中文版 | English
Title

Groundwater Plays an Important Role in Controlling Riverine Dissolved Organic Matter in a Cold Alpine Catchment, the Qinghai-Tibet Plateau

Author
Corresponding AuthorMa, Rui
Publication Years
2023-02
DOI
Source Title
ISSN
0043-1397
EISSN
1944-7973
Volume59Issue:2
Abstract
In cold alpine areas, the hydrological control on dissolved organic matter (DOM) export in relation to permafrost distribution remains uncertain on a catchment scale. To address this, the seasonal variations in DOM chemical features of groundwater and stream water were examined from 2013 to 2019 in a representative catchment on the northeastern Qinghai–Tibet Plateau, which is covered by both permafrost (at elevations higher than 3,500 m a.s.l.) and seasonally frozen areas. The results show that the highest dissolved organic carbon (DOC) concentration occurred during the thawing period (April–May), while the highest DOC flux occurred during the thawed period (June–early October). In the permafrost area, the freeze–thaw process significantly influenced the groundwater flow paths and DOM. During the thawing period, with shallow groundwater flow path through the organic soil layer, the stream water DOM recharged by suprapermafrost groundwater was characterized by high aromaticity and high DOC concentrations. During the thawed period, the deepening groundwater flow path through the mineral layer and dilution by overland flow, resulted in low DOC concentrations and DOM with lower aromaticity in stream water. When groundwater flowed from the permafrost area into the porous aquifers in the seasonally frozen area, the groundwater flow path also affected DOM dynamics. The stream water at the catchment outlet, which received groundwater discharge from the porous aquifer, showed a lower peak DOC concentration, a higher proportion of protein-like DOM, and a higher contribution of cold season DOC flux to annual DOC flux when compared to the water flowing out from the permafrost area. Our work highlights the role of the thick, porous aquifer in the seasonally frozen area in regulating DOM export. The results suggest that the cold alpine area may exhibit a stronger positive feedback to climate warming than that in Arctic areas.
© 2023. American Geophysical Union. All Rights Reserved.
Keywords
URL[Source Record]
Indexed By
EI ; SCI
Language
English
SUSTech Authorship
Others
Funding Project
This research was financially supported by the National Natural Science Foundation of China (NSFC‐41772270), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA20100103), and the 111 Program (State Administration of Foreign Experts Affairs and the Ministry of Education of China, Grant B18049).
WOS Research Area
Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
WOS Subject
Environmental Sciences ; Limnology ; Water Resources
WOS Accession No
WOS:000949529900014
Publisher
EI Accession Number
20230913647545
EI Keywords
Aquifers ; Biogeochemistry ; Catchments ; Dissolution ; Feedback ; Groundwater resources ; Hydrogeology ; Organic carbon ; Permafrost ; Rivers ; Runoff ; Stream flow ; Thawing
ESI Classification Code
Waterways:407.2 ; Flood Control:442.1 ; Surface Water:444.1 ; Groundwater:444.2 ; Geology:481.1 ; Geochemistry:481.2 ; Fluid Flow, General:631.1 ; Control Systems:731.1 ; Biochemistry:801.2 ; Chemical Operations:802.3 ; Organic Compounds:804.1
ESI Research Field
ENVIRONMENT/ECOLOGY
Data Source
EV Compendex
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/519736
DepartmentSchool of Environmental Science and Engineering
Affiliation
1.School of Environmental Studies, China University of Geosciences, Wuhan, China
2.Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences, Wuhan, China
3.Now at School of Environmental Studies, China University of Geosciences, Wuhan, China
4.School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, China
Recommended Citation
GB/T 7714
Hu, Yalu,Ma, Rui,Sun, Ziyong,et al. Groundwater Plays an Important Role in Controlling Riverine Dissolved Organic Matter in a Cold Alpine Catchment, the Qinghai-Tibet Plateau[J]. WATER RESOURCES RESEARCH,2023,59(2).
APA
Hu, Yalu,Ma, Rui,Sun, Ziyong,Zheng, Yan,Pan, Zhao,&Zhao, Lusong.(2023).Groundwater Plays an Important Role in Controlling Riverine Dissolved Organic Matter in a Cold Alpine Catchment, the Qinghai–Tibet Plateau.WATER RESOURCES RESEARCH,59(2).
MLA
Hu, Yalu,et al."Groundwater Plays an Important Role in Controlling Riverine Dissolved Organic Matter in a Cold Alpine Catchment, the Qinghai–Tibet Plateau".WATER RESOURCES RESEARCH 59.2(2023).
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