TY  - JOUR
AU  - Roman Sulzbach, Hartmut Wziontek
PY  - 2022//
TI  - Modeling gravimetric signatures of third-degree ocean tides and their detection in superconducting gravimeter records
KW  - Degree-3 tides Superconducting gravimetry Tidal analysis Tidal modeling Tide gauge data
N2  - 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 $$= 0.01 \frac{\text {nm}}{\text {s}^2}$$) 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.
SN  - 1432-1394
UR  - http://dx.doi.org/10.1007/s00190-022-01609-w
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=8578), last updated on Mon, 01 Jul 2024 20:01:21 +0200
ID  - RomanSulzbach2022
ER  -