Sulzbach, R. ; Wziontek, H. ; Hart-Davis, M. ; Dobslaw, H. ; Scherneck, H.-G. ; Van Camp, M. ; Omang, O.C.D. ; Antokoletz, E.D. ; Voigt, C. ; Dettmering, D. ; Thomas, M.

published in Journal of Geodesy, 96 issue 35 (2022)

Abstract: We employ the barotropic, data-unconstrained ocean tide model TiME to derive an atlas for degree-3 tidal constituents including monthly to terdiurnal tidal species. The model is optimized with respect to the tide gauge data set TICON-td that is extended to include the respective tidal constituents of diurnal and higher frequencies. The tide gauge validation shows a root-mean-square (RMS) deviation of 0.9–1.3 mm for the individual species. We further model the load tide-induced gravimetric signals by two means (1) a global load Love number approach and (2) evaluating Greens-integrals at 16 selected locations of superconducting gravimeters. The RMS deviation between the amplitudes derived using both methods is below 0.5 nGal (1 nGal =0.01 nms-2) when excluding near-coastal gravimeters. Utilizing ETERNA-x, a recently upgraded and reworked tidal analysis software, we additionally derive degree-3 gravimetric tidal constituents for these stations, based on a hypothesis-free wave grouping approach. We demonstrate that this analysis is feasible, yielding amplitude predictions of only a few 10 nGal, and that it agrees with the modeled constituents on a level of 63–80% of the mean signal amplitude. Larger deviations are only found for lowest amplitude signals, near-coastal stations, or shorter and noisier data sets.

Keyword(s): Third-degree ocean tides ; Tidal potential ; Superconducting gravimeters ; Membach
DOI: 10.1007/s00190-022-01609-w
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