DOI: 10.1016/j.scitotenv.2019.134480
论文题名: Understanding the inorganic carbon transport and carbon dioxide evasion in groundwater with multiple sulfate sources during different seasons using isotope records
作者: Wen J. ; Tang C. ; Cao Y. ; Li X.
刊名: Science of the Total Environment
ISSN: 489697
出版年: 2020
卷: 710 语种: 英语
英文关键词: DIC transport and CO2 evasion
; Sulfate isotopic evolution
; The AMD-affected riparian zone
; δ13C-DIC fractionation
Scopus关键词: Agriculture
; Aquifers
; Atmospheric movements
; Geochemistry
; Groundwater flow
; Groundwater resources
; Isotopes
; Pyrites
; Sewage
; Sulfur compounds
; Anthropogenic activity
; DIC transport and CO2 evasion
; Dry and wet seasons
; Global carbon cycle
; Isotopic characteristics
; Isotopic fractionations
; Riparian zones
; Sulfate isotopic evolution
; Carbon dioxide
; carbon cycle
; carbon dioxide
; geochemical cycle
; groundwater
; inorganic carbon
; isotopic analysis
; isotopic fractionation
; seasonal variation
; source apportionment
英文摘要: The geochemical cycle of carbon under anthropogenic activities controls the transport of carbon between surface sediments, hydrosphere and atmosphere, especially for atmospheric and marine carbon dioxide. Currently, the anthropogenically-induced carbon cycle in groundwater is an important part of the cycle in inland waters and cannot be underestimated as a geochemical process affecting the global carbon cycle. Therefore, there is a need to conduct deep research using isotopes in which the isotopic mixing and fractionation response to the carbon cycle can be assessed. The results showed that the δ34S-SO4 2− and δ18O-SO4 2− values in groundwater inherited the isotopic characteristics of four sulfate sources and shifted from acid mine drainage (AMD) derived from pyrite oxidation to atmospheric sulfates and agricultural fertilizers as well as domestic sewage along the groundwater flow path. In particular, the evolution of sulfate sources was accompanied by changes in the δ13C-DIC values in different seasons. During the dry season, the Rayleigh function described a possibility of enriched δ13C-DIC values in an AMD-affected aquifer, where a dropping water table or decreasing water content in unsaturated zones provided favorable acid buffering conditions. Bicarbonate neutralized protons to CO2 that was in turn spilled over the water surface. During the wet season, the depleted δ13C-DIC values in the AMD-affected aquifer reflected another possibility of the carbon cycle in which a rising water table caused a similar closed system to some extent and slowed down the replenishment of bicarbonate so that δ13C-DIC almost recorded the δ13C of soil CO2. In spite of the same AMD source, their influences on the carbon cycle in the dry and wet seasons were CO2 evasion and deficient CO2 uptake, respectively. By contrast, regardless of the season, the carbon cycle gradually shifted towards a net consumption of CO2 in the aquifer with atmospheric and agricultural sulfates as well as domestic sewage, and δ13C-DIC inherited the characteristic of HCO3 −, indicating that these sources in anthropogenically-induced carbon processes hardly involved in isotopic fractionation of δ13C-DIC. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158640
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510006, China; School of Geography and Planning, Sun Yat-Sen University, Guangzhou, 510000, China; Southern Laboratory of Ocean Science and Engineering, Zhuhai, Guangdong 519000, China; Wuhan Institute of Technology, Wuhan, 430000, China
Recommended Citation:
Wen J.,Tang C.,Cao Y.,et al. Understanding the inorganic carbon transport and carbon dioxide evasion in groundwater with multiple sulfate sources during different seasons using isotope records[J]. Science of the Total Environment,2020-01-01,710