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Fluctuations in the angular momentum of the atmosphere and intraday irregularities in the Earth’s rotation

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Abstract

Numerical celestial-mechanical models are used to compare (andg interpolate and forecast) near-diurnal tidal variations in the Earth’s axial rotation and oscillations in the global angular momentum of the atmosphere using the IERS data and NCEP/NCAR meteorological data. In order to improve the accuracy of interpolations and forecasts made for short and intraday time intervals, it is expedient to include the effect of small perturbations in short-term zonal tides, which influence fluctuations in Universal Time UT1 directly related to the Earth’s rotation. Due to the quasi-static formulation of the problem, it is assumed that the dynamics of the thin surface atmosphere are completely determined by the gradient of the tide-generating geopotential, which supports forced oscillations of the entire subsystem (i.e., of the mantle and atmospheric envelope). A comparison of the numerical simulations with the NCEP/NCAR data shows that the model is effective for applications in forecasting atmospheric tides.

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References

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Authors and Affiliations

  1. Institute for Problems of Mechanics, Russian Academy of Sciences, pr. Vernadskogo 101, Moscow, 117526, Russia

    L. D. Akulenko

  2. Moscow Institute of Aviation, Volokolamskoe sh. 4, Moscow, 125080, Russia

    Yu. G. Markov & V. V. Perepelkin

  3. Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 109017, Russia

    L. V. Rykhlova

Authors
  1. L. D. Akulenko
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  2. Yu. G. Markov
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  3. V. V. Perepelkin
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  4. L. V. Rykhlova
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Original Russian Text © L.D. Akulenko, Yu.G. Markov, V.V. Perepelkin, L.V. Rykhlova, 2011, published in Astronomicheskii Zhurnal, 2011, Vol. 88, No. 9, pp. 920–928.

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Akulenko, L.D., Markov, Y.G., Perepelkin, V.V. et al. Fluctuations in the angular momentum of the atmosphere and intraday irregularities in the Earth’s rotation. Astron. Rep. 55, 849–856 (2011). https://doi.org/10.1134/S1063772911080014

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  • DOI: https://doi.org/10.1134/S1063772911080014

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