Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

*e-mail: sp287@mail.ru

Abstract. Calculation of the oceanic gravimetric effect by expanding the cotidal maps of the oceanic tidal model FES2014 into spherical functions using load Love numbers from [Spiridonov, Vinogradova, 2017] was performed. The results of calculating the amplitudes and phases of the oceanic gravimetric effect of eight main tidal waves (Q1, O1, P1, K1, N2, M2, S2 and K2) at nine European points of gravimetric observations of the Global Geophysical Project (GGP) network are shown. Predicted amplitude delta factors and phase shifts of these tidal waves for the Earth with the ocean are calculated and a comparison of their values with the observed values is made. Residual (predict minus observations) vectors are analyzed in detail. Moreover, both various theoretical tidal models and variants for calculating the oceanic effect were applied. The FES2014 model is included in the tidal prediction program ATLANTIDA3.1. From consideration of the results obtained in this work it follows first of all that the FES2014 model discussed here is one of the most advanced modern oceanic models. The values of the amplitude delta factors and phase shifts of tidal waves obtained with its help for the Earth with the ocean, when analyzed separately are generally in better agreement with observations than those obtained using the FES2012 model. This is especially evident in points «Strasbourg» and «Vienna». At the same time from the analysis of residual (theoretical forecast minus observations) vectors follows that in terms of proximity to observations FES2014 is slightly inferior to FES2012. This fact still requires an explanation. However, the differences in the amplitudes of the residual vectors obtained for the FES2012 and FES2014 models usually do not exceed a few hundredths of a percent of the tidal wave amplitudes. Such small differences can be associated with a number of factors that have nothing to do with the oceanic effect.

Keywords: oceanic gravimetric effect, Love load numbers, oceanic tide model FES2014b, tidal prediction program ATLANTIDA3.1.

About the authors

SPIRIDONOV Evgeny Alexandrovich – Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1. E-mail: sp287@mail.ru

VINOGRADOVA Olga Yurievna – Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1. E-mail: sp295@mail.ru

Cite this article as: Spiridonov E.A., Vinogradova O.Yu. Oceanic tidal model FES2014b: comparison with observed gravimetry data, Geofizicheskie Protsessy i Biosfera (Geophysical Processes and Biosphere), 2020, vol. 19, no. 4, pp. 127–142 (in Russian). https://doi.org/10.21455/gpb2020.4-9

English version: Izvestiya, Atmospheric and Oceanic Physics, 2020, vol. 56, iss. 11. ISSN: 0001-4338 (Print), 1555-628X (Online). https://link.springer.com/journal/volumesAndIssues/11485