PARTICULAR EXAMPLE OF MEROMIXIS IN THE ANTHROPOGENIC RESERVOIR, Carpathian Journal of Earth and Environmental Sciences, February 2018, Vol. 13, No. 1, p. 5 – 13; DOI:10.26471/cjees/2018/013/001 - Carpathian Journal of Earth And Environmental Sciences

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Jacek KUBIAK¹, Sylwia MACHULA¹ & Adam CHOIŃSKI²

¹West Pomeranian University of Technology in Szczecin Department of Hydrochemistry and Aquatic Biological Resources Kazimierza Królewicza 4, 71-550 Szczecin, Poland, e-mail: jacek.kubiak@zut.edu.pl; sylwia.machula@zut.edu.pl, phone: +48 91 449 66 95; +48 91 449 66 98

² Institute of Physical Geography and Environmental Planning, Adam Mickiewicz University

Dzięgielowa 27, 61-680 Poznań, -mail: choinski@amu.edu.pl, phone: +48 (0)61 829 6260

PARTICULAR EXAMPLE OF MEROMIXIS IN THE ANTHROPOGENIC RESERVOIR, Carpathian Journal of Earth and Environmental Sciences, February 2018, Vol. 13, No. 1, p. 5 – 13; DOI:10.26471/cjees/2018/013/001

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The thermal regime of the Czarnogłowy, a post-mining lake studied in 2008-2010, showed the reservoir to be meromictic. Throughout the year, the water column of the lake was divided into two layers (the mixolimnion extending down to 20 m depth and the monimolimnion) separated by a distinct, thin (about 2.0 m thick) chemocline. The chemical composition of the mixolimnion water was highly variable, the highest concentrations being shown by Ca, Na, Cl, SO₄, and HCO₃ ions. The same ions were also dominant in the monimolimnion, but their concentrations there were much higher and much less variable. The Czarnogłowy meromixis was found to be crenogenic. The lake received an inflow of groundwater from springs in the reservoir and the elevated mineralisation may have resulted from the inflow of groundwater seeping through the sedimentary limestone in the catchment. However, due to the limited data, these findings need further investigation.