On the Influence of Diurnal and Subdiurnal Signals in the Normal Vector on Large Ring Laser Gyroscope Observations
Artikel i vetenskaplig tidskrift, 2020

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.

Sagnac frequency

Ring laser gyroscope

ocean tidal loading

solid Earth tides

Love numbers

non-tidal loading effects

Författare

Monika Tercjak

Politechnika Warszawska

Andre Gebauer

Technische Universität München

Marcin Rajner

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Rymdgeodesi och geodynamik

Politechnika Warszawska

Aleksander Brzezinski

Politechnika Warszawska

Polish Academy of Sciences

Karl Ulrich Schreiber

Technische Universität München

Pure and Applied Geophysics

0033-4553 (ISSN) 1420-9136 (eISSN)

Vol. In Press

Ämneskategorier

Teknisk mekanik

Meteorologi och atmosfärforskning

Geofysik

DOI

10.1007/s00024-020-02484-2

Mer information

Senast uppdaterat

2020-07-01