2016
DOI: 10.1007/s00190-016-0919-4
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High-frequency Earth rotation variations deduced from altimetry-based ocean tides

Abstract: A model of diurnal and semi-diurnal variations in Earth rotation parameters (ERP) is constructed based on altimetry-measured tidal heights from a multi-mission empirical ocean tide solution. Barotropic currents contributing to relative angular momentum changes are estimated for nine major tides in a global inversion algorithm that solves the two-dimensional momentum equations on a regular 0.5 • grid with a heavily weighted continuity constraint. The influence of 19 minor tides is accounted for by linear admitt… Show more

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Cited by 13 publications
(13 citation statements)
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“…Signals with periods of 1, 1/2, and 1/3 years are estimated to account for any mis-modelled seasonal signals particularly related to the global mass balance (Yan and Chao, 2012) from a (moving) base-window of four years. An additional term with a period of 13.7 days is required to account for a prominent periodicity in C04 that is likely related to aliasing of sub-daily tide model errors (Madzak et al, 2016).…”
Section: Prediction Of Earth Rotation Parametersmentioning
confidence: 99%
“…Signals with periods of 1, 1/2, and 1/3 years are estimated to account for any mis-modelled seasonal signals particularly related to the global mass balance (Yan and Chao, 2012) from a (moving) base-window of four years. An additional term with a period of 13.7 days is required to account for a prominent periodicity in C04 that is likely related to aliasing of sub-daily tide model errors (Madzak et al, 2016).…”
Section: Prediction Of Earth Rotation Parametersmentioning
confidence: 99%
“…In PM however, all tidal signals with periods above 1 day remain in the time series due to the lack of readily available correction models. Furthermore, all applied tidal models are not free from errors Madzak et al (2016). Sub-daily tidal variations and further systematic effects with periodic behavior have been also identified in recent EOP estimates obtained by the International GNSS Service (IGS; Ray et al, 2017).…”
Section: Comparison Of Geodetic and Geophysical Excitationsmentioning
confidence: 78%
“…Recent progress toward an updated model of subdaily Earth rotation variations [Desai and Sibois, 2016;Madzak et al, 2016] has been complemented in this paper by a multimodel based account of the thermal S 1 component in LOD. A priori consideration of the effect reduces space geodetic positioning errors by up to 1 mm, as diurnal peak-to-peak amplitudes in ΔΛ (12 μs) translate to an angle of 30 μas at the Earth's surface.…”
Section: Summary Remarksmentioning
confidence: 99%
“…Ocean tide contributions at diurnal and semidiurnal frequencies have received particular attention, both for their relevance in studying Earth librations [ Chao et al , ] and to meet the need of space geodesy for precise rotation predictions. A priori knowledge of the major ocean tidal effects has been in hand for at least two decades [ Chao et al , ] and continues to be refined [e.g., Madzak et al , ], given the increasingly tight accuracy requirements (≤1 mm) for the deliverables of space geodesy [ Griffiths and Ray , ]. In keeping with this development, explanations must be put forth for remaining discrepancies in the budget of short period Earth rotation variations.…”
Section: Introductionmentioning
confidence: 99%