Some scenario calculations of the local atmospheric circulation in the Krasnoyarsk city and its visinity are carried out based on a mesoscale non-hydrostatic model of atmospheric dynamics. To simulate the mesoclimate of the area, the processes of formation and evolution of near-surface and elevated temperature inversions are studied. The results of the calculations show the behavior of inversion layers in the urban atmosphere due to of interaction of the large-scale atmospheric fields and the orographic and thermal features of the underling surface.
Summer scenarios simulating impurity transport in the Baikal region are considered. The tracers’ distribution from the locations of forest wildfires in July-August 2019 is calculated with the ICM&MG SB RAS mesoscale model of atmospheric dynamics and admixture transport. The same meteorological scenarios are used to estimate the distribution of pollutants from emissions of boiler houses and thermal power plants in the region. The results demonstrate that smog from forest fires and industrial sources lead to the significant load on the atmosphere of the region.
The paper presents some results of a numerical scenario on pollutants dispersion in the south of the Lake Baikal region. We used the scenario approach and simulated the case corresponding to the late fall or early winter. At this time, in Eastern Siberia, low temperatures are established in the atmosphere and on the ground. However, Lake Baikal is not yet covered with ice: according to climatic data, ice cover appears only in January. Therefore, a situation arises when large temperature gradients between land and lake form in vast areas of the region. Under such conditions, we examined the formation of atmospheric circulation in the Baikal region. To describe the meteorological processes, we use a mesoscale model for the dynamics of the atmosphere, developed in ICMMG SB RAS. Performing the scenario, we use the results of the COSMO-SIB6 predictive mesoscale model to specify the initial distributions of meteorological fields. Based on hydrodynamic processes, we also simulated the processes of impurity propagation from the sources of the Irkutsk-Cheremkhovo industrial hub and other major industrial centers in the region. Under the conditions of the considered winter scenario with north-west background flow, the calculation results showed that the lightweight impurities from high sources at the enterprises of the region not only from Irkutsk, but also from more distant enterprises of the Angarsk complex can reach the water area of Lake Baikal.
The results of simulation scenarios of passive impurities transport in the city of Krasnoyarsk during the warm and cold periods are presented. The calculations are based on a mesoscale non-hydrostatic model. The purpose of the ongoing research is to study the characteristics of the formation of mesoclimates in Krasnoyarsk, a description of the characteristic meteorological conditions and an assessment of their impact on the accumulation of impurities in the urban atmosphere. We concentrate on meteorological scenarios with weak winds, since such conditions are most unfavorable from the point of view of the accumulation of impurities in the lower atmosphere. Under these conditions, we compare scenarios of the distribution of impurities from high sources. Numerical experiments with the parameters we chose showed that there was no significant effect of high sources of impurities on the accumulation of pollution in the surface layer, both in the conditions of winter surface inversions and in summer conditions. The differences are in the level of concentrations and their localization: in winter, the concentrations are higher and the areas of distribution are smaller, while in summer, the areas are larger and the concentrations are smaller. In summer, in contrast to the winter, diurnal variability is more pronounced. The daily rotation of the plumes is due to the formation of local circulations like mountain-valley type.
The work is focused on studying the features of local circulation formation and impurity transport processes in the Baikal region. To carry out the research, we use the basic numerical mesoscale model of the atmospheric dynamics and impurity transport in regions with complex relief, developed at the ICMMG SB RAS. On its basis, we created a special version of the model adapted to the climatic and orographic conditions of the region. The results of a numerical experiment on modeling the transport of a smoke tracer under the conditions of a summer meteorological scenario are presented.
This work is dedicated to the studies of peculiarities of local circulations and pollutants transport in urban area. The research is fulfilled by means of a numerical mesoscale model of atmosphere dynamics and a model of pollutants transport in the orographically complex areas. The results of numerical experiments for winter meteorological scenarios made in the framework of Krasnoyarsk mesoclimate description are represented.
This paper presents a meso-scale non-hydrostatic model of atmospheric dynamics and some scenario calculations on formation of the local atmospheric circulations near the city of Krasnoyarsk. The results of numerical experiments are presented for summer and winter meteorological scenarios performed as a study of mesoclimates of the city and its surroundings. Using the numerical model it was possible to reproduce the processes of formation and development of the surface and elevated temperature inversions in the atmosphere of the territory in question. Experiments with basic state winds have shown that the orographic and thermal inhomogeneities of the underlying surface considerably transform the large-scale basic state flux.
KEYWORDS: Atmospheric modeling, Meteorology, Solar radiation models, Computer simulations, Motion models, Solar radiation, Atmospheric physics, Data modeling, Pollution, Basic research
The results of scenario estimation of summer conditions for the formation of atmospheric circulations and transport of pollutants of natural and anthropogenic origin in the Baikal region atmosphere and over the Baikal water area are presented. Possible changes in air quality are studied with a mesoscale nonhydrostatic model of atmospheric dynamics and pollutant transport. The investigation has revealed some meteorological situations that are unfavorable for air quality in the Baikal region and over its water area.
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