Reconstruction of prograde and retrograde Chandler excitation
-
Leonid V. Zotov
and
Christian Bizouard
Abstract
Observed polar motion consists of uniform circular motions at both positive (prograde) and negative (retrograde) frequencies. Generalized Euler–Liouville equations of Bizouard, taking into account Earth's triaxiality and asymmetry of the ocean tide, show that the corresponding retrograde and prograde circular excitations are coupled at any frequency. In this work, we reconstructed the polar motion excitation in the Chandler band (prograde and retrograde). Then we compared it with geophysical excitation, filtered out in the same way from the series of the Oceanic Angular Momentum (OAM) and Atmospheric Angular Momentum (AAM) for the period 1960–2000. The agreement was found to be better in the prograde band than in the retrograde one.
Funding source: RFBI
Award Identifier / Grant number: 12-02-31184
The first author is indebted to Paris Observatory for supporting this work (two month position).
© 2016 by De Gruyter
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Articles in the same Issue
- Frontmatter
- Preface
- Lq-regularization for the inverse Robin problem
- Hybrid Newton-type methods for reconstructing sound-soft obstacles from a single far field
- Numerical simulation and parameters inversion for non-symmetric two-sided fractional advection-dispersion equations
- A coupled model of partial differential equations for uranium ores heap leaching and its parameters identification
- An optimal filtering method for a time-fractional inverse advection-dispersion problem
- Simultaneous determination of thickness, thermal conductivity and porosity in textile material design
- Nuclear norm and indicator function model for matrix completion
- Calibrating the model parameters in pricing using the trust region method
- An adaptive multigrid conjugate gradient method for permeability identification of nonlinear diffusion equation
- Reconstruction of prograde and retrograde Chandler excitation
