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2018 | OriginalPaper | Buchkapitel

Detection of the Atmospheric S1Tide in VLBI Polar Motion Time Series

verfasst von : Anastasiia Girdiuk, Michael Schindelegger, Matthias Madzak, Johannes Böhm

Erschienen in: International Symposium on Earth and Environmental Sciences for Future Generations

Verlag: Springer International Publishing

Abstract

The contribution of the diurnal atmospheric S1 tide to Earth’s wobble is assessed by tidally analyzing hourly polar motion (PM) estimates from approximately 25 years of geodetic Very Long Baseline Interferometry (VLBI) observations. Special emphasis is placed on the dependency of S1 estimates on various settings in the a priori delay model and on the method of time series analysis in post-processing. The considered VLBI solutions differ with regard to the inclusion/exclusion of weak network geometries and the choice of a priori geophysical corrections such as thermal antenna deformation. Prograde PM coefficients \(\text{A}^{+} + i\text{B}^{+}\) of S1 are on the level of 9 + i10 μas (microarcseconds) for all solutions and none of the changes in the processing strategies perturbs this estimate beyond the twofold S1 standard deviation (\(\sim\) 2.6 μas). An independent validation of the deduced harmonics against excitation estimates from atmosphere-ocean models shows that space geodetic and geophysical accounts of the S1 effect in PM are still inconsistent by about 10 μas.

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Metadaten
Titel
Detection of the Atmospheric S1Tide in VLBI Polar Motion Time Series
verfasst von
Anastasiia Girdiuk
Michael Schindelegger
Matthias Madzak
Johannes Böhm
Copyright-Jahr
2018
Verlag
Springer International Publishing
DOI
https://doi.org/10.1007/1345_2016_234