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Title of Journal: J Geod

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Abbravation: Journal of Geodesy

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Springer-Verlag

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DOI

10.1016/0006-3223(96)84171-0

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1432-1394

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Atmospheric and oceanic forcing of the rapid polar

Authors: Christian Bizouard L Seoane
Publish Date: 2009/09/03
Volume: 84, Issue: 1, Pages: 19-30
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Abstract

The rapid polar motion for periods below 20 days is revisited in light of the most recent and accurate geodetic and geophysical data Although its amplitude is smaller than 2 mas it is excited mostly by powerful atmospheric processes as large as the seasonal ones The residual amplitude representing about 20 of the total excitation stems from the oceans Rapid polar motion has an irregular nature that is well explained by the combined influence of the atmosphere and the oceans An overall spectrum reveals cycles principally at 20 136 fortnightly tidal period and 10 days corresponding to the normal atmospheric mode Psi 31 but this is only an averaged feature hiding its strong variability over seasonal time scales This explains why it is so delicate to determine an empirical model of the tidal effect on polar motion The variability in both amplitude and phase of the 136day term is probably caused by a lunar barometric effect modulated by some subseasonal thermal processes The irregularities of the prominent cycles of the shortterm polar motion are well explained by the atmospheric and oceanic excitations The oceanic variability reinforces the atmospheric one as they were triggered by the same agent maybe seasonal and interannual thermal variations

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