Low-frequency variations, Chandler and annual wobbles of polar motion as 
observed over one century

Höpfner, Joachim

doi:10.48440/GFZ.b103-030076

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Low-frequency variations, Chandler and annual wobbles of polar motion as observed over one century

Urheber*innen

Höpfner, Joachim
Scientific Technical Report STR, Deutsches GeoForschungsZentrum;
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Gravity Field and Gravimetry -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Zitation

Höpfner, J. (2003): Low-frequency variations, Chandler and annual wobbles of polar motion as observed over one century, (Scientific Technical Report STR ; 03/01), Potsdam : Deutsches GeoForschungsZentrum GFZ, 41 p.
https://doi.org/10.48440/GFZ.b103-030076

Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_8596

Zusammenfassung

Polar motion data is available from the mid-19th century to the present. Based on time series with a variety of sampling intervals (monthly, 0.05-year, 5-day and daily), we have separated the low-frequency terms by low-pass filtering and the Chandler and annual terms by recursive band-pass filtering of the pole coordinates. Using a simple unweighted least-squares fit to the filtered low-frequency terms, the linear trends of the rotation pole were estimated. Assessing the estimates based on intercomparisons, the most reliable trend estimate was found. Using a Fast Fourier Transform, we have computed the prograde, retrograde and total amplitude spectra of the low-frequency part of polar motion in order to reveal the long-periodic signals. The characteristics and time evolution of the Chandler and annual wobbles are described by changes in their parameters (radii, directions and period lengths) over one century.