Institute of Water Problems of the North Karelian Research Centre

About: Institute of Water Problems of the North Karelian Research Centre is a facility organization based out in . It is known for research contribution in the topics: Geology & Chemistry. The organization has 4 authors who have published 9 publications receiving 23 citations. The organization is also known as: Federal State Institution of Science Institute of Water Problems of the North Karelian Research Centre of the Russian Academy of Sciences.

A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector

Abstract: Abstract. Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure and resulting changes in lake biogeochemistry in order to plan for the likely impacts. Previous studies of the impacts of climate change on lakes have often relied on a single model forced with limited scenario-driven projections of future climate for a relatively small number of lakes. As a result, our understanding of the effects of climate change on lakes is fragmentary, based on scattered studies using different data sources and modelling protocols, and mainly focused on individual lakes or lake regions. This has precluded identification of the main impacts of climate change on lakes at global and regional scales and has likely contributed to the lack of lake water quality considerations in policy-relevant documents, such as the Assessment Reports of the Intergovernmental Panel on Climate Change (IPCC). Here, we describe a simulation protocol developed by the Lake Sector of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) for simulating climate change impacts on lakes using an ensemble of lake models and climate change scenarios for ISIMIP phases 2 and 3. The protocol prescribes lake simulations driven by climate forcing from gridded observations and different Earth system models under various representative greenhouse gas concentration pathways (RCPs), all consistently bias-corrected on a 0.5∘ × 0.5∘ global grid. In ISIMIP phase 2, 11 lake models were forced with these data to project the thermal structure of 62 well-studied lakes where data were available for calibration under historical conditions, and using uncalibrated models for 17 500 lakes defined for all global grid cells containing lakes. In ISIMIP phase 3, this approach was expanded to consider more lakes, more models, and more processes. The ISIMIP Lake Sector is the largest international effort to project future water temperature, thermal structure, and ice phenology of lakes at local and global scales and paves the way for future simulations of the impacts of climate change on water quality and biogeochemistry in lakes.

Geochemical features of river flow into Lake Onego

Abstract: <p>Lake Onego is the second largest body of water in Europe (S lake mirrors = 9720 km<sup>2</sup>, V = 295 km<sup>3</sup>, S catchment area = 53100 km<sup>2</sup>), located at the junction of two geological structures (the Fennoscandian Shield and the Russian Platform) is characterized by a complex morphology of the basin, uneven distribution of river flow and anthropogenic load.</p><p>In 2020-2021, the peculiarities of the flow of terrigenous material into the lake, affecting the formation of heterogeneity in the composition of the mineral part of the bottom sediments, were studied. New knowledge was obtained about the seasonal variability of the geochemical composition of river waters, the spatial and temporal nature of its variability was shown. By the example of iron, manganese and total phosphorus, the seasonal distribution of the forms of migration of these elements in rivers is considered. Concentrations of dissolved and suspended forms of trace elements in river waters were obtained. The uneven distribution of river suspension particles by size and degree of rolling, as well as seasonal differences in the ratio of mineral and organic components of the suspension are shown. The study of the composition of the dispersed sedimentary matter revealed similar spectra of minerals. It was found that the material of river suspensions is represented by a biogenic X-ray amorphous mass (biodetrite of diatoms, spores and pollen of plant communities) with associations of detrital mineral particles, scaly formations of layered silicates and aluminosilicates, fouling with jelly-like clots and films of oxides and hydroxides of manganese and iron on organic skeletons.</p><p>The study was supported by RFBR grant #19-05-50014, RSF research project #18-17-00176 and by the Federal Budget, within the State Assignments nos. 121021700116-6.</p>

Structural and functional characteristics of phytoplankton of Lake Vendyurskoe affected by trout farm

Abstract: The paper presents the results of a study of the phytoplankton of small Lake Vendyurskoe (south of Karelia) in the spring ice period, in summer and autumn seasons of 2020. The dynamics of quantitative and structural indices of lake algae during the trout farm operation is considered in comparison with the indices of previous years. For the studied seasons of 2020 there were identified 122 taxa of algal flora belonging to 8 divisions. The structure of algocenoses can be characterized by rich species diversity and quantitative development as diatom green structure with golden algae insertions. In autumn the representatives of cyanobacteria were encountered en masse in some areas. Phytoplankton abundance in the spring ice period varied within 612 thousand cells/l - 2188 thousand cells/l, the biomass reached 2.9 mg/l with a minimum value of 0.1 mg/l. Phytoplankton abundance for the studied summer period of 2020 averaged 2216±796 thousand cells/l with a maximum value of 3986 thousand cells/l, the average biomass in the lake did not ex-ceed 1.325±0.504 mg/l. Phytoplankton abundance in autumn averaged 4934±1665 thousand cells/l with a maximum value of 7832 thousand cells/l; biomass averaged 5.8±1.5 mg/l with a maximum value of 7.9 mg/l. According to the eco-logical and geographical characteristics, most representatives of the algal flora found in the lake are widespread freshwater organisms belonging to the planktonic flora and preferring a neutral reaction of the environment. The Shannon index increased from 2.8 in the center of the lake to 3.3 in the trout farming area, which indicates good species diversity. The Sorensen index of 0.8 revealed the homogeneity between phytoplankton communities in different areas of the lake. Most of the identified types of saprobity indices belong to the representatives of the β-mesosaprobic and oligo-beta-mesosaprobic zones (up to 78% of the total number of identified indicator species). The saprobity index corresponded to the 2nd class of water purity (pure, α-oligosaprobic), which is due to the species composition of the dominant phytoplankton complex, however, the biomass indicates that the lake belongs to the 3rd class of water purity (satisfactorily clean, β-mesosaprobic).