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Reduction of apparent temporal variations of tidal parameters by a proper local response model

Ciesielski, Adam ORCID iD icon 1,2; Forbriger, Thomas ORCID iD icon 2,3; Zürn, Walter 2,3; Rietbrock, Andreas ORCID iD icon 2
1 Geodätisches Institut (GIK), Karlsruher Institut für Technologie (KIT)
2 Geophysikalisches Institut (GPI), Karlsruher Institut für Technologie (KIT)
3 Fakultät für Physik – Geowissenschaftliches Gemeinschaftsobservatorium Schiltach (Schiltach), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

We describe a new harmonic tidal analysis method, which constrains the solution to be near a reference model. This regularization stabilizes the linear regression, allowing us to infer model parameters for each tidal harmonic. This overcomes the need to create a priori groupings of harmonics. The inversion is done iteratively by adjusting the reference model to reduce the data misfit. The frequency dependence of the solution is thus data-driven. We find models for the different spherical degrees independently. Our procedure allows narrow-band variations of the tidal admittance. We test the hypothesis that some of the temporal variations of tidal parameters found in previous studies were caused by inappropriate body tide models in combination with a priori wave grouping. We determine a local response model from 11.5 years of data recorded by the superconducting gravimeter SG056 at Black Forest Observatory (BFO, Schiltach). Using this as an a priori model in a non-regularized moving window analysis of wave groups composed from summed harmonics, we find that periodic variations of groups M1, K1, μ2, N2, L2, and S2 are reduced by up to a factor of 7 compared to earlier studies. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000162150
Veröffentlicht am 13.09.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Geodätisches Institut (GIK)
Geophysikalisches Institut (GPI)
Fakultät für Physik – Geowissenschaftliches Gemeinschaftsobservatorium Schiltach (Schiltach)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2023
Sprache Englisch
Identifikator ISSN: 0949-7714, 1432-1394
KITopen-ID: 1000162150
Erschienen in Journal of Geodesy
Verlag Springer-Verlag
Band 97
Heft 9
Seiten Art.-Nr.: 82
Vorab online veröffentlicht am 12.09.2023
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