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Titolo: Indirect effect of the atmosphere through the oceans on the Earth nutationusing the torque approach
Autore: de Viron, O; Ponte, RM; Dehant, V;
 Indirizzi:
 Atmospher & Environm Res Inc, Cambridge, MA 02139 USA Atmospher & EnvironmRes Inc Cambridge MA USA 02139 mbridge, MA 02139 USA Royal Observ Belgium, B1180 Brussels, Belgium Royal Observ Belgium Brussels Belgium B1180 m, B1180 Brussels, Belgium CALTECH, Jet Prop Lab, Pasadena, CA USA CALTECH Pasadena CA USACALTECH, Jet Prop Lab, Pasadena, CA USA
 Titolo Testata:
 JOURNAL OF GEOPHYSICAL RESEARCHSOLID EARTH
fascicolo: B5,
volume: 106,
anno: 2001,
pagine: 8841  8851
 SICI:
 01480227(20010510)106:B5<8841:IEOTAT>2.0.ZU;2O
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 ANGULARMOMENTUM; BAROTROPIC MOTIONS; POLAR MOTION; PRESSURE; PRECESSION; ROTATION;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 Citazioni:
 16
 Recensione:
 Indirizzi per estratti:
 Indirizzo: de Viron, O Royal Observ Belgium, Ave Circulaire 3, B1180 Brussels, Belgium Royal Observ Belgium Ave Circulaire 3 Brussels Belgium B1180



 Citazione:
 O. de Viron et al., "Indirect effect of the atmosphere through the oceans on the Earth nutationusing the torque approach", J GEO RSOL, 106(B5), 2001, pp. 88418851
Abstract
The atmosphere exerts a direct torque on the Earth, perturbing its rotation. Additionally, the atmosphere exerts pressure, gravitational, and friction forces on the ocean, which induce an indirect effect of the atmosphere onthe Earth. The oceanic response consists of variable currents and mass fluxes. These effects change the oceanic torque on the Earth. As the atmosphere has a large diurnal cycle, the indirect torque also presents a large diurnal component. This indirect diurnal torque is investigated using a numerical barotropic ocean model. In particular, we show that a dynamic ocean model is essential to compute the indirect effect of the atmosphere on nutation, as the oceanic response is far from that predicted by a static model. We also point out that the response of the ocean is nevertheless highly correlated with the atmospheric signal for the diurnal timescale but with a largeamplification. The amount of ocean bottom friction is found to have a substantial influence on the indirect diurnal torque acting on the Earth. The effect of this indirect torque on the Earth nutation is computed and found to be much larger than the precision of current nutation observations, but results are uncertain in light of discrepancies in the angular momentum and torque balance.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/01/20 alle ore 07:26:07