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GENERATION OF HEAT WAVES BY PLANETARY WAVES OF ROSSBY

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Hydrometeorology and environmental monitoring

Hydrometeorology and environmental monitoring

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ARTICLE ANNOTATION

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The observed positive temperature trend and the associated increase in the frequency and intensity of heat waves are due to the atmosphere's own oscillations of the second kind (Rossby waves), or more precisely, the interaction of Rossby waves with jet streams. At the latitudes of Central Asia, circumglobal Rossby waves are associated with a highly sinuous jet stream and can cause simultaneous heat waves and floods not only in this region, but throughout the entire Northern Hemisphere. This article provides a review of works devoted to the study of heat waves generated by Rossby waves due to the inhibition of the westerly transport with the formation of omega blocking (blocking process), causing significant warming in some areas of the region and flooding in neighboring areas. The characteristic lengths of Rossby waves in January and July for the northern and southern hemispheres of the planet are obtained. It is shown that the planetary wave equation obtained by Rossby is applicable only to harmonic waves propagating without changing their shape in linear media. Since the processes of interaction of Rossby waves with jet streams are essentially nonlinear, the phase velocity of the wave is a function of frequency, i.e. the determining factor is the velocity dispersion, which means that it is necessary to consider the group velocity and the wave front velocity. The equation of dispersion of gravity-gyroscopic waves is presented, which in the high-frequency region of the spectrum expresses the dispersion law of gravity-gyroscopic waves, and in the low-frequency region - the dispersion law of Rossby waves.

AUTHORS

M.Arushanov

Научно-исследовательский гидрометеорологический институт

Tags

# heat waves# волны Россби# струйное течение# волны тепла# омега-блокинг# западный перенос# дисперсионное уравнение.# Россби тўлқинлари# найсимон оқим# иссиқлик тўлқинлари# ғарбий оқим# дисперсия тенгламаси.# Rossby waves# jet stream# omega blocking# westerly transport# dispersion equation.

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Article Identifiers

ROI:

https://eroi.uz/11.0191/A0225-0003

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