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Titolo: The effect of sloping boundaries on baroclinic instability in two related internally heated, rotating fluid systems
Autore: Bastin, ME; Read, PL;
 Indirizzi:
 Univ Edinburgh, Western Gen Hosp, Dept Med Phys, Edinburgh EH4 2XU, Midlothian, Scotland Univ Edinburgh Edinburgh Midlothian Scotland EH4 2XU Midlothian, Scotland Univ Oxford, Clarendon Lab, Subdept Atmospher Phys, Oxford OX1 3PU, England Univ Oxford Oxford England OX1 3PU mospher Phys, Oxford OX1 3PU, England
 Titolo Testata:
 PHYSICS AND CHEMISTRY OF THE EARTH PART BHYDROLOGY OCEANS AND ATMOSPHERE
fascicolo: 5,
volume: 24,
anno: 1999,
pagine: 481  486
 SICI:
 14641909(1999)24:5<481:TEOSBO>2.0.ZU;2D
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 GEOSTROPHIC TURBULENCE; NUMERICAL SIMULATIONS; ZONAL JETS; ANNULUS; WAVES; EDDIES; FLOWS;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 Citazioni:
 22
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Bastin, ME Univ Edinburgh, Western Gen Hosp, Dept Med Phys, Crewe Rd, Edinburgh EH4 2XU, Midlothian, Scotland Univ Edinburgh Crewe Rd Edinburgh Midlothian Scotland EH4 2XU d



 Citazione:
 M.E. Bastin e P.L. Read, "The effect of sloping boundaries on baroclinic instability in two related internally heated, rotating fluid systems", PHYS CH P B, 24(5), 1999, pp. 481486
Abstract
Results have been obtained from two internally heated, rotating fluid systems with differing aspect ratios, in which a betaeffect (variation in Coriolis parameter with latitude) has been simulated by the inclusion of oppositely sloping endwalls. The boundaries are arranged so that the fluid depth (D) can either increase with radius (partial derivative D/partial derivative r > 0) or decrease with radius (partial derivative D/partial derivative r< 0). In both systems, stable eddy features are observed over a wide rangeof rotation rates for each endwall arrangement. While a large number of different azimuthal wavenumber (m) modes are seen in the regular wave regime of the partial derivative D/partial derivative r > 0 endwall experiments, only the gravest mode (m = 1) is seen in the regular wave regime of the partial derivative D/partial derivative r < 0 endwall experiments. Within the former experimental arrangement, the radial scale of the eddy features is shown to be approximately that of the Rhines scale Lbeta = pi root 2U/beta, while in the partial derivative D/partial derivative r < 0 endwall experiments the eddy kinetic energy is seen to penetrate the Lbeta scale and accumulate at the largest domainfilling scales. This remarkable difference in the flow structure of the two endwall arrangements may find a partial explanation in terms of established results on the instability of finite amplitude barotropic Rossby waves, where partial derivative D/partial derivative r < 0 endwalls remove the stability thresholds on wave amplitudes for all butthe gravest mode. (C) 1999 Elsevier Science Ltd. All rights reserved.
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Documento generato il 01/10/20 alle ore 03:39:12