Study of the influence of meteorological factors on the parameters of the main tidal waves in the NS direction

• Date: 2026
• Main Authors: Kutnyi, Andrii, Pavlyk, Volodymyr, Kutnyi, Bogdan, Babych, Tetiana
• Format: Article
• Language: Ukrainian
• Published: S. Subbotin Institute of Geophysics of the NAS of Ukraine 2026
• Subjects: earth tides; tiltmeter observations; temperature and barometric observations; tidal harmonic analysis; thermoelastic deformations; reliable geophysical information
• Online Access: https://journals.uran.ua/geofizicheskiy/article/view/349607
• Journal Title: Geofizicheskiy Zhurnal

In order to identify the influence of meteorological factors on the parameters of the main tidal waves of tilt, which have important geophysical significance, hourly series of 11-year tiltmeter observations in Poltava for the NS direction and similar 10-year series of air temperature and atmospheric pressure were processed by tidal harmonic analysis. Significant systematic disturbances of the parameters of the main tidal waves and the phase delay of the daily disturbing tilt of the ground in relation to the air temperature were revealed, which in January—March is 3 hours, and in May—December — 6 hours. It was established that the causes of systematic disturbances of the tidal parameters are deformation processes of the soil layer at a depth of 0.10—0.25 m, which are caused by local exogenous and endogenous factors, among which the main role is played by the instability of the thermal field, soil moisture and the length of thermal waves in the vicinity of the tiltmeter point. The possibility of freeing the parameters of daily tidal waves from systematic temperature disturbances by involving the theory of thermoelastic deformations, physical properties of the soil, and temperature field parameters is shown. Thus, for the K1 wave, the difference in amplitudes and phase shifts between the temperature perturbing tilts obtained from observations and those calculated on the basis of the theory of thermoelastic deformations turned out to be practically absent in the average annual measurement. This convincingly indicates the possibility and necessity of cleaning the observed data from the systematic influence of temperature disturbances in order to obtain reliable geophysical information. It was established that atmospheric pressure practically does not affect the parameters of semidiurnal and diurnal tidal waves of lunar origin. The obtained results convincingly indicate the influence of atmospheric pressure on both the amplitude and the phase of the tidal wave of solar origin S2.