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Short-period normal modes of the atmosphere

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Abstract

To our knowledge, this is the first study to calculate the frequencies of the gravity-inertia normal modes of the atmosphere in the ∼1- to 5-h period range. The frequencies are calculated within the classical linear theory of planetary waves. Atmospheric normal modes (ANMs) characterized by the same sum of the zonal wavenumber and meridional index cluster within certain frequency ranges separated by no-ANM intervals. With the increase in the said sum, the length of the latter intervals increases due to the decreasing length of the former ones. The ANM frequency distribution in the period range being studied shows a periodicity with a theoretically predicted period of ∼7 μHz, which is evidence of the actual existence of ANMs.

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Authors and Affiliations

  1. St. Petersburg State University, ul. Ul’yanovskaya 1, Petrodvorets, St. Petersburg, 198504, Russia

    T. M. Beliaev & G. M. Shved

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  1. T. M. Beliaev
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  2. G. M. Shved
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Correspondence to G. M. Shved.

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Original Russian Text © T.M. Beliaev, G.M. Shved, 2014, published in Izvestiya AN. Fizika Atmosfery i Okeana, 2014, Vol. 50, No. 6, pp. 639–646.

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Beliaev, T.M., Shved, G.M. Short-period normal modes of the atmosphere. Izv. Atmos. Ocean. Phys. 50, 562–568 (2014). https://doi.org/10.1134/S0001433814060048

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  • DOI: https://doi.org/10.1134/S0001433814060048

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