Comparison of two wavelet transform coherence and cross-covariance functions applied on polar motion and atmospheric excitation.

Autor:	Popiński, Waldemar
Další autoři:	Kosek, Wieslaw Schuh, Harald Schmidt, Michael
Jazyk:	angličtina
Předmět:	geofyzika geodézie zemská rotace geophysics geodesy Earth rotation články journal articles atmospheric angular momentum spectro-temporal analysis time lags
Druh dokumentu:	Non-fiction
ISSN:	0039-3169
Abstrakt:	Abstract: The wavelet transform techniques were applied to compute time-frequency spectra, coherence and cross-covariance functions between complex-valued polar motion and atmospheric excitation functions. These wavelet transform approaches are based on the classical wavelet transform with Morlet wavelet and the harmonic wavelet transform. The computed coherence and cross-covariance functions enable comparison of polar motion and atmospheric excitation functions data in the chosen frequency band. In the study we concentrate on short period oscillations with periods ranging from several to about 250 days. The time lag functions show frequency dependent time lags corresponding to maxima of the modules of cross-covariance functions between the polar motion and atmospheric excitation functions.
Databáze:	Katalog Knihovny AV ČR
Externí odkaz:	Online Access Full text from SpringerLink