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Titolo:
THE OCEANIC CONTRIBUTION TO THE EARTHS SEASONAL ANGULAR-MOMENTUM BUDGET
Autore:
DICKEY JO; MARCUS SL; JOHNS CM; HIDE R; THOMPSON SR;
Indirizzi:
JET PROP LAB,SPACE GEODET SCI & APPLICAT GRP PASADENA CA 91109 NERC,CLARENDON LAB,OCEANOG UNIT OXFORD OX1 3PU ENGLAND NERC,INST OCEANOG SCI,DEACON LAB WORMLEY GU8 5UB SURREY ENGLAND
Titolo Testata:
Geophysical research letters
fascicolo: 24, volume: 20, anno: 1993,
pagine: 2953 - 2956
SICI:
0094-8276(1993)20:24<2953:TOCTTE>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTARCTIC CIRCUMPOLAR CURRENT; TRANSPORT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
13
Recensione:
Indirizzi per estratti:
Citazione:
J.O. Dickey et al., "THE OCEANIC CONTRIBUTION TO THE EARTHS SEASONAL ANGULAR-MOMENTUM BUDGET", Geophysical research letters, 20(24), 1993, pp. 2953-2956

Abstract

Seasonal variations in the speed of the Earth's rotation manifest themselves as fluctuations in the length of the day (LOD) with an amplitude of about 1000 microseconds (mus). We know from previous work that at least 95% of these variations can be accounted for in terms of angular momentum exchanged between the atmosphere and the solid Earth. Herewe examine the respective contributions of the Antarctic Circumpolar Current (ACC) and the global oceans to the Earth's seasonal angular momentum budget, using in situ data from the Drake Passage and results from both the oceanic regional model (Fine Resolution Antarctic Model-FRAM) of Webb et al. [1991] and the global oceanic model of Maier-Reimer et al. [1993] as analyzed by Brosche et al. [1990]. The estimated annual contribution of the ACC (2-4 mus) is much smaller than the total variation in the oceanic models or the existing LOD-AAM residual (bothapproximately 15-20 mus). The estimated semi-annual ACC contribution (3-8 mus) is offset by counter-currents further north in both oceanic models, which exhibit larger semi-annual variations in planetary angular momentum. Further refinements in the Earth's seasonal angular momentum budget, therefore, will require the full (planetary plus relative)contribution of the global oceans in addition to that of the ACC.

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Documento generato il 08/04/20 alle ore 23:26:18