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Atmospheric excitation of polar motion

Geo-Spatial Information Science, 2010
The polar motion excited by the fluctuation of global atmospheric angular momentum (AAM) is investigated. Based on the global AAM data, numerical results demonstrate that the fluctuation of AAM can excite the seasonal wobbles (e.g., the 18-month wobble) and the Chandler wobble, which agree well with previous studies.
Wei Chen, Wenbin Shen
exaly   +2 more sources

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Seasonal excitation of polar motion

Journal of Geodynamics, 2012
We estimate geophysical excitations (chi(1) and chi(2)) of polar motion using multiple sources of data, including recent atmospheric, oceanic, and hydrological models, satellite gravity measurements from the Gravity Recovery and Climate Experiment (GRACE), and compare geophysical excitations with observed polar motion excitations from space geodetic ...
Jianli Chen, C R Wilson
exaly   +4 more sources

Excitation of annual polar motion by atmosphere and ocean

Science Bulletin, 2000
The quantitative result of annual polar motion excitation by the ocean is presented for the first time. The atmospheric excitation amounts to more than double of the oceanic excitation. The sum of atmospheric and oceanic excitations approximates more to the observed annual polar motion excitation, compared with atmospheric excitation only.
Yonghong Zhou, Dawei Zheng, Zhou Yonghong   +2 more
exaly   +2 more sources

Oceanic excitation of polar motion: Identification of specific oceanic areas important for polar motion excitation

Journal of Geodynamics, 2012
Abstract In this paper regional values of the oceanic excitation function of polar motion are computed from bottom pressure and oceanic current fields from the ECCO/JPL data-assimilating model kf080 for the period 1993–2009. The influence of different geographic regions of the ocean on the excitation of polar motion is determined by calculating ...
Jolanta Nastula, Richard Gros, David A Salstein   +2 more
exaly   +2 more sources

Atmospheric excitation of nonseasonal polar motion

Journal of Geophysical Research: Solid Earth, 1993
Analysis of nonseasonal polar motion excitation and atmospheric mass equatorial angular momentum (EAM) over land for the period 1980–1989 reveals a clear pattern of high power and correlation during the northern hemisphere (NH) winter followed by low power and correlation during the NH summer.
John Kuehne, Stuart Johnson, Clark R. Wilson   +2 more
openaire   +1 more source

Modeling and forecast of the polar motion excitation functions for short-term polar motion prediction

Journal of Geodesy, 2004
Short-term forecast of the polar motion is considered by introducing a prediction model for the excitation function that drives the polar motion dynamics. The excitation function model consists of a slowly varying trend, periodic modes with annual and several sub-annual frequencies (down to the 13.6-day fortnightly tidal period), and a transient decay ...
T.M. Chin, R.S. Gross, J.O. Dickey
exaly   +2 more sources