Coupled Generation of Acoustic and Gravity Waves by Tropospheric Heat Sources

S. P. Kshevetskii; Кшевецкий С. П.; Yu. A. Kurdyaeva; Курдяева Ю. А.; N. M. Gavrilov; Гаврилов Н. М.

doi:10.31857/S0207401X23100096

Coupled Generation of Acoustic and Gravity Waves by Tropospheric Heat Sources

Authors: Kshevetskii S.P.¹^,2^,3, Kurdyaeva Y.A.⁴^,2, Gavrilov N.M.²
Affiliations:
1. Kant Baltic Federal University, Kaliningrad, Russia
2. St. Petersburg State University, St. Petersburg, Russia
3. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, Russia
4. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Kaliningrad Branch, Russian Academy of Sciences, Kaliningrad, Russia
Issue: Vol 42, No 10 (2023)
Pages: 77-90
Section: Химическая физика атмосферных явлений
URL: https://ruspoj.com/0207-401X/article/view/674821
DOI: https://doi.org/10.31857/S0207401X23100096
EDN: https://elibrary.ru/PGOETF
ID: 674821

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Abstract

The generation of acoustic-gravity waves by meteorological heat sources in the troposphere and the propagation of these waves to the heights of the upper atmosphere are studied theoretically. Equations that describe separately the generation and propagation of acoustic and gravity waves by a local heat source are derived. The heat source of the waves is divided into partial sources of gravity and acoustic waves (AWs). The power of these partial sources is estimated and it is shown that the power of the sources differs by about a factor of two, regardless of the shape, size, and frequency of the heat source. It is shown that in the case of heat sources of the waves, the generation of gravity waves cannot occur without the corresponding generation of AWs: these waves are generated only in pairs. The splitting of the problem of waves from a heat source into problems of waves from gravity and acoustic sources is illustrated by the direct modeling of these waves. The application of the obtained results to the problem of parametrization of acoustic-gravity waves in general circulation and climate models is discussed.

Keywords

internal gravity waves, acoustic waves, upper atmosphere, troposphere, thermosphere, meteorology

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