Spatiotemporal variations of pCO2 and δ13C-DIC in subarctic streams in northern Sweden
Article first published online: 28 FEB 2013
©2013. American Geophysical Union. All Rights Reserved.
Global Biogeochemical Cycles
Volume 27, Issue 1, pages 176–186, March 2013
How to Cite
2013), Spatiotemporal variations of pCO2 and δ13C-DIC in subarctic streams in northern Sweden, Global Biogeochem. Cycles, 27, 176–186, doi:10.1002/gbc.20024., , , , , and (
- Issue published online: 15 APR 2013
- Article first published online: 28 FEB 2013
- Accepted manuscript online: 17 JAN 2013 12:00AM EST
- Manuscript Accepted: 6 JAN 2013
- Manuscript Revised: 26 DEC 2012
- Manuscript Received: 24 MAY 2012
 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 pCO2 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.