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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, B-1180 Brussels, Belgium Royal Observ Belgium Brussels Belgium B-1180 m, B-1180 Brussels, Belgium CALTECH, Jet Prop Lab, Pasadena, CA USA CALTECH Pasadena CA USACALTECH, Jet Prop Lab, Pasadena, CA USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B5, volume: 106, anno: 2001,
pagine: 8841 - 8851
SICI:
0148-0227(20010510)106:B5<8841:IEOTAT>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANGULAR-MOMENTUM; 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, B-1180 Brussels, Belgium Royal Observ Belgium Ave Circulaire 3 Brussels Belgium B-1180
Citazione:
O. de Viron et al., "Indirect effect of the atmosphere through the oceans on the Earth nutationusing the torque approach", J GEO R-SOL, 106(B5), 2001, pp. 8841-8851

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.

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Documento generato il 27/01/20 alle ore 07:26:07