Diatom-inferred increase in limnetic phosphorus concentration and the associated changes in sedimentary phosphorus fractions in Valkjärvi, a lake in Kärkölä, Finland

A diatom-based total phosphorus (TP) model developed for southern Finland is used to infer past epilimnetic TP concentrations in Valkjärvi, a lake located in Kärkölä, Finland; and the results are compared with sedimentary phosphorus fractions. The diatom-based models accurately predicted epilimnetic...

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Published in:Boreal environment research 2002, Vol.7 (1), p.27-40
Main Authors: KAUPPILA, Tommi, MOISIO, Teppo, SALONEN, Veli-Pekka
Format: Article
Language:English
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Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Geochemistry
Marine and continental quaternary
Pollution, environment geology
Soil and rock geochemistry
Surficial geology
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description A diatom-based total phosphorus (TP) model developed for southern Finland is used to infer past epilimnetic TP concentrations in Valkjärvi, a lake located in Kärkölä, Finland; and the results are compared with sedimentary phosphorus fractions. The diatom-based models accurately predicted epilimnetic TP concentrations as indicated by monitoring data available since 1979. Altogether, concentrations have increased from 15 ug P l–1 in the 1940s to the present level of ~65 ug P l–1. After an initial slow increase, the lake became eutrophicated rapidly in the 1960s as a result of municipal wastewater from the Kärkölä commune. These nutrient inputs resulted in increased sedimentary phosphorus concentrations. The NaOH-extracted phosphorus fraction in particular increased in the profundal sediments. The changes in sedimentary phosphorus nevertheless occurred later than the increase in diatom-inferred limnetic TP concentration.
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subjects Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Geochemistry
Marine and continental quaternary
Pollution, environment geology
Soil and rock geochemistry
Surficial geology
title Diatom-inferred increase in limnetic phosphorus concentration and the associated changes in sedimentary phosphorus fractions in Valkjärvi, a lake in Kärkölä, Finland
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