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Oceanic and atmospheric excitation of the Chandler wobble
Liao, DC; Liao, XH; Zhou, YH
2003
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
Volume152Issue:1Pages:215-227
AbstractThe excitation mechanism of the Chandler wobble (CW) is investigated by examining the power spectra of oceanic angular momentum (OAM) excitation (1985-1995) and two series of atmospheric angular momentum (AAM) excitation. The power spectra are then compared with those of the observed excitation derived from the polar motion of COMB2000 series for different periods of time. The results show that the excitation from OAM can provide approximately 64 per cent of the required energy of the observed CW excitation, while the energy from AAM excitation is comparable with that of the observed CW excitation sometimes, but it is far less than that of the observed one at other times. The multitaper coherence analysis method is also used to investigate the relationship between the observed CW excitation and the geophysical excitation derived from OAM and AAM in the frequency domain. The results show that there is a high coherence (0.52) between the OAM excitation and the observed one during 1985-1995, while large fluctuations of the coherence and linear trend of the coherent phases exist between the AAM excitation and the observed one during 1962-2000. Some analyses are also made concerning the effects of different CW periods and quality factor (Q) on the CW excitation.
KeywordAtmospheric Angular Momentum Chandler Wobble Excitation Mechanism Oceanic Angular Momentum Polar Motion
Indexed BySCI
Language英语
WOS IDWOS:000179750600015
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8445
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Liao, DC,Liao, XH,Zhou, YH. Oceanic and atmospheric excitation of the Chandler wobble[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2003,152(1):215-227.
APA Liao, DC,Liao, XH,&Zhou, YH.(2003).Oceanic and atmospheric excitation of the Chandler wobble.GEOPHYSICAL JOURNAL INTERNATIONAL,152(1),215-227.
MLA Liao, DC,et al."Oceanic and atmospheric excitation of the Chandler wobble".GEOPHYSICAL JOURNAL INTERNATIONAL 152.1(2003):215-227.
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