Analysis of non-tidal ocean loading for gravitational potential observations in northern Europe

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OriginalspracheEnglisch
Seiten (von - bis)23-28
Seitenumfang6
FachzeitschriftJournal of geodynamics
Jahrgang119
PublikationsstatusVeröffentlicht - 29 Mai 2018

Abstract

With the progress in clock technology heading towards a relative clock accuracy of 10−18, geodetic applications become feasible, such as determining gravity potential differences over large distances at the level of 0.1 m2 s−2. In this context, the effect of temporal gravity field variations on the new observable has to be considered. This paper studies non-tidal ocean loading effects on the gravitational potential around the North Sea with respect to signal strength and temporal behavior. Ten years of gravitational potential variations caused by non-tidal ocean loading are calculated for five locations in Germany and France using the Green's function approach. The potential variations are discussed with respect to a static gravity field, the effect of different measurement durations and the differences between two locations. The gravitational potential variations reach values of 0.2–0.5 m2 s−2 in coastal areas and decrease with increasing distance from the coast. Analyzing the potential variations for increasing measurement durations from 1 h to 48 h shows a decrease in magnitude. All investigated locations are strongly correlated. They differ mostly due to different magnitudes of the gravitational potential variations.

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Analysis of non-tidal ocean loading for gravitational potential observations in northern Europe. / Leßmann, L.; Müller, J.
in: Journal of geodynamics, Jahrgang 119, 29.05.2018, S. 23-28.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

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abstract = "With the progress in clock technology heading towards a relative clock accuracy of 10−18, geodetic applications become feasible, such as determining gravity potential differences over large distances at the level of 0.1 m2 s−2. In this context, the effect of temporal gravity field variations on the new observable has to be considered. This paper studies non-tidal ocean loading effects on the gravitational potential around the North Sea with respect to signal strength and temporal behavior. Ten years of gravitational potential variations caused by non-tidal ocean loading are calculated for five locations in Germany and France using the Green's function approach. The potential variations are discussed with respect to a static gravity field, the effect of different measurement durations and the differences between two locations. The gravitational potential variations reach values of 0.2–0.5 m2 s−2 in coastal areas and decrease with increasing distance from the coast. Analyzing the potential variations for increasing measurement durations from 1 h to 48 h shows a decrease in magnitude. All investigated locations are strongly correlated. They differ mostly due to different magnitudes of the gravitational potential variations.",
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author = "L. Le{\ss}mann and J. M{\"u}ller",
note = "Funding information: The authors would like to thank the DFG Collaborative Research Center CRC-1128 Relativistic Geodesy and Gravimetry with Quantum Sensors (geo-Q) for financial support. We want to thank the reviewer for the valuable comments.",
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AU - Leßmann, L.

AU - Müller, J.

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N2 - With the progress in clock technology heading towards a relative clock accuracy of 10−18, geodetic applications become feasible, such as determining gravity potential differences over large distances at the level of 0.1 m2 s−2. In this context, the effect of temporal gravity field variations on the new observable has to be considered. This paper studies non-tidal ocean loading effects on the gravitational potential around the North Sea with respect to signal strength and temporal behavior. Ten years of gravitational potential variations caused by non-tidal ocean loading are calculated for five locations in Germany and France using the Green's function approach. The potential variations are discussed with respect to a static gravity field, the effect of different measurement durations and the differences between two locations. The gravitational potential variations reach values of 0.2–0.5 m2 s−2 in coastal areas and decrease with increasing distance from the coast. Analyzing the potential variations for increasing measurement durations from 1 h to 48 h shows a decrease in magnitude. All investigated locations are strongly correlated. They differ mostly due to different magnitudes of the gravitational potential variations.

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KW - Non-tidal ocean loading

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KW - Relativistic geodesy

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