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  • 1.
    Bergström, Ann-Kristin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Creed, Irena F.
    Department of Physical and Environmental Sciences, University of Toronto, ON, Toronto, Canada.
    Palstev, Aleksey
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    de Wit, Heleen A.
    Centre of Biogeochemistry in the Anthropocene and Department of Bioscience, University of Oslo, Oslo, Norway; Norwegian Institute for Water Research, Oslo, Norway.
    Lau, Danny C. P.
    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Drakare, Stina
    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Vrede, Tobias
    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Isles, Peter D. F.
    Watershed Management Division, Vermont Department of Environmental Conservation, VT, Montpelier, United States.
    Jonsson, Anders
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Geibrink, Erik
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Kortelainen, Pirkko
    Finnish Environment Institute (SYKE), Helsinki, Finland.
    Vuorenmaa, Jussi
    Finnish Environment Institute (SYKE), Helsinki, Finland.
    Vuorio, Kristiina
    Finnish Environment Institute (SYKE), Helsinki, Finland.
    Kahilainen, Kimmo K.
    Lammi Biological Station, University of Helsinki, Helsinki, Finland.
    Hessen, Dag Olav
    Centre of Biogeochemistry in the Anthropocene and Department of Bioscience, University of Oslo, Oslo, Norway.
    Declining calcium concentration drives shifts toward smaller and less nutritious zooplankton in northern lakes2024In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 30, no 3, article id e17220Article in journal (Refereed)
    Abstract [en]

    Zooplankton community composition of northern lakes is changing due to the interactive effects of climate change and recovery from acidification, yet limited data are available to assess these changes combined. Here, we built a database using archives of temperature, water chemistry and zooplankton data from 60 Scandinavian lakes that represent broad spatial and temporal gradients in key parameters: temperature, calcium (Ca), total phosphorus (TP), total organic carbon (TOC), and pH. Using machine learning techniques, we found that Ca was the most important determinant of the relative abundance of all zooplankton groups studied, while pH was second, and TOC third in importance. Further, we found that Ca is declining in almost all lakes, and we detected a critical Ca threshold in lake water of 1.3 mg L−1, below which the relative abundance of zooplankton shifts toward dominance of Holopedium gibberum and small cladocerans at the expense of Daphnia and copepods. Our findings suggest that low Ca concentrations may shape zooplankton communities, and that current trajectories of Ca decline could promote widespread changes in pelagic food webs as zooplankton are important trophic links from phytoplankton to fish and different zooplankton species play different roles in this context.

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  • 2.
    Mohammadi, Younes
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Palstev, Aleksey
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Polajžer, Boštjan
    Faculty of Electrical Engineering and Computer Science, University of Maribor, Maribor, Slovenia.
    Miraftabzadeh, Seyed Mahdi
    Department of Energy, Politecnico di Milano, Via Lambruschini 4, Milano, Italy.
    Khodadad, Davood
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Investigating Winter Temperatures in Sweden and Norway: Potential Relationships with Climatic Indices and Effects on Electrical Power and Energy Systems2023In: Energies, E-ISSN 1996-1073, Vol. 16, no 14, article id 5575Article in journal (Refereed)
    Abstract [en]

    This paper presents a comprehensive study of winter temperatures in Norway and northern Sweden, covering a period of 50 to 70 years. The analysis utilizes Singular Spectrum Analysis (SSA) to investigate temperature trends at six selected locations. The results demonstrate an overall long-term rise in temperatures, which can be attributed to global warming. However, when investigating variations in highest, lowest, and average temperatures for December, January, and February, 50% of the cases exhibit a significant decrease in recent years, indicating colder winters, especially in December. The study also explores the variations in Atlantic Meridional Overturning Circulation (AMOC) variations as a crucial climate factor over the last 15 years, estimating a possible 20% decrease/slowdown within the first half of the 21st century. Subsequently, the study investigates potential similarities between winter AMOC and winter temperatures in the mid to high latitudes over the chosen locations. Additionally, the study examines another important climatic index, the North Atlantic Oscillation (NAO), and explores possible similarities between the winter NAO index and winter temperatures. The findings reveal a moderate observed lagged correlation for AMOC-smoothed temperatures, particularly in December, along the coastal areas of Norway. Conversely, a stronger lagged correlation is observed between the winter NAO index and temperatures in northwest Sweden and coastal areas of Norway. Thus, NAO may influence both AMOC and winter temperatures (NAO drives both AMOC and temperatures). Furthermore, the paper investigates the impact of colder winters, whether caused by AMOC, NAO, or other factors like winds or sea ice changes, on electrical power and energy systems, highlighting potential challenges such as reduced electricity generation, increased electricity consumption, and the vulnerability of power grids to winter storms. The study concludes by emphasizing the importance of enhancing the knowledge of electrical engineering researchers regarding important climate indices, AMOC and NAO, the possible associations between them and winter temperatures, and addressing the challenges posed by the likelihood of colder winters in power systems.

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