The Effects of Extremely Hot Summer 2010 on Water Temperature and Oxygen Distributionin Karelian Lakes

T. V. Efremova, N. I. Pal’shin, G. E. Zdorovennova, and A. Yu. Terzhevik

Presented are the results of the analysis of interannual variability of the thermal regime of two Karelian lakes. The data of long-term observations in Lake Syamozero (1953–2011) and Lake Vendyurskoe (2007–2013) enabled analyzing and comparing the range of the natural interannual variability of water temperature and its values in hot summer 2010. Considered are the effects of extreme conditions in summer 2010 on the formation of thermal stratification and on the dissolved oxygen regime in the lakes. It is revealed that the global warming may increase the probability of deep anoxia development in shallow lakes in the temperate zone.