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Detection of the Atmospheric S1Tide in VLBI Polar Motion Time Series

  • Anastasiia Girdiuk
  • Michael Schindelegger
  • Matthias Madzak
  • Johannes Böhm
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 147)

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.

Keywords

Atmospheric tides High-frequency Earth rotation Single session time series approach VLBI 

Notes

Acknowledgements

We kindly thank John Gipson for providing his tidal estimates, and we also appreciate the recommendations from three anonymous reviewers. Financial support for this study was made available by the Austrian Science Fund (FWF) under project ASPIRE (I1479-N29).

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Anastasiia Girdiuk
    • 1
  • Michael Schindelegger
    • 1
  • Matthias Madzak
    • 1
  • Johannes Böhm
    • 1
  1. 1.Department of Geodesy and GeoinformationTU WienViennaAustria

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