气候变化领域集成服务门户(CCPortal): Dissolved inorganic carbon budget of two alpine catchments in the central Tibetan Plateau: Glaciation matters

CCPortal

DOI	10.1016/j.scitotenv.2023.165191
	Dissolved inorganic carbon budget of two alpine catchments in the central Tibetan Plateau: Glaciation matters
	Yu, Zhengliang; Li, Jianhong; Wu, Guangjian; Qu, Dongmei; Wang, Fei; Ming, Xiaoxing; Qiu, Haiying; Liu, Zhu; Maurischat, Philipp
发表日期	2023
ISSN	0048-9697
EISSN	1879-1026
卷号	898
英文摘要	Dissolved inorganic carbon (DIC) fluxes account for over one-third of the total carbon transported in most rivers. The DIC budget for glacial meltwater of the Tibetan Plateau (TP), however, is still poorly understood, despite the fact, the TP has the largest glacier distribution outside of the Poles. In this study, the Niyaqu and Qugaqie catchments in the central TP were selected to examine the influence of glaciation on the DIC budget in vertical evasion (CO2 exchange rate at the water-air interface) and lateral transport (sources and fluxes) from 2016 to 2018. Significant seasonal variation in DIC concentration was found in the glaciated Qugaqie catchment, but was absent in the not glaciated Niyaqu catchment. delta C-13(DIC) showed seasonal changes for both catchments, with more depleted signatures during the monsoon season. The average CO2 exchange rates in river water of Qugaqie were similar to 8 times lower compared to Niyaqu with values of -1294.6 & PLUSMN; 438.58 mg/m(2)/h and -163.4 & PLUSMN; 581.2 mg/m(2)/h, respectively, indicating that proglacial rivers can act as a substantial CO2 sink due to CO2 consumption by chemical weathering. DIC sources were quantified via the MixSIAR model using delta C-13(DIC) and ionic ratios. During the monsoon season, the contribution from carbonate/silicate weathering driven by atmospheric CO2 was 13-15 % lower, while biogenic CO2 involved in chemical weathering was 9-15 % higher, indicating a seasonal control on weathering agents. Carbonate dissolution driven by H2SO4/HNO3 was the most important contributor to DIC in both catchments (40.7 & PLUSMN; 2.2 % in Niyaqu and 48.5 & PLUSMN; 3.1 % in Qugaqie). The net CO2 consumption rate in the not glaciated Niyaqu catchment was close to 0 (-0.07 & PLUSMN; 0.04 x 10(5) mol/km(2)/y), indicating the carbon sink effect caused by chemical weathering in this area was weak. The net CO2 consumption rate in the glaciated Qugaqie catchment, however, was much lower than that in the not glaciated catchment with a value of -0.28 & PLUSMN; 0.05 x 10(5) mol/km(2)/y. This study highlights that chemical weathering in small glaciated catchments of the central TP plays an active role in releasing CO2 to the atmosphere.
关键词	Chemical weathering DIC CO2 exchange rate Cryosphere High Asia
英文关键词	GREENLAND ICE-SHEET; MAJOR ION CHEMISTRY; NAM CO BASIN; ISOTOPE FRACTIONATION; WATER GEOCHEMISTRY; DIOXIDE EMISSIONS; RIVER SYSTEM; GLACIER; CLIMATE; DELTA-C-13
WOS研究方向	Environmental Sciences
WOS记录号	WOS:001047329600001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283810
作者单位	Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Karst Geology, Chinese Academy of Geological Sciences; Shanxi Normal University; China University of Geosciences - Beijing; Hunan Institute of Science & Technology; Carl von Ossietzky Universitat Oldenburg
推荐引用方式 GB/T 7714	Yu, Zhengliang,Li, Jianhong,Wu, Guangjian,et al. Dissolved inorganic carbon budget of two alpine catchments in the central Tibetan Plateau: Glaciation matters[J]. 中国科学院青藏高原研究所,2023,898.
APA	Yu, Zhengliang.,Li, Jianhong.,Wu, Guangjian.,Qu, Dongmei.,Wang, Fei.,...&Maurischat, Philipp.(2023).Dissolved inorganic carbon budget of two alpine catchments in the central Tibetan Plateau: Glaciation matters.SCIENCE OF THE TOTAL ENVIRONMENT,898.
MLA	Yu, Zhengliang,et al."Dissolved inorganic carbon budget of two alpine catchments in the central Tibetan Plateau: Glaciation matters".SCIENCE OF THE TOTAL ENVIRONMENT 898(2023).