Seasonal oscillations in length-of-day: Paper presented at the XXI General Assembly European Geophysical Society The Hague, The Netherlands 6-10 May, 1996
Variations of annual and semiannual oscillations in rotation parameters have been investigated on the basis of length-of-day (LOD) as well as atmospheric-angular-momemtum (AAM) time series. These oscillations were deter- mined using band-pass filters. In order to show the character of variations of seasonal oscillations, amplitudes, phases and periods were computed by a least-squares adjustment with the method of modified harmonic analysis at quarterly intervals. In addition, the seasonal imbalances in LOD and AAM budgets were determined and analysed in a similar way. These discrepancies were... Mehr ...
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| Dokumenttyp: | report |
| Erscheinungsdatum: | 1996 |
| Verlag/Hrsg.: |
GeoForschungsZentrum GFZ
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| Sprache: | Englisch |
| Permalink: | https://search.fid-benelux.de/Record/base-29591607 |
| Datenquelle: | BASE; Originalkatalog |
| Powered By: | BASE |
| Link(s) : | https://gfzpublic.gfz-potsdam.de/pubman/item/item_8430 |
Variations of annual and semiannual oscillations in rotation parameters have been investigated on the basis of length-of-day (LOD) as well as atmospheric-angular-momemtum (AAM) time series. These oscillations were deter- mined using band-pass filters. In order to show the character of variations of seasonal oscillations, amplitudes, phases and periods were computed by a least-squares adjustment with the method of modified harmonic analysis at quarterly intervals. In addition, the seasonal imbalances in LOD and AAM budgets were determined and analysed in a similar way. These discrepancies were corrected for tidally excited effects. The non-atmospheric oscillations without the annual tide effect Sa and the semiannual tide effect Ssa have changeable amplitudes between 0.02 and 0.10 ms.