Effects of similar weather patterns on the thermal stratification, mixing regimes and hypolimnetic oxygen depletion in two boreal lakes with different water transparency

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Mammarella , I , Gavrylenko , G , Zdorovennova , G , Ojala , A , Erkkilä , K-M , Zdorovennov , R , Stepanyuk , O , Palshin , N , Terzhevik , A , Vesala , T & Heiskanen , J 2018 , ' Effects of similar weather patterns on the thermal stratification, mixing regimes and hypolimnetic oxygen depletion in two boreal lakes with different water transparency ' , Boreal Environment Research , vol. 23 , pp. 237-247 .

Title: Effects of similar weather patterns on the thermal stratification, mixing regimes and hypolimnetic oxygen depletion in two boreal lakes with different water transparency
Author: Mammarella, Ivan; Gavrylenko, Galina; Zdorovennova, Galina; Ojala, Anne; Erkkilä, Kukka-Maaria; Zdorovennov, Roman; Stepanyuk, Oleg; Palshin, Nikolay; Terzhevik, Arkady; Vesala, Timo; Heiskanen, Jouni
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Department of Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-08
Language: eng
Number of pages: 11
Belongs to series: Boreal Environment Research
ISSN: 1239-6095
URI: http://hdl.handle.net/10138/244917
Abstract: Mechanistic understanding of the impacts of changing climate on the thermal stratification and mixing dynamics of oxygen in lake ecosystems is hindered by limited evidence on how functioning of individual lakes is affected by interannual variability in meteorological conditions. We studied two boreal lakes (Kuivajärvi and Vendyurskoe) with different water clarity during three years representing a gradient of meteorological forcing. The lakes are located in the same climatic region and have a similar depth, but, because of the difference in water transparency, they responded differently to the weather fronts. Long spring overturn and relatively cold summer resulted in weak stratification and well-oxygenated water column in both lakes. However, in dark-water Kuivajärvi, the hypolimnion was unusually warm leading to high production rate of CO2. Warm summer had the most dramatic impact on clear-water lake Vendyurskoe changing its mixing regime from typical polymixis to dimixis, leading to strong oxygen depletion and ensuing anoxia. In dimictic dark-water Kuivajärvi, hot spring resulted in early onset of stratification with ensuing low hypolimnetic temperatures and persistent oxygen depletion. These results indicate that climate warming will increase the risk of occurrence of deep water anoxia.
Subject: 1172 Environmental sciences
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