Geodynamics and Earth Tides Observations from Global to Micro Scale: Introduction

Braitenberg, Carla; Rossi, G.; Bogusz, Janusz; Crescentini, Luca; Crossley, David; Gross, R. S.; Heki, Kosuke; Hinderer, J.; Jahr, T.; Meurers, Bruno; Schuh, Harald

doi:10.1007/s00024-018-1875-0

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…The classical Earth Tide Symposia were held since 1957, the 18 th was the first with the word "Geodynamics" being attached. The 2016 Symposium addressed a wide range of scientific problems in geodynamical research and chose the interactions of geophysical fluids with Earth tidal phenomena and observations as a specific focus (Braitenberg et al, 2018).…”

Section: Investigations Of Tidal Phenomenamentioning

confidence: 99%

Geodesy and Cartography

Bogusz

Brzeziński

Nastula

2019

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This paper summarizes the activity of the chosen Polish geodetic research teams in 2015-2018 in the fields of Earth: rotation, dynamics as well as magnetic field. It has been prepared for the needs of the presentation on the 27 th International Union of Geodesy and Geodynamics General Assembly, Montreal, Canada. The part concerning Earth rotation is mostly focused on the use of modelling of diurnal and subdiurnal components of Earth rotation by including low frequency components of polar motion and UT1 in the analysis, study of free oscillations in Earth rotation derived from both space-geodetic observations of polar motion and the time variation of the second degree gravitational field coefficients derived from Satellite Laser Ranging (SLR) and Gravity Recovery and Climate Experiment (GRACE) observations, new methods of monitoring of Earth rotation, as well as studies on applications of the Ring Laser Gyroscope (RLG) for direct and continuous measurements of changes in Earth rotation and investigations of the hydrological excitation of polar motion. Much attention was devoted to the GRACE-derived gravity for explaining the influence of surface mass redistributions on polar motion. Monitoring of the geodynamical phenomena is divided into study on local and regional dynamics using permanent observations, investigation on tidal phenomena, as well as research on hydrological processes and sea level variation parts. Finally, the recent research conducted by Polish scientists on the Earth's magnetic field is described.

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Section: Investigations Of Tidal Phenomenamentioning

confidence: 99%

Geodesy and Cartography

Bogusz

Brzeziński

Nastula

2019

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“…However, prior to using tiltmeter corrections, the attraction part of the observed tilt should be removed as ring lasers are sensitive only to the geometrical part (Schreiber and Wells 2013). Additionally, any instrument, also a tiltmeter, has its own instrumental noises or offsets (more details on the influence of diurnal and subdiurnal signals in the normal vector about tiltmeter observations and their sensitivity to the phenomena discussed in this paper can be found in the PAGEOPH Topical volume Braitenberg et al (2018) as for instance Ruotsalainen (2018), Grillo et al (2018) and Rossi et al (2018)). Therefore, we decided to verify how the local phenomena, solid Earth tides, ocean tidal loading and non-tidal atmospheric pressure and continental water storage loading, reflect themselves in the observed Sagnac frequency and compare the modeled signal with the one observed by a tiltmeter.…”

Section: Introductionmentioning

confidence: 99%

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

Tercjak

Gebauer

Rajner

et al. 2020

Pure Appl. Geophys.

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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.

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“…In addition, the in situ hydrological and gravity data are essential for correcting the other geodetic observations of the observatory for hydrological effects so that they may be more suitable for studying other geophysical processes such as those mentioned above, and for the evaluation of satellite gravity observations by GRACE and GRACE-Follow On missions using ground-based monitoring (e.g. Crossley et al, 2014;Van Camp et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Hydrometeorological and gravity signals at the Argentine-German Geodetic Observatory (AGGO) in La Plata

Mikolaj

Güntner

Brunini

et al. 2019

Earth Syst. Sci. Data

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The Argentine-German Geodetic Observatory (AGGO) is one of the very few sites in the Southern Hemisphere equipped with comprehensive cutting-edge geodetic instrumentation. The employed observation techniques are used for a wide range of geophysical applications. The data set provides gravity time series and selected gravity models together with the hydrometeorological monitoring data of the observatory. These parameters are of great interest to the scientific community, e.g. for achieving accurate realization of terrestrial and celestial reference frames. Moreover, the availability of the hydrometeorological products is beneficial to inhabitants of the region as they allow for monitoring of environmental changes and natural hazards including extreme events. The hydrological data set is composed of time series of groundwater level, modelled and observed soil moisture content, soil temperature, and physical soil properties and aquifer properties. The meteorological time series include air temperature, humidity, pressure, wind speed, solar radiation, precipitation, and derived reference evapotranspiration. These data products are extended by gravity models of hydrological, oceanic, La Plata estuary, and atmospheric effects. The quality of the provided meteorological time series is tested via comparison to the two closest WMO (World Meteorological Organization) sites where data are available only in an inferior temporal resolution. The hydrological series are validated by comparing the respective forward-modelled gravity effects to independent gravity observations reduced up to a signal corresponding to local water storage variation. Most of the time series cover the time span between April 2016 and November 2018 with either no or only few missing data points. The data set is available at https://doi.

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Geodynamics and Earth Tides Observations from Global to Micro Scale: Introduction

Cited by 6 publications

References 30 publications

Geodesy and Cartography

Geodesy and Cartography

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

Hydrometeorological and gravity signals at the Argentine-German Geodetic Observatory (AGGO) in La Plata

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