DOI: 10.1002/gbc.20024
Scopus记录号: 2-s2.0-84881085206
论文题名: Spatiotemporal variations of pCO2 and δ13C-DIC in subarctic streams in northern Sweden
作者: Giesler R ; , Mörth C ; -M ; , Karlsson J ; , Lundin E ; J ; , Lyon S ; W ; , Humborg C
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 1 起始页码: 176
结束页码: 186
语种: 英语
英文关键词: δ13C-DIC
; high-latitude
; stream
; tundra
Scopus关键词: Average concentration
; Dissolved inorganic carbon
; high-latitude
; Partial pressure of co
; Spatio-temporal variation
; Stable isotopic compositions
; stream
; tundra
; Aerodynamics
; Carbon dioxide
; Rivers
; baseflow
; biogeochemistry
; boreal forest
; carbon dioxide
; carbon isotope
; climate change
; degassing
; dissolved inorganic carbon
; partial pressure
; soil respiration
; spatiotemporal analysis
; streamwater
; subarctic region
; tundra
; vegetation cover
; watershed
; Sweden
英文摘要: Current predictions of climate-related changes in high-latitude environments suggest major effects on the C export in streams and rivers. To what extent this will also affect the stream water CO2 concentrations is poorly understood. In this study we examined the spatiotemporal variation in partial pressure of CO2 (pCO2) and in stable isotopic composition of dissolved inorganic carbon (δ13C-DIC) in subarctic streams in northern Sweden. The selected watersheds are characterized by large variations in high-latitude boreal forest and tundra and differences in bedrock. We found that all streams generally were supersaturated in pCO 2 with an average concentration of 850 μatm. The variability in pCO2 across streams was poorly related to vegetation cover, and carbonaceous bedrock influence was manifested in high DIC concentrations but not reflected in either stream pCO2 or δ13C-DIC. Stream water pCO2 values were highest during winter base flow when we also observed the lowest δ13C-DIC values, and this pattern is interpreted as a high contribution from CO2 from soil respiration. Summer base flow δ13C-DIC values probably are more affected by in situ stream processes such as aquatic production/respiration and degassing. A challenge for further studies will be to disentangle the origin of stream water CO2 and quantify their relative importance. ©2013. 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/77601
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Ecology and Environmental Science, Climate Impacts Research Centre, Umeå University, Vetenskapens vag 38, Abisko 98107, Sweden; Geology and Geochemistry, Stockholm University, Stockholm, Sweden; Bert Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden; Applied Environmental Science, Stockholm University, Stockholm, Sweden
Recommended Citation:
Giesler R,, Mörth C,-M,et al. Spatiotemporal variations of pCO2 and δ13C-DIC in subarctic streams in northern Sweden[J]. Global Biogeochemical Cycles,2013-01-01,27(1)