Signatur:
21/STR 03/01
In:
Scientific technical report
Beschreibung / Inhaltsverzeichnis:
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.
Materialart:
GFZ-Veröffentlichungen
Seiten:
51 S.
Serie:
Scientific technical report / Geoforschungszentrum Potsdam 03/01
URL:
http://ebooks.gfz-potsdam.de/pubman/item/escidoc:8596:2/component/escidoc:8595/0301.pdf
Klassifikation:
Geodynamik
Sprache:
Englisch
Standort:
Lesesaal
Zweigbibliothek:
GFZ Bibliothek
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