GEOPHYSICAL RESEARCH, 2017, vol. 18, no. 3, pp. 67-80. DOI: 10.21455/gr2017.3-6
UDC 550.3; 550.4
Abstract References Full text (in Russian) Full text (in English)
TIDAL WAVES AND PRESSURE VARIATIONS IN THE EARTH'S ATMOSPHERE
V.V. Adushkin, A.A. Spivak, Yu.S. Rybnov, V.A. Kharlamov
Institute of Geosphere Dynamics, Russian Academy of Sciences, Moscow, Russia
Abstract. The results of instrumental observations carried out at the geophysical observatory “Mikhnevo” and in the Center of geophysical monitoring, Institute of Geosphere Dynamics, RAS, Moscow during 2008–2015 are analyzed. The purpose of observations was to investigate the influence of the lunar-solar tide on the atmospheric pressure variations.
Atmospheric pressure variations were recorded at the frequency range of 10(-4)–10(2) Hz. Their spectral characteristics were estimated on the basis of the parametric autoregression method. The narrowband adaptive band-stop filters were applied for more qualitative separation of tidal waves with close periods. As a result of data processing, the basic tidal waves with diurnal and semi-diurnal periods were distinguished.
Diurnal and semi-diurnal harmonics of atmospheric pressure variations are accompanied by side equidistant spectrum lines, which directly confirm the modulation of these spectral components. The modulation periods of corresponding tidal waves are about 13.6 and 27.5 days, as well as 1/3, 1/2, and 1 year. The modulation depth of the tidal wave S1 by the annual harmonic is about 0.9 and by the semi-annual is about 0.2. For the tidal waves S2, K2, R2, T2, and l2, it can be estimated as ~0.5 and ~0.15 accordingly.
Keywords: instrumental observations, atmospheric pressure, lunar-solar tide, tidal waves in atmosphere.
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