110 Section 4 Climate system modeling and some methods diagnostic of midlatitude extreme weather in Northern Hemisphere G. Platov 1,2 , V. Gradov 2 , I. Borovko 1 , E. Volodin 3 , V. Krupchatnikov 1,2 1 Institute Computational Mathematics and Mathematical Geophysics SB RAS 2 Novosibirsk State University 3 Marchuk Institute of numerical mathematics RAS Email: vkrupchatnikov@yandex.ru DOI 10.24412/cl-35065-2021-1-01-45 Recent decades have seen accentuated warming and precipitous decline of sea ice in the Arctic, in keeping with the so-called Arctic amplification anticipated from the increasing greenhouse gas forcing. Accompanying the Arctic change are the more frequently observed weather extremes in the Northern Hemi- sphere midlatitudes. Locations for the occurrence of weather extremes and their trends and a better under- standing of their regional impact on weather is importance. Circulation pattern that can lead to such extremes, the blocking event, is a synoptic-scale phenomenon that blocks the jet stream, resulting in persistent weather. Atmospheric blocking has received attention for many decades and is still very much a topic of actuality because of its relationship to extreme weather. Recently, [2] have proposed local wave activity (LWA) as a diagnostic of local wave anomalies and blocking events. LWA is a generalization of the finite-amplitude wave activity theory [3] into its local counterpart, quantifying waviness as a function of latitude and longitude, and is capable of measur- ing regional disturbances in the atmospheric circulation. In this work we quantifies LWA using Z500, which has been used to diagnose weather extremes in the troposphere such as blocking events [4–6]. The study used the INM-CM48 climate system model [1], developed at the INM RAS and taking into account many factors of climate change. This research was funded by Russian Science Foundation grant number 19-17-00154. References 1. Volodin E.M., Mortikov E.V., Kostrykin S.V., Galin V.Ya, Lykossov V.N., Gritsun A.S., Diansky N.A., Gusev A.V., Iakovlev N.G., Shestakova A.A., Emelina S.V. Simulation of the modern climate using the INM-CM48 climate model // Russian J. of Numerical Analysis and Mathematical Modelling. 33(6), 367–374 (2018). 2. Huang, C. S.-Y., and N. Nakamura, 2016: Local finite-amplitude wave activity as a diagnostic of anomalous weather events. J. Atmos. Sci., 73, 211–229, . 3. Nakamura, N., and D. Zhu, 2010: Finite-amplitude wave activity and diffusive flux of potential vorticity in eddy – mean flow interaction. J. Atmos. Sci., 67, 2701–2716. 4. Tibaldi, S., and F. Molteni, 1990: On the operational predictability of blocking. Tellus, 42A, 343–365, doi:10.3402/tellusa.v42i3.11882. 5. Tyrlis, E., and B. J. Hoskins, 2008: Aspects of a Northern Hemisphere atmospheric blocking climatology. J. Atmos. Sci., 65, 1638–1652, doi:10.1175/2007JAS2337.1. 6. V N Krupchatnikov and I V Borovko 2020 IOP Conf. Ser.: Earth Environ. Sci. 611 012015. Modeling of admixture transport from Baikal region sources under winter atmospheric conditions E. A. Pyanova 1 , V. V. Penenko 1 , A. V. Gochakov 2 1 Institute of Computational Mathematics and Mathematical Geophysics SB RAS 2 Siberian Regional Hydrometeorological Research Institute Email: pyanova@ommgp.sscc.ru DOI 10.24412/cl-35065-2021-1-01-46 The report presents some scenarios for modeling the transport of impurities from high pipes of industrial enterprises and thermal power plants in the Baikal region in winter atmospheric conditions. Scenario calcula-