Photo-reactivity of dissolved organic carbon in the freshwater continuum. Panneer Selvam, B., Lapierre, J., Soares, A. R. A., Bastviken, D., Karlsson, J., & Berggren, M. Aquatic Sciences, 81(4):57, July, 2019.
Photo-reactivity of dissolved organic carbon in the freshwater continuum [link]Paper  doi  abstract   bibtex   
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.
@article{panneer_selvam_photo-reactivity_2019,
	title = {Photo-reactivity of dissolved organic carbon in the freshwater continuum},
	volume = {81},
	issn = {1420-9055},
	url = {https://doi.org/10.1007/s00027-019-0653-0},
	doi = {10.1007/s00027-019-0653-0},
	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.},
	language = {en},
	number = {4},
	urldate = {2019-07-30},
	journal = {Aquatic Sciences},
	author = {Panneer Selvam, Balathandayuthabani and Lapierre, Jean-François and Soares, Ana R. A. and Bastviken, David and Karlsson, Jan and Berggren, Martin},
	month = jul,
	year = {2019},
	keywords = {\#nosource, Colored dissolved organic matter, Dissolved organic carbon, Freshwater systems, Photo-reactivity, pH},
	pages = {57},
}

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