On the Influence of Diurnal and Subdiurnal Signals in the Normal Vector on Large Ring Laser Gyroscope Observations

Monika Tercjak , André Gebauer , Marcin Rajner , Aleksander Brzeziński , Karl Ulrich Schreiber

Abstract

The ring laser gyroscope (RLG) technique has been investigated for over 20 years as a potential complement to space geodetic techniques in measuring Earth rotation. However, RLGs are also sensitive to changes in their terrestrial orientation. Therefore in this paper, we review how the high-frequency band (i.e. signals shorter than 0.5 cycle per day) of the known phenomena causing site deformation contribute to the RLG observable, the Sagnac frequency. We study the impact of solid Earth tides, ocean tidal loading and non-tidal loading phenomena (atmospheric pressure loading and continental hydrosphere loading). Also, we evaluate the differences between available models of the phenomena and the importance of the Love numbers used in modeling the impact of solid Earth tides. Finally, we compare modeled variations in the instrument orientation with the ones observed with a tiltmeter. Our results prove that at the present accuracy of the RLG technique, solid Earth tides and ocean tidal loading effects have significant effect on RLG measurements, and continental hydrosphere loading can be actually neglected. Regarding the atmospheric loading model, its application might introduce some undesired signals. We also show that discrepancies arising from the use of different models can be neglected, and there is almost no impact arising from the use of different Love numbers. Finally, we discuss differences between data reduced with tiltmeter observations and these reduced with modeled signal, and potential causes of this discrepancies.

Author Monika Tercjak (FGC / CGGA)
Monika Tercjak,,
- Chair of Geodesy and Geodetic Astronomy
, André Gebauer - [Technical University of Munich]
André Gebauer,,
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, Marcin Rajner (FGC / CGGA)
Marcin Rajner,,
- Chair of Geodesy and Geodetic Astronomy
, Aleksander Brzeziński (FGC / CGGA)
Aleksander Brzeziński,,
- Chair of Geodesy and Geodetic Astronomy
, Karl Ulrich Schreiber - [Technical University of Munich]
Karl Ulrich Schreiber,,
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Journal seriesPure and Applied Geophysics, ISSN 0033-4553, e-ISSN 1420-9136
Issue year2020
Pages1-12
Publication size in sheets0.55
Keywords in EnglishRing laser gyroscope, Sagnac frequency, solidEarth tides, ocean tidal loading, non-tidal loading effects, Lovenumbers
ASJC Classification1906 Geochemistry and Petrology; 1908 Geophysics
DOIDOI:10.1007/s00024-020-02484-2
Internal identifier20/2020
Languageen angielski
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 01-07-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.976; WoS Impact Factor: 2018 = 1.466 (2) - 2018=1.64 (5)
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