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Titel |
Short term geophysical excitation of the polar motion |
VerfasserIn |
C. Bizouard, L. Seoane, D. Gambis |
Konferenz |
EGU General Assembly 2009
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 11 (2009) |
Datensatznummer |
250021647
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Zusammenfassung |
That study is devoted to the interpretation of the short term polar motion (periods
ranging from 2 to 20 days). Whereas it represents less than 0.2% of the total polar
motion amplitude, its variations are not less interesting than the seasonal ones, but are
more difficult to determine and to interpret. According to the common view, they
reflect weekly changes in the mass redistribution of the atmosphere and oceans. That
interpretation is revisited by comparing the later up to date atmospheric and oceanic angular
momentum series to the excitation found in various polar motion series. Global
comparison is very satisfactory. In particular, effect of the normal atmospheric mode Ψ11
(10 days) is striking and the tidal oscillation in polar motion at 13.6 days is partly
harmonic : it presents variation in amplitude and phase because of the geophysical
fluid influence. Finally we show the degradation of pole coordinates determination
for periods approaching the Nyquist period of 2 days in the routine pole series. |
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