Bishop, Kevin
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
Abstract
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.
Keywords
Carbon cycling; Dissolved organic carbon; Near infrared spectroscopy (NIRS); Paleolimnology; Sediment; Sweden
Published in
Journal of Paleolimnology
2011, volume: 45, number: 4, pages: 507-518
SLU Authors
Associated SLU-program
Lakes and watercourses
Climate
Acidification
UKÄ Subject classification
Fish and Aquacultural Science
Environmental Sciences and Nature Conservation
Publication identifier
- DOI: https://doi.org/10.1007/s10933-010-9420-x
Permanent link to this page (URI)
https://res.slu.se/id/publ/37600