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• W2294915935 abstract "For modelling permafrost and its response to a changing climate the soil thermal propertiesare crucial parameters. Those properties include the thermal conductivity, the thermaldiffusivity and the heat capacity of the ground. However, in the vast Arctic region data onthermal soil properties are only sparsely available. Therefore scientists try to simulateprocesses that are not measurable or require much effort. The results show that the model,which fittest least to measured data, is the one developed by Johansen (1975). Neverthelessit is the most widely used in the land surface schemes of large-scale climate models sincethe input parameters, i.e. the organic content and the grain size distribution of the soil, arecomparatively easy to obtain. On the other hand output data from this model differ by a factorof 1.2 or 20% from the measured values which means that the ground heat flux used forclimate scenarios has an offset of that range to reality. A better solution would be to use themodel of de Vries (1952). It requires more detailed knowledge about the soil composition andthe several constituents. Requiring spatial information about these parameters is necessarywhen trying to incorporate the model into regional and global simulations but poses achallenging tasks for large regions and especially the remote Arctic areas. Using a simple butinadequate model like Johansen, however, largely biases modeling results of ground heatflux which is a crucial parameter in projections of future Arctic climate change. Correctparametrization of local soil parameters as implemented in the de Vries model are essentialto adequately represent soil spatial heterogeneity in permafrost terrain and associatedprocesses." @default.
• W2294915935 created "2016-06-24" @default.
• W2294915935 creator A5009001563 @default.
• W2294915935 date "2011-06-01" @default.
• W2294915935 modified "2023-09-23" @default.
• W2294915935 title "Measuring and modeling of soil thermal properties and ground heat flux at two different sites at Lena Delta, Siberia" @default.
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• W2294915935 hasPublicationYear "2011" @default.
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