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Titolo:
Numerical experiments on the movement of a warm-core ring with the bottom slope of a western boundary
Autore:
Itoh, S; Sugimoto, T;
Indirizzi:
Univ Tokyo, Ocean Res Inst, Div Fisheries Environm Oceanog, Nakano Ku, Tokyo, Japan Univ Tokyo Tokyo Japan heries Environm Oceanog, Nakano Ku, Tokyo, Japan
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C11, volume: 106, anno: 2001,
pagine: 26851 - 26862
SICI:
0148-0227(20011115)106:C11<26851:NEOTMO>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
BETA-PLANE; EDDIES; VORTICES; TOPOGRAPHY; GENERATION; EVOLUTION; KUROSHIO; MOTION; LENSES; VORTEX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Itoh, S Univ Tokyo, Ocean Res Inst, Div Fisheries Environm Oceanog, NakanoKu, 1-15-1 Minamidai, Tokyo, Japan Univ Tokyo 1-15-1 Minamidai Tokyo Japan Minamidai, Tokyo, Japan
Citazione:
S. Itoh e T. Sugimoto, "Numerical experiments on the movement of a warm-core ring with the bottom slope of a western boundary", J GEO RES-O, 106(C11), 2001, pp. 26851-26862

Abstract

Numerical experiments are performed to investigate the effects of the bottom slope of a western boundary on realistic warm-core rings, using a primitive equation sigma coordinate model. Warm-core rings which initially have baroclinic velocity near a steep bottom slope gradually move northward, but those with barotropic velocity do not. Barotropic velocity on the slope immediately disperses as a topographic Rossby wave, while baroclinic velocity is retained. Since the northward movement is caused by an effect very much like the image effect which is originally the effect of a free-slip wall, the authors term this effect the equivalent image effect. The equivalent image effect increases as a slope becomes steeper and bottom friction becomes weaker, and vice versa. It seems that a steep slope acts like a wall, and the bottom friction of a steep slope corresponds to the lateral viscous effect of a wall. However, the effect of a slope on a warm-core ring is different from that of a wall in that ring-slope interactions take place at the lower part of the ring. Because the velocity of a warm-core ring is weak in deep layers, ring-slope interactions are moderate and the leakage of the interior fluid of a ring seen in ring-wall interactions is not apparent, whilethe viscous effect is weaker than that of a no-slip wall as well. These results are applied to the northward movement of Kuroshio warm-core rings andto warm eddies in the Gulf of Mexico.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 18:13:10