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- W2608996593 abstract "Research of polar lakes helps to obtain a new in information about limnic process in Polar Regions. Itis well known - that these areas are most sensitive toclimate change, and therefore even a small shift of theimportant parameters in aquatic environments canplay a huge role for water ecosystems.The thermic regime of polar lakes has its own peculiarities.The water temperature variability in polarlakes usually ranges between 0 and 18 °C , the icecoverthickness can reach up to 2 m. The freeze-upusually occurs in the first month of autumn, the breakingup of ice starts beginning of June.Current studies present the particularities of thethermokarst lakes and their thermic regime. Thethermal regime was modelled using the thermohydrodynamicmodel “Flake” developed by Russian – Germanresearch team (www.lakemodel.net). Inputdata for this model are meteorological characteristicsas well as lake morphometric measurements.Except climatic parameters what else is the thermicregime of lakes affected by? In our opinion, the heatturnover in the lacustrine sediments of the lake is oneof the important processes that can give an additionalthermic information. Lacustrine sediments representa specific bottom “sediment chuck” between lake waterbody and a depression. Sediment properties suchas thickness, humidity, grain-size, organic content andgeochemical composition, significantly determine thephysical characteristics that influence the lacustrinethermal regime. The thickness of the lacustrine bottomsediment is one of the important characteristicsfor lake thermal regime modeling,especially in the lakes of the Arctic permafrostregions . This parameter is included in the aforementionedthermodynamic model. Numerical experimentswere conducted to test the impact of sediment thicknesson the thermal regime. Thickness of the lacustrinesediments were varied from 1 m to 5 m. Modeledresults show that the dynamics of the thermic fluxeswere similar for sediments with thicknesses of 3 m and5 m. The maximum positive heat flux was calculatedfor a thickness of 3 m. The highest negative thermicflux was calculated for a sediment thickness of 1 m. Indeep reservoirs, bottom sediments significantly slowdown the freezing of the reservoir, sinceheat accumulates during the summer period. Otherphysical characteristics of bottom sediments also affectthe thermal regime of lakes. For example, wet bottomsediments warm slower because of their low heatcapacity. The destruction of organic matter in thewater also influences the thermal regime. Heat flowfrom the organic matter decomposition in sediments,can be quite significant. In the framework of thisstudy, the mechanisms heat flow in lacustrine bottomsediments are analyzed and their parameterization inthermic modeling tested." @default.
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- W2608996593 date "2016-01-01" @default.
- W2608996593 modified "2023-09-25" @default.
- W2608996593 title "Sediment-water interaction as an important factor of Arctic lake thermic regime" @default.
- W2608996593 hasPublicationYear "2016" @default.
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