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Temporal and spatial variability of dissolved inorganic carbon in a boreal stream network: Concentrations and downstream fluxes
Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, SE-75007 Uppsala, Sweden.
Univ Wisconsin, Dept Zool, Madison, WI 53706 USA ; Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden .
Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden .
Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden .
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2010 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 115, G02014- p.Article in journal (Refereed) Published
Abstract [en]

Carbon dioxide (CO2) and dissolved inorganic carbon (DIC) concentrations and export were analyzed throughout a 67 km(2) boreal stream network in northern Sweden. 700 DIC and CO2 samples from 14 subcatchments were collected in 2006 and 2007. All sites were consistently supersaturated in CO2 with respect to the atmosphere. Temporal variability of DIC and CO2 concentration was best correlated with discharge, with concentrations generally diluting at high discharge. However, the variability in CO2 concentration was also dependent on the specific pH range of the stream, as variability was greatest in acidic headwater streams and lowest in larger circumneutral streams. In the larger ones the increase in the CO2 proportion of DIC at increased discharge counteracts the dilution of CO2. The shift toward proportionally more CO2 of the DIC at higher discharge is caused by decline in pH. Spatial patterns showed that DIC and CO2 concentrations were best correlated with peatland coverage of the subcatchment. The highest concentrations were found in headwater streams draining peatlands. The downstream export of DIC from the catchment outlet constitutes 19% of the total downstream export of carbon (DIC + DOC), or 0.7 (+/-0.09) g C m(-2) yr(-1). This study demonstrates the importance of including fluvial fluxes of inorganic carbon in landscape carbon budgets via runoff, and also highlights the need to account for stream evasion of CO2 to the atmosphere in such estimates since it can be larger than the downstream DIC export.

Place, publisher, year, edition, pages
2010. Vol. 115, G02014- p.
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-140490DOI: 10.1029/2009JG001100ISI: 000277479000002OAI: oai:DiVA.org:uu-140490DiVA: diva2:383692
Available from: 2011-01-05 Created: 2011-01-05 Last updated: 2012-12-18Bibliographically approved
In thesis
1. Evasion of CO2 from streams: Quantifying a carbon component of the aquatic conduit in the boreal landscape
Open this publication in new window or tab >>Evasion of CO2 from streams: Quantifying a carbon component of the aquatic conduit in the boreal landscape
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala: Swedish University of Agricultural Sciences, 2011. 44 p.
Series
Acta Universitatis Agriculturae Sueciae, ISSN 1652-6880 ; 2011:5
National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-182945 (URN)978-91-576-7574-3 (ISBN)
Opponent
Funder
Swedish Research Council, 2005-4157
Available from: 2012-10-22 Created: 2012-10-19 Last updated: 2012-10-22Bibliographically approved

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Wallin, Marcus

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