higher Delta C-14 values ( 285.4 +/- 123.5 %, n = 12) in the downstream region below 2000 m suggest that allochthonous modern carbon had a great impact on DIC variations. The presence of younger DIC may have important implications for the interpretation of inorganic carbon age in downstream rivers. Our study demonstrates that physiographic conditions can regulate DIC behaviors, which can improve estimations of carbon yield and comprehension of global carbon cycle.
关键词	Physiographic conditions Carbonate weathering Carbon cycling Radiocarbon Qinghai-Tibet Plateau
英文关键词	CO2 CONSUMPTION; BIOGEOCHEMICAL CYCLES; ORGANIC-MATTER; CLIMATE-CHANGE; DIOXIDE; CHINA; BASIN; RATES; LAND; VARIABILITY
WOS研究方向	Environmental Sciences
WOS记录号	WOS:001069276200001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282828
作者单位	Guizhou University; Tianjin University; Charles Darwin University
推荐引用方式 GB/T 7714	Wang, Wanfa,Zhong, Jun,Li, Si-Liang,et al. Constraining the sources and cycling of dissolved inorganic carbon in an alpine river, eastern Qinghai-Tibet Plateau[J],2023,901.
APA	Wang, Wanfa.,Zhong, Jun.,Li, Si-Liang.,Ulloa-Cedamanos, F..,Xu, Sen.,...&Xu, Sheng.(2023).Constraining the sources and cycling of dissolved inorganic carbon in an alpine river, eastern Qinghai-Tibet Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,901.
MLA	Wang, Wanfa,et al."Constraining the sources and cycling of dissolved inorganic carbon in an alpine river, eastern Qinghai-Tibet Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 901(2023).