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Spatiotemporal variability of the gas transfer coefficient (KCO2) in boreal streams: Implications for large scale estimates of CO2 evasion
Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umea, Sweden.
Department of Biological Sciences and Department of Geography, University of Cincinnati, Cincinnati, Ohio, USA.
Centre for Ecology and Hydrology, Edinburgh Research Station, Bush Estate, Penicuik, UK.
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2011 (English)In: Global Biogeochemical Cycles, ISSN 0886-6236, E-ISSN 1944-9224, Vol. 25, no 3, GB3025- p.Article in journal (Refereed) Published
Abstract [en]

Boreal streams represent potentially important conduits for the exchange of carbon dioxide (CO(2)) between terrestrial ecosystems and the atmosphere. The gas transfer coefficient of CO(2) (K(CO2)) is a key variable in estimating this source strength, but the scarcity of measured values in lotic systems creates a risk of incorrect flux estimates even when stream gas concentrations are well known. This study used 114 independent measurements of K(CO2) from 14 stream reaches in a boreal headwater system to determine and predict spatiotemporal variability in K(CO2). The K(CO2) values ranged from 0.001 to 0.207 min(-1) across the 14 sites. Median K(CO2) for a specific site was positively correlated with the slope of the stream reach, with higher gas transfer coefficients occurring in steeper stream sections. Combining slope with a width/depth index of the stream reach explained 83% of the spatial variability in K(CO2). Temporal variability was more difficult to predict and was strongly site specific. Variation in K(CO2), rather than pCO(2), was the main determinant of stream CO(2) evasion. Applying published generalized gas transfer velocities produced an error of up to 100% in median instantaneous evasion rates compared to the use of actual measured K(CO2) values from our field study. Using the significant relationship to local slope, the median K(CO2) was predicted for 300,000 km of watercourses (ranging in stream order 1-4) in the forested landscape of boreal/nemoral Sweden. The range in modeled stream order specific median K(CO2) was 0.017-0.028 min(-1) and there was a clear gradient of increasing K(CO2) with lower stream order. We conclude that accurate regional scale estimates of CO(2) evasion fluxes from running waters are possible, but require a good understanding of gas exchange at the water surface.

Place, publisher, year, edition, pages
John Wiley & Sons, 2011. Vol. 25, no 3, GB3025- p.
Keyword [en]
CO2, Gas transfer coefficient, Krycklan, evasion, headwaters, streams
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-160730DOI: 10.1029/2010GB003975ISI: 000295522900001OAI: oai:DiVA.org:uu-160730DiVA: diva2:453090
Available from: 2011-11-01 Created: 2011-10-31 Last updated: 2017-12-08Bibliographically 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 B.Bishop, Kevin H.

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