Temporal evolution of organic carbon concentrations in Swiss lakes: Trends of allochthonous and autochthonous organic carbon

Evaluation of time series of organic carbon (OC) concentrations in lakes is useful for monitoring some of the effects of global change on lakes and their catchments. Isolating the evolution of autochthonous and allochthonous lake OC might be a useful way to differentiate between drivers of soil and...

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Bibliographic Details
Published in:The Science of the total environment 2015-07, Vol.520, p.13-22
Main Authors: Rodríguez-Murillo, J.C., Filella, M.
Format: Article
Language:English
Subjects:
Carbon
Carbon - analysis
Carbon cycle
Catchments
Construction
DOC
Environmental Monitoring
Eutrophication
Evolution
Lakes
Lakes - chemistry
OC origin
Organic carbon
Statistical methods
Switzerland
Temporal logic
Temporal trends
Time series
Trends
Water Pollutants, Chemical - analysis
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Summary:Evaluation of time series of organic carbon (OC) concentrations in lakes is useful for monitoring some of the effects of global change on lakes and their catchments. Isolating the evolution of autochthonous and allochthonous lake OC might be a useful way to differentiate between drivers of soil and photosynthetic OC related changes. However, there are no temporal series for autochthonous and allochthonous lake OC. In this study, a new approach has been developed to construct time series of these two categories of OC from existing dissolved organic carbon (DOC) data. First, temporal series (longer than ten years) of OC have been compiled for seven big Swiss lakes and another 27 smaller ones and evaluated by using appropriate non-parametric statistical methods. Subsequently, the new approach has been applied to construct time series of autochthonous and allochthonous lake OC in the seven big lakes. Doing this was possible because long term series of DOC concentrations at different depths are available for these lakes. Organic carbon concentrations generally increase in big lakes and decrease in smaller ones, although only in some cases are these trends statistically significant. The magnitude of the observed changes is generally small in big lakes (
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2015.02.085