GEOPHYSICAL RESEARCH, 2020, vol. 21, no. 3, pp. 5-18. https://doi.org/10.21455/gr2020.3-1
UDC 550.34.01
Abstract References Full text (in Russian) Full text (in English)
PRELIMINARY RESULTS OF THE ATMOSPHERIC GRAVIMETRIC EFFECT CALCULATIONS
E.A. Spiridonov, O.Yu. Vinogradova
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
Abstract. Preliminary results of calculation of the atmospheric gravimetric effect for 2006 are presented. The calculation was based on the spherical expansion of the surface atmospheric pressure fields of the European reanalysis project ERA5, according to the method described in [Spiridonov, 2019]. This technique involves the calculation of the sum of the atmospheric loading effect and direct Newtonian attraction created by the air masses.
Comparison of the calculated time series of the effect with observational data on six superconducting gravimeters of the Global Geodynamic Project (GGP) network located in Bad Homburg, Medicina, Membach, Moxa, Strasbourg and Vienna, as well as with the series taken from the EOST website was carried out.
To remove the tide in the inelastic rotating self-gravitating Earth with the ocean from the series of observations the program ATLANTIDA3.1_2017 was used [Spiridonov et al., 2017]. The amplitude delta-factors of tidal waves for this program were calculated in [Spiridonov, 2017], and the loading delta-factors used in the calculation of the ocean load effect are shown in [Spiridonov, Vinogradova, 2017]. To calculate the oceanic gravimetric effect the oceanic tidal model FES2012 was applied.
The analysis of the results of calculating the atmospheric gravimetric effect obtained both with and without taking into account the inverted barometer effect is carried out.
The standard deviations of the difference series obtained by subtracting from the series of observations the dynamic tide, the ocean effect, and the atmospheric effect calculated in this work do not exceed 0.2–0.3 μGal in the period range from 4 to 60 days.
Keywords: Earth’s tides, atmospheric gravimetric effect, atmospheric gravitational attraction, atmospheric loading effect.
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