Calculation of stratification effects and parameters of atmospheric  currents over steep surface obstacles

M. S. Yudin

doi:10.1117/12.2575567

12 November 2020 Calculation of stratification effects and parameters of atmospheric currents over steep surface obstacles

M. S. Yudin

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Proceedings Volume 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics; 1156070 (2020) https://doi.org/10.1117/12.2575567
Event: 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 2020, Moscow, Russian Federation

Abstract

An overview of recent author’s studies and newer results are given on atmospheric gravity currents over steep surface obstacles: for this goal a finite-element model of compressible atmosphere is used. The gravity flows simulated by the model in these studies are atmospheric fronts, which are of interest both from theoretical and practical viewpoints. One of the possible applications is modeling the effects of atmospheric fronts (specifically, cold fronts) on aerosols that are active in the atmosphere, such as ozone. These studies have been carried out with a special equation introduced into the finite-element model to describe the time variation of the front surface. The model has been subjected to a variety of tests. The front speed calculated with the model in neutral atmosphere has been compared with an empirical formula well-known in the theory of atmospheric flows. In other tests, the model has been employed to simulate flows past steep obstacles like valley or hill. Wind speed before and past obstacles of various shapes has been calculated and compared with available measurements and results of simulations performed by other authors. The effects of stratification on various parameters of front propagation have been assessed from the results of the simulations. Also, the effects on the front speed of introducing a layer of stratification inversion into a stably stratified atmosphere have been studied. The inversion layer changes the pattern of front propagation by decreasing the front speed before and after a steep obstacle as well as the speed of front propagation over a plane surface. The well-observed phenomenon of striking difference in the behavior of surface pressure in front propagation under stable and neutral versions of atmospheric stratification has been obtained and compared with observations.

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M. S. Yudin "Calculation of stratification effects and parameters of atmospheric currents over steep surface obstacles", Proc. SPIE 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 1156070 (12 November 2020); https://doi.org/10.1117/12.2575567

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KEYWORDS

Atmospheric modeling

Atmospheric propagation

Atmospheric particles

Finite element methods

Mathematical modeling

Aerosols

Numerical simulations

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