Modeling gravimetric signatures of third-degree ocean tides and their detection in superconducting gravimeter records
Artikel i vetenskaplig tidskrift, 2022

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 rootmean-square (RMS) deviation of 0.9–1.3mm 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 nm/s2 ) 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.

Tidal analysis

Superconducting gravimetry

Tide gauge data

Tidal modeling

Degree-3 tides

Författare

Roman Sulzbach

Deutsches GeoForschungsZentrum (GFZ)

Hartmut Wziontek

Bundesamt für Kartographie und Geodäsie (BKG)

Michael Hart-Davis

Deutsches Geodätisches Forschungsinstitut (DGFI)

Henryk Dobslaw

Deutsches GeoForschungsZentrum (GFZ)

Hans-Georg Scherneck

Chalmers, Rymd-, geo- och miljövetenskap, Geovetenskap och fjärranalys

Michel van Camp

Royal Observatory of Belgium

Ove Christian Dahl Omang

Kartverket

Ezequiel D. Antokoletz

Universidad Nacional de La Plata

Christian Voigt

Deutsches GeoForschungsZentrum (GFZ)

Denise Dettmering

Deutsches Geodätisches Forschungsinstitut (DGFI)

Maik Thomas

Deutsches GeoForschungsZentrum (GFZ)

Journal of Geodesy

0949-7714 (ISSN) 1432-1394 (eISSN)

Vol. 96 35

Fundament

Grundläggande vetenskaper

Infrastruktur

Onsala rymdobservatorium

Ämneskategorier

Geofysik

DOI

10.1007/s00190-022-01609-w

Mer information

Senast uppdaterat

2022-05-12