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5Climate system modeling and some methods diagnostic of midlatitude extreme weather in Northern
Hemisphere
G. Platov1,2, V. Gradov2, I. Borovko1, E. Volodin3, V. Krupchatnikov1,2
1Institute Computational Mathematics and Mathematical Geophysics SB RAS
2Novosibirsk State University
3Marchuk 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. Pyanova1, V. V. Penenko1, A. V. Gochakov2
1Institute of Computational Mathematics and Mathematical Geophysics SB RAS
2Siberian 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-
tions were performed on the basis of the mesoscale model of atmospheric dynamics developed in the ICMMG
SB RAS. The initial distributions of the fields of meteorological elements and the conditions at the upper
boundary of the modeling domain were set from the calculations of the COSMO-SIB6 prognostic mesoscale
model.
The work on the development of basic mathematical models is carried out within the framework of the state task of
the ICMMG SB RAS No. 0251-2021-0003. The implementation of special scenarios for solving the problems of continua-
tion is supported by the RFBR under grant No. 20-01-00560.
Numerical analysis of the processes of aerosol pollution of the Baikal natural territory
V. F. Raputa1, V. I. Grebenshchikova 2, A. A. Lezhenin1, T. V. Yaroslavtseva1, R. A. Amikishieva1
1Institute of Computational Mathematics and Mathematical Geophysics SB RAS
2Vinogradov Institute of Geochemistry SB RAS
Email: raputa@sscc.ru
DOI 10.24412/cl-35065-2021-1-01-47
Using model descriptions of the processes of atmospheric transport of impurities and data from monitor-
ing studies of pollution of vegetation and snow cover of the Baikal natural territory (BNT), the formulation of
problems of low-parameter estimation of concentration fields and characteristics of sources is discussed. To
increase the stability of the solutions of the considered inverse problems, algorithms for optimizing the place-
ment and assessing the information content of monitoring systems are used.
Examples of approbation of the proposed methods for assessing pollution fields in the vicinity of large in-
dustrial facilities of BNT are given. The quality of the obtained results is checked by comparing the measured
and calculated concentrations of impurities at the control points of observation, comparing the experimental
and numerical results with the data of satellite observations.
The work was supported by the Ministry of Science and Higher Education of the Russian Federation, the grant
No. 075-15-2020-787for implementation of Major scientific projects on priority areas of scientific and technological de-
velopment (the project "Fundamentals, methods and technologies for digital monitoring and forecasting of the environ-
mental situation on the Baikal natural territory").
Joint realisation of algorithms for variational assimilation of salinity, temperature and sea level at the open
boundary
T. O. Sheloput1,2, V. I. Agoshkov1,3
1Marchuk Institute of Numerical Mathematics RAS
2Moscow Institute of Physics and Technology
3Lomonosov Moscow State University
Email: sheloput@phystech.edu
DOI 10.24412/cl-35065-2021-1-01-48
An approach to taking into account open boundaries in hydrothermodynamics modeling, based on the
theory of inverse problems, the use of adjoint equations and methods of variational data assimilation, is con-
sidered. The formulation of boundary conditions at open boundaries is an actual problem in the modeling of
circulation of seas, bays and other open water objects. The algorithms for variational assimilation of salinity,
temperature and sea level [1] at the open boundary are presented, the results of the numerical experiment on
their joint realisation in the hydrodynamics model are discussed. The simulation results are compared with the
observational data from various sources.
