ИСТИНА

This abstract presents the land surface model (LSM) jointly developed by Institute of Numerical Mathematics (INM) RAS and Moscow State University (MSU) and used in the INMCM Earth System model (Volodin et al., 2017), participating in the CMIP (Coupled Model Intercomparison Project) series of climate simulations. The basis of INM RAS-MSU LSM is a soil model computing vertical distribution of temperature, liquid water, ice and water vapor content in each land grid cell of the ESM (Volodin and Lykosov, 1998). Heat and moisture transfer equations are discretized at 23 levels in soil, whereas for heat and moisture transport in snow, 4 levels are used. Each land grid cell is composed of 5 possible surface types: dry vegetation, vegetation covered by intercepted precipitation, bare soil, snow and inland waters. Inland water area and depth are adapted from GLDBv2 dataset. Thermodynamic state of lakes is simulated by simplified version of 1D LAKE model (Bogomolov et al., 2016). The model participates in the Lake sector of ISIMIP project (www.isimip.org). So far, lake temperature, ice and energy fluxes are simulated under picontrol, historical, RCP2.6, RCP6.0, RCP8.5 scenarios as prescribed by ISIMIP2b protocol. Biogeochemical block of the lake model is validated at a number of lakes; current issues towards its implementation in the LSM are discussed. The novel river module consists of diffusive wave equation model for dynamics and heat balance equation to compute river temperature (Stepanenko et al., 2019). The effect of inclusion of river module together with the new snowmelt scheme was significant improvement of seasonal cycle of water runoff of Severnaya Dvina river (North of European Russia). The work is supported by Russian Foundation for Basic Research, grants 20-05-00773, 18-05-60126, 18-05-00306. References: Bogomolov, V., Stepanenko, V. & Volodin, E. Development of lake parametrization in the INMCM climate model. IOP Conf. Ser. Earth Environ. Sci. 48, 12005 (2016), DOI:10.1088/1755-1315/48/1/012005. Volodin, E.M. & Lykosov, V. N. Parameterization of heat and moisture exchange in a “soil-vegetation” system for general atmospheric circulation modeling. Part 2. Numerical climate simulation (in Russian). Izvestiya - Atmospheric and Oceanic Physics, Vol. 34, pp. 622–633, 1998. Volodin E.M., Mortikov E. V., Kostrykin S. V., Galin V.Y., Lykossov V.N., Gritsun A.S., Diansky N.A., Gusev A. V., Iakovlev N.G. Simulation of the present-day climate with the climate model INMCM5 // Clim. Dyn. 2017. Vol. 49. No. 11–12. pp. 3715–3734, DOI:10.1007/s00382-017-3539-7. Stepanenko V.M., Medvedev A.I., Korpushenkov I.A., Frolova N.L., and Lykosov V.N. A river routing scheme for an Earth system model (in Russian). Numerical Methods and Programming. Vol.20, pp. 396-410, 2019. doi:10.26089/NumMet.v20r435