Journal
JOURNAL OF SEA RESEARCH
Volume 49, Issue 4, Pages 357-366Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1385-1101(03)00019-4
Keywords
water quality; optical properties; fresh and brackish water
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A preliminary optical classification of lakes in Estonia and south Finland which can also be used for small bays of the Baltic Sea is elaborated. The classification is based on the optical properties of water (diffuse attenuation coefficient, diffuse reflectance) and parameters that are routinely monitored in water bodies (Secchi depth, concentration of chlorophyll-a, total suspended matter and yellow substance). The data complex used for our classification covers different types of water ecosystems (ranging from oligotrophic to hypertrophic) and the variability of water constituent concentrations in the ice-free period in Estonia and south Finland. Using cluster analysis, we found 5 optical classes of waters: clear (C), moderate (M), turbid (T), very turbid (V) and brown (B). There is satisfactory correspondence between clash of water, shape of diffuse attenuation coefficient and diffuse reflectance spectra and trophic state of the lakes. (C) 2603 Elsevier Science B.V. All rights reserved.
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