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Titolo:
Atmospheric excitation of the Chandler wobble, 1983-1998
Autore:
Aoyama, Y; Naito, I;
Indirizzi:
Natl Astron Observ, Div Earth Rotat, Mizusawa, Iwate 0230861, Japan Natl Astron Observ Mizusawa Iwate Japan 0230861 awa, Iwate 0230861, Japan Grad Univ Adv Studies, Sch Math & Phys Sci, Dept Astron Sci, Mizusawa, Japan Grad Univ Adv Studies Mizusawa Japan , Dept Astron Sci, Mizusawa, Japan
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B5, volume: 106, anno: 2001,
pagine: 8941 - 8954
SICI:
0148-0227(20010510)106:B5<8941:AEOTCW>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
EARTHS POLAR MOTION; ANGULAR-MOMENTUM; METEOROLOGICAL EXCITATION; GRAVITATIONAL-FIELD; SEASONAL-VARIATIONS; WIND; ROTATION; MODEL; VARIABILITY; CIRCULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Aoyama, Y Kyoto Univ, Radio Sci Ctr Space & Atmosphere, Gokasho, Uji, Kyoto 6110011,Japan Kyoto Univ Gokasho Uji Kyoto Japan 6110011 , Kyoto 6110011,Japan
Citazione:
Y. Aoyama e I. Naito, "Atmospheric excitation of the Chandler wobble, 1983-1998", J GEO R-SOL, 106(B5), 2001, pp. 8941-8954

Abstract

The excitation of the Chandler wobble (CW) by atmospheric wind and pressure variations is studied for the period 1983-1998. The data used here are the atmospheric angular momentum (AAM) functions computed from the operational objective analysis data of the Japan Meteorological Agency, compared with. observed Earth wobble data. In the vicinity of the Chandler frequency (0.847 cycle per year), the AAM function has a broad spectral peak with somewhat excessive power and about 30 degrees phase lead to that inferred from the observed wobble, with a coherence exceeding 95% confidence threshold. In addition, the temporal variation in the CW excitation calculated from the shifted 8-year data of the AAM function is found to have nearly the same pattern as that inferred from observation, in which the wind and inverted barometer (IB) pressure contributions complement each other. They reveal that the atmospheric wind and IB pressure variations by themselves maintain a major part of the observed CW during the analysis period.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 03:17:59