CDOM variations in Finnish lakes and rivers between 1913 and 2014

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http://hdl.handle.net/10138/302634

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Arvola , L , Leppäranta , M & Äijälä , C 2017 , ' CDOM variations in Finnish lakes and rivers between 1913 and 2014 ' , The Science of the Total Environment , vol. 601-602 , pp. 1638-1648 . https://doi.org/10.1016/j.scitotenv.2017.06.034

Title: CDOM variations in Finnish lakes and rivers between 1913 and 2014
Author: Arvola, Lauri; Leppäranta, Matti; Äijälä, Cecilia
Contributor: University of Helsinki, Lammi Biological Station
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017
Language: eng
Number of pages: 11
Belongs to series: The Science of the Total Environment
ISSN: 0048-9697
URI: http://hdl.handle.net/10138/302634
Abstract: In lakes and rivers, the concentrations of dissolved organic carbon (DOC) and coloured dissolved organic matter (CDOM) are closely related. We analysed three large spectrophotometer data sets of Finnish inland waters from the years 1913–1914, 1913–1931 and 2014 for long-term changes in optical properties. The first data set consists of absorption spectra in the band 467–709 nm of 212 filtered water samples, the second one contains 11– 19 years of data for seven rivers, and the third one contains 153 sites with high resolution spectra over the band 200–750 nm. These data sets were supplemented with more recent monitoring data of DOC. The sites represent typical optical inland water types of north-eastern Europe. The results did not show any consistent large-scale changes in CDOM concentrations over the 101-year time period. The statistics of the absorption coefficients in 1913 and 2014 were almost identical, at 467 nm they were 1.9 ± 1.0 m−1 in 1913 and 1.7 ± 1.2 m−1 in 2014, and the shape of the CDOM absorption spectrum was unchanged, proportional to exp(–S·λ), S = 0.011 nm−1 and λ is wavelength. Catchment properties, primarily lake and peat-land percentages, explained 50% of the variation of CDOM concentration in the lakes, and hydrological conditions explained 50% of the variation of CDOM in the rivers. Both illustrate the importance of catchments and hydrology to CDOM concentrations of boreal inland waters.
Subject: 116 Chemical sciences
DISSOLVED ORGANIC-CARBON
HIGHLY HUMIC LAKE
IRON CONCENTRATIONS
OPTICAL-PROPERTIES
SURFACE WATERS
BOREAL LAKE
FINLAND
BACTERIA
EXPORT
1172 Environmental sciences
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