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Paleoecological evidence of major declines in total organic carbon concentrations since the nineteenth century in four nemoboreal lakes
School of Geography & Geosciences, University of St Andrews.
Department of Environmental Assessment, Swedish University of Agricultural Sciences.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Climate Impacts Research Centre, Umeå University.
2011 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 45, no 4, 507-518 p.Article in journal (Refereed) Published
Abstract [en]

A decade of widespread increases in surface water concentrations of total organic carbon (TOC) in some regions has raised questions about longer term patterns in this important constituent of water chemistry. This study uses near-infrared spectroscopy (NIRS) to infer lake water TOC far beyond the decade or two of observational data generally available. An expanded calibration dataset of 140 lakes across Sweden covering a TOC gradient from 0.7 to 24.7 mg L-1 was used to establish a relationship between the NIRS signal from surface sediments (0-0.5 cm) and the TOC concentration of the water mass. Internal cross-validation of the model resulted in an R (2) of 0.72 with a root mean squared error of calibration (RMSECV) of 2.6 mg L-1. The TOC concentrations reconstructed from surface sediments in four Swedish lakes were typically within the range of concentrations observed in the monitoring data during the period represented by each sediment layer. TOC reconstructions from the full sediment cores of four lakes indicated that TOC concentrations were approximately twice as high a century ago.

Place, publisher, year, edition, pages
2011. Vol. 45, no 4, 507-518 p.
Keyword [en]
Carbon cycling, Dissolved organic carbon Near infrared spectroscopy (NIRS) Paleolimnology Sediment Sweden
National Category
Environmental Sciences Ecology
URN: urn:nbn:se:su:diva-43250DOI: 10.1007/s10933-010-9420-xISI: 000290043900008OAI: diva2:355051
Available from: 2010-10-05 Created: 2010-10-05 Last updated: 2013-07-10Bibliographically approved

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Mettävainio, Ewa
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Department of Physical Geography and Quaternary Geology
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