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Photo-reactivity of dissolved organic carbon in the freshwater continuum
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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
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:umu:diva-161976DOI: 10.1007/s00027-019-0653-0ISI: 000476490500002OAI: oai:DiVA.org:umu-161976DiVA, id: diva2:1342728
Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-14Bibliographically approved

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Karlsson, Jan

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
More styles
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  • de-DE
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  • nn-NO
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  • Other locale
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Output format
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  • asciidoc
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