SS3.04 Biogeochemistry of DOC/DON in a Watershed Context
Date: Wednesday, June 12, 2002
Time: 9:30:00 AM
Location: Carson B
 
ArvolaLM, Univ. of Helsinki/Lammi Biological Station, , Finland, lauri.arvola@helsinki.fi
Huitu, E, , Univ. of Helsinki/Lammi Biological Station, , Finland, eeva.huitu@helsinki.fi
Mäkelä, S, M, Univ. of Helsinki/Lammi Biological Station, , Finland, suvi.m.makela@helsinki.fi
Hakala, I, , Univ. of Helsinki/Lammi Biological Station, , Finland, ilpo.hakala@helsinki.fi
 
THE EXPORT OF TOC AND NUTRIENTS FROM SMALL BOREAL CATCHMENTS IN SOUTHERN FINLAND
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Water chemistry data on three small boreal rivers in southern Finland were analysed and fluxes of TOC and nutrients were estimated for the last 7 years. The data sets are based on continuous runoff measurements and daily-weekly chemical sampling started in autumn 1994 and continued till the end of 2001. The results showed that hydrological conditions explain a high proportion of the annual and seasonal variability of water quality in these three rivers, and particularly the export of TOC and nutrients from the catchments. Although spring is the time of maximum runoff and high transportation of TOC and nutrients by the rivers in the north, warmer weather conditions in late autumn and early winter may drastically increase TOC and nutrient loads from the catchments into the rivers and lakes.