On the critical Richardson number in stably stratified turbulence

Atmospheric Science Letters - Tập 8 Số 3 - Trang 65-69 - 2007
Boris Galperin1, Semion Sukoriansky2, P. S. Anderson3
1College of Marine Science, University of South Florida, St. Petersburg, Florida, 33701, USA.
2Department of Mechanical Engineering/Perlstone Center for Aeronautical Engineering Studies, Ben‐Gurion University of the Negev, Beer‐Sheva 84105, Israel
3Antarctic Climate and the Earth System Programme, British Antarctic Survey, Cambridge CB3 0ET, UK

Tóm tắt

AbstractThe critical Richardson number, Ric, is used in studies of stably stratified turbulence as a measure of flow laminarization. The accepted range of Ric is between 0.2 and 1. A growing body of experimental and observational data indicates, however, that turbulence survives for Ri ≫ 1. This result is supported by a new spectral theory of turbulence that accounts for strong anisotropy and waves. The anisotropization results in the enhanced horizontal mixing of both momentum and scalar. Internal wave contribution preserves vertical momentum mixing above its molecular level. In the absence of laminarization, Ric becomes devoid of its conventional meaning. Copyright © 2007 Royal Meteorological Society

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Tài liệu tham khảo

10.1103/PhysRevLett.52.2352

10.1175/1525-7541(2002)003<0417:PSTOSA>2.0.CO;2

10.1175/1520-0485(1993)023<1363:VOTTAO>2.0.CO;2

10.1086/306427

10.1051/0004-6361:20011773

10.1046/j.1365-8711.2002.05962.x

10.1175/1520-0485(2001)031<1413:OTPIOP>2.0.CO;2

10.1098/rspa.1977.0142

10.1017/S0022112071000892

10.1086/170356

10.1038/nature01507

10.1017/S0022112061000317

10.1017/S0022112089002648

10.1023/B:SOLS.0000007947.51720.ed

10.1017/S0022112096008713

10.1103/PhysRevE.68.036308

10.1007/BF00118610

10.1007/978-1-4684-2322-8_9

Ligniéres F, 1999, Shear layer instability in a highly diffusive stably stratified atmosphere, Astronomy and Astrophysics, 349, 1027

LillyDK.The representation of small‐scale turbulence in numerical simulations experiments Proc. IBM Scientific Symp. on Envir. Science pp195–210 1967.

Maeder A, 1996, Diffusive mixing by shears in rotating stars, Astronomy and Astrophysics, 313, 140

10.1007/s001620050093

10.1007/s10546-005-9017-5

10.1017/S0022112098003085

10.1029/JC090iC01p00903

10.1051/0004-6361:20040279

10.1175/JAS3856.1

10.1029/2000JC000631

10.1175/1520-0469(1973)030<1061:APOTPO>2.0.CO;2

10.1029/RG020i004p00851

10.1017/S0022112089001126

10.1063/1.2361294

10.1017/S0022112061000305

Monin A, 1975, Statistical Fluid Mechanics: Mechanics of Turbulence

10.1175/1520-0469(2002)059<2513:OOFATI>2.0.CO;2

10.1175/1520-0485(1980)010<0083:EOTLRO>2.0.CO;2

10.1175/1520-0485(2004)034<0247:IDIN>2.0.CO;2

10.1006/icar.2001.6605

10.1007/s001620050041

Schatzman E, 2000, Shear turbulence beneath the solar tachocline, Astronomy and Astrophysics, 364, 876

10.1175/1520-0493(1963)091<0099:GCEWTP>2.3.CO;2

10.1017/S0022112096004557

10.1063/1.1383784

10.1175/1520-0485(2001)031<2026:VMATTA>2.0.CO;2

10.1063/1.2009010

10.5194/npg-13-9-2006

10.1017/S0022112064000672

10.1175/1520-0469(1978)035<1022:VTDIAS>2.0.CO;2

10.1016/S0377-0265(01)00068-9

10.5194/npg-13-185-2006

10.2151/jmsj1965.53.3_189

10.1029/2006JC003732

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Atmospheric Science Letters

Tập 8 Số 3

65-69

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