Photo-reactivity of dissolved organic carbon in the freshwater continuum
(2019) In Aquatic Sciences 81(4).- Abstract
- 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 of DOC 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-Ew) in headwater streams, lakes, intermediate rivers and river mouths in Sweden. Surprisingly, no trend of decreasing PD-Ew was found with decreases in colored DOC. However, there was a relationship between PD-Ew and pH, best described by a quadratic (U-shaped) curve, indicating environmental control of photo-reactivity. Interestingly, the highest... (More)
- 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 of DOC 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-Ew) in headwater streams, lakes, intermediate rivers and river mouths in Sweden. Surprisingly, no trend of decreasing PD-Ew was found with decreases in colored DOC. However, there was a relationship between PD-Ew 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-Ew 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7e925d28-0356-4094-a695-b77366d0ec2b
- author
- Panneer Selvam, Balathandayuthabani LU ; Lapierre, Jean-François ; Soares, Ana LU ; Bastviken, David ; Karlsson, Jan and Berggren, Martin LU
- organization
- publishing date
- 2019-10
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Photo-reactivity, Dissolved organic carbon, Freshwater systems, Colored dissolved organic matter, pH
- in
- Aquatic Sciences
- volume
- 81
- issue
- 4
- article number
- 57
- publisher
- Springer
- external identifiers
-
- scopus:85069150114
- ISSN
- 1420-9055
- DOI
- 10.1007/s00027-019-0653-0
- project
- Terrestrial export of labile dissolved organic carbon in a changing environment
- language
- English
- LU publication?
- yes
- id
- 7e925d28-0356-4094-a695-b77366d0ec2b
- date added to LUP
- 2019-07-22 10:14:11
- date last changed
- 2022-04-26 03:10:19
@article{7e925d28-0356-4094-a695-b77366d0ec2b, abstract = {{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 of DOC 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-Ew) in headwater streams, lakes, intermediate rivers and river mouths in Sweden. Surprisingly, no trend of decreasing PD-Ew was found with decreases in colored DOC. However, there was a relationship between PD-Ew 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-Ew 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.}}, author = {{Panneer Selvam, Balathandayuthabani and Lapierre, Jean-François and Soares, Ana and Bastviken, David and Karlsson, Jan and Berggren, Martin}}, issn = {{1420-9055}}, keywords = {{Photo-reactivity; Dissolved organic carbon; Freshwater systems; Colored dissolved organic matter; pH}}, language = {{eng}}, number = {{4}}, publisher = {{Springer}}, series = {{Aquatic Sciences}}, title = {{Photo-reactivity of dissolved organic carbon in the freshwater continuum}}, url = {{https://lup.lub.lu.se/search/files/77107071/PanneerSelvam2019_Article_Photo_reactivityOfDissolvedOrg_correction.pdf}}, doi = {{10.1007/s00027-019-0653-0}}, volume = {{81}}, year = {{2019}}, }