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Photo-reactivity of dissolved organic carbon in the freshwater continuum
Lund Univ, Sweden.
Univ Montreal, Canada.
Lund Univ, Sweden.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.ORCID iD: 0000-0003-0038-2152
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2019 (English)In: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 81, no 4, article id UNSP 57Article in journal (Refereed) Published
Abstract [en]

The patterns in dissolved organic carbon (DOC) photo-mineralization along the freshwater continuum from land to sea are poorly known. Specifically, it has not been resolved how the photo-degradation ofDOC into CO2 (PD)depends on the combination of intrinsic properties of DOC and extrinsic variables that affect the photo-reactions. We measured PD per unit of absorbed ultraviolet light energy (PD-E-w) in headwater streams, lakes, intermediate rivers and river mouths in Sweden. Surprisingly, no trend of decreasing PD-E-w was found with decreases in colored DOC. However, there was a relationship between PD-E-w and pH, best described by a quadratic (U-shaped) curve, indicating environmental control of photo-reactivity. Interestingly, the highest values for both of these variables were recorded for river mouths. Moreover, PD-E-w increased with proxy variables for the amount of autochthonous DOC in the water. Thus, changes in pH and autochthonous DOC input along the continuum may sustain high DOC photo-mineralization throughout continental aquatic networks.

Place, publisher, year, edition, pages
SPRINGER BASEL AG , 2019. Vol. 81, no 4, article id UNSP 57
Keywords [en]
Photo-reactivity; Dissolved organic carbon; Freshwater systems; Colored dissolved organic matter; pH
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:liu:diva-159229DOI: 10.1007/s00027-019-0653-0ISI: 000476490500002OAI: oai:DiVA.org:liu-159229DiVA, id: diva2:1341865
Note

Funding Agencies|Lund University; Helge Ax:son Johnsons Stiftelse [130622]; Kungliga Fysiografiska Sallskapet i Lund [32953]; FORMAS [239-2014-698, 210-2012-1461]; Swedish Research Council VR [2012-00048]

Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-11-15

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