DOI: 10.1002/2016GB005578
Scopus记录号: 2-s2.0-85017425538
论文题名: Carbonate buffering and metabolic controls on carbon dioxide in rivers
作者: Stets E ; G ; , Butman D ; , McDonald C ; P ; , Stackpoole S ; M ; , DeGrandpre M ; D ; , Striegl R ; G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 4 起始页码: 663
结束页码: 677
语种: 英语
英文关键词: biogeochemistry
; carbon
; metabolism
; rivers
; streams
Scopus关键词: air-water interaction
; alkalinity
; biogeochemistry
; buffering
; carbon cycle
; carbon dioxide
; carbon flux
; carbonate
; concentration (composition)
; environmental monitoring
; metabolism
; oxygen consumption
; river water
; saturation
; stream
; water quality
英文摘要: Multiple processes support the significant efflux of carbon dioxide (CO2) from rivers and streams. Attribution of CO2 oversaturation will lead to better quantification of the freshwater carbon cycle and provide insights into the net cycling of nutrients and pollutants. CO2 production is closely related to O2 consumption because of the metabolic linkage of these gases. However, this relationship can be weakened due to dissolved inorganic carbon inputs from groundwater, carbonate buffering, calcification, and anaerobic metabolism. CO2 and O2 concentrations and other water quality parameters were analyzed in two data sets: a synoptic field study and nationwide water quality monitoring data. CO2 and O2 concentrations were strongly negatively correlated in both data sets (ρ = −0.67 and ρ = −0.63, respectively), although the correlations were weaker in high-alkalinity environments. In nearly all samples, the molar oversaturation of CO2 was a larger magnitude than molar O2 undersaturation. We used a dynamically coupled O2CO2 model to show that lags in CO2 air-water equilibration are a likely cause of this phenomenon. Lags in CO2 equilibration also impart landscape-scale differences in the behavior of CO2 between high- and low-alkalinity watersheds. Although the concept of carbonate buffering and how it creates lags in CO2 equilibration with the atmosphere is well understood, it has not been sufficiently integrated into our understanding of CO2 dynamics in freshwaters. We argue that the consideration of carbonate equilibria and its effects on CO2 dynamics are primary steps in understanding the sources and magnitude of CO2 oversaturation in rivers and streams. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77752
Appears in Collections: 气候变化事实与影响
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作者单位: U.S. Geological Survey National Research Program, Boulder, CO, United States; School of Environmental and Forest Sciences, University of Washington, Seattle, WA, United States; Superior Hydroscience, Marquette, MI, United States; U.S. Geological Survey National Research Program, Denver, CO, United States; Department of Chemistry and Biochemistry, University of Montana, Missoula, MT, United States
Recommended Citation:
Stets E,G,, Butman D,et al. Carbonate buffering and metabolic controls on carbon dioxide in rivers[J]. Global Biogeochemical Cycles,2017-01-01,31(4)