Paleoecological evidence of major declines in total organic carbon concentrations since the nineteenth century in four nemoboreal lakes

Sammanfattning

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.

Nyckelord

Carbon cycling; Dissolved organic carbon; Near infrared spectroscopy (NIRS); Paleolimnology; Sediment; Sweden

Publicerad i

Journal of Paleolimnology
2011, Volym: 45, nummer: 4, sidor: 507-518

SLU författare

• Bishop, Kevin

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

Associerade SLU-program

Sjöar och vattendrag
Klimat
Försurning


UKÄ forskningsämne

Fisk- och akvakulturforskning
Miljö- och naturvårdsvetenskap


Publikationens identifierare

DOI: https://doi.org/10.1007/s10933-010-9420-x

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/37600