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• W2786038565 abstract "The polar motion consists of free and forced oscillations which are influenced by mass variations in the Earth system. The contribution of the atmosphere to the excitation of the polar motion is investigated by forcing the dynamic Earth system model DyMEG with atmospheric angular momentum (AAM) and by multivariate statistical analyses of the regional representation of the AAM. The analyses are performed with the ECHAM3-T21 and the ECHAM4-T42 global circlation models, which are only forced by observed sea surface temperatures. For validation, the NCEP-reanalysis is used. The model results of DyMEG show, that the annual oscillation of polar motion is predominantly due to atmospheric pressure forcing, while the motion component is less important. A regional statistical analysis of the AAM due to mass variations presents an anomaly pattern which consists of strong annual pressure variations located over Asia, in particular at the Himalaya. This annual atmospheric pushing and pulling on the Earth above the Asian continent turns out to be the primary component responsible for accelerating the forced polar motion. These pressure variations are also active on higher frequencies connected with rapid polar motions. The results reveals, that atmospheric forcing is sufficient to excite the Chandler wobble (CW). Neither a significant nor at least an increased signal in the frequency domain of 14 to 16 months exists and regional statistical analysis of AAM give no hint for an oscillation with a typical time scale of 14 to 16 months. Hence, the CW seems to be excited by stochastic processes in the atmosphere." @default.
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• W2786038565 date "2005-01-01" @default.
• W2786038565 modified "2023-09-27" @default.
• W2786038565 title "Atmospheric forcing mechanisms of polar motion" @default.
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