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Photo-reactivity of dissolved organic carbon in the freshwater continuum
Lund Univ, Sweden.
Univ Montreal, Canada.
Lund Univ, Sweden.
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.ORCID-id: 0000-0003-0038-2152
Vise andre og tillknytning
2019 (engelsk)Inngår i: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 81, nr 4, artikkel-id UNSP 57Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
SPRINGER BASEL AG , 2019. Vol. 81, nr 4, artikkel-id UNSP 57
Emneord [en]
Photo-reactivity; Dissolved organic carbon; Freshwater systems; Colored dissolved organic matter; pH
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-159229DOI: 10.1007/s00027-019-0653-0ISI: 000476490500002OAI: oai:DiVA.org:liu-159229DiVA, id: diva2:1341865
Merknad

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]

Tilgjengelig fra: 2019-08-12 Laget: 2019-08-12 Sist oppdatert: 2019-11-15

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