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Variability in organic carbon reactivity across lake residence time and trophic gradients

Nature geoscience, 2017-11, Vol.10 (11), p.832-835 [Peer Reviewed Journal]

Copyright Nature Publishing Group Nov 2017 ;ISSN: 1752-0894 ;ISSN: 1752-0908 ;EISSN: 1752-0908 ;DOI: 10.1038/ngeo3051

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Title:
Variability in organic carbon reactivity across lake residence time and trophic gradients
Author: Evans, Chris D. ; Futter, Martyn N. ; Moldan, Filip ; Valinia, Salar ; Frogbrook, Zoe ; Kothawala, Dolly N.
Subjects: Biological activity ; Carbon ; Carbon budget ; Carbon cycle ; Carbon dioxide ; Carbon dioxide emissions ; Carbon sources ; Dissolved organic carbon ; Eutrophication ; Gradients ; Inland waters ; Lakes ; Mineral nutrients ; Nutrient concentrations ; Oceanografi, hydrologi, vattenresurser ; Oceanography, Hydrology, Water Resources ; Oceans ; Organic carbon ; Organic matter ; Photochemicals ; Photochemistry ; Reactivity ; Removal ; Residence time ; Sinkholes ; Trophic levels ; Trophic status ; Trophic structure ; Water ; Water treatment
Is Part Of: Nature geoscience, 2017-11, Vol.10 (11), p.832-835
Description: The transport of dissolved organic carbon from land to ocean is a large dynamic component of the global carbon cycle. Inland waters are hotspots for organic matter turnover, via both biological and photochemical processes, and mediate carbon transfer between land, oceans and atmosphere. However, predicting dissolved organic carbon reactivity remains problematic. Here we present in situ dissolved organic carbon budget data from 82 predominantly European and North American water bodies with varying nutrient concentrations and water residence times ranging from one week to 700 years. We find that trophic status strongly regulates whether water bodies act as net dissolved organic carbon sources or sinks, and that rates of both dissolved organic carbon production and consumption can be predicted from water residence time. Our results suggest a dominant role of rapid light-driven removal in water bodies with a short water residence time, whereas in water bodies with longer residence times, slower biotic production and consumption processes are dominant and counterbalance one another. Eutrophication caused lakes to transition from sinks to sources of dissolved organic carbon. We conclude that rates and locations of dissolved organic carbon processing and associated CO2 emissions in inland waters may be misrepresented in global carbon budgets if temporal and spatial reactivity gradients are not accounted for.
Publisher: London: Nature Publishing Group
Language: English
Identifier: ISSN: 1752-0894
ISSN: 1752-0908
EISSN: 1752-0908
DOI: 10.1038/ngeo3051
Source: ProQuest Central

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Variability in organic carbon reactivity across lake residence time and trophic gradients

Copyright Nature Publishing Group Nov 2017 ;ISSN: 1752-0894 ;ISSN: 1752-0908 ;EISSN: 1752-0908 ;DOI: 10.1038/ngeo3051

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