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A mechanism for jet drift over topography

  • Hemant Khatri (a1) and Pavel Berloff (a1)

Abstract

The dynamics of multiple alternating oceanic jets has been studied in the presence of a simple bottom topography with constant slope in the zonal direction. A baroclinic quasi-geostrophic model forced with a horizontally uniform and vertically sheared background flow generates mesoscale eddies and jets that are tilted from the zonal direction and drift with constant speed. The governing dynamical equations are rewritten in a tilted frame of reference moving with the jets, and the cross-jet time-mean profiles of the linear and nonlinear stress terms are analysed. Here, the linear stress terms are present because of the zonally asymmetric topography. It is demonstrated that the linear dynamics controls the drift mechanism. Also, it is found that the drifting jets are directly forced by the imposed vertical shear, whereas the eddies oppose the jets, although this is limited to continuously forced dissipative systems. This role of the eddies is opposite to the one in the classical baroclinic model of stationary, zonally symmetric multiple jets. This is expected to be more generic in the ocean, which is zonally asymmetric nearly everywhere.

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Corresponding author

Email address for correspondence: h.khatri16@imperial.ac.uk

References

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Abernathey, R. & Cessi, P. 2014 Topographic enhancement of eddy efficiency in baroclinic equilibration. J. Phys. Oceanogr. 44 (8), 21072126.
Abernathey, R., Marshall, J., Mazloff, M. & Shuckburgh, E. 2010 Enhancement of mesoscale eddy stirring at steering levels in the Southern Ocean. J. Phys. Oceanogr. 40 (1), 170184.
Arbic, B. K. & Flierl, G. R. 2004 Effects of mean flow direction on energy, isotropy, and coherence of baroclinically unstable beta-plane geostrophic turbulence. J. Phys. Oceanogr. 34 (1), 7793.
Baldwin, M. P., Rhines, P. B., Huang, H. P. & McIntyre, M. E. 2007 The jet-stream conundrum. Science 315 (5811), 467468.
Barthel, A., Hogg, A., Waterman, S. & Keating, S. 2017 Jet–topography interactions affect energy pathways to the deep Southern Ocean. J. Phys. Oceanogr. 47 (7), 17991816.
Beebe, R. F., Ingersoll, A. P., Hunt, G. E., Mitchell, J. L. & Müller, J. P. 1980 Measurements of wind vectors, eddy momentum transports, and energy conversions in Jupiter’s atmosphere from Voyager 1 images. Geophys. Res. Lett. 7 (1), 14.
Berloff, P. 2005a On dynamically consistent eddy fluxes. Dyn. Atmos. Oceans 38 (3), 123146.
Berloff, P. 2005b On rectification of randomly forced flows. J. Mar. Res. 63 (3), 497527.
Berloff, P. & Kamenkovich, I. 2013a On spectral analysis of mesoscale eddies. Part I: linear analysis. J. Phys. Oceanogr. 43 (12), 25052527.
Berloff, P. & Kamenkovich, I. 2013b On spectral analysis of mesoscale eddies. Part II: nonlinear analysis. J. Phys. Oceanogr. 43 (12), 25282544.
Berloff, P., Kamenkovich, I. & Pedlosky, J. 2009a A mechanism of formation of multiple zonal jets in the oceans. J. Fluid Mech. 628, 395425.
Berloff, P., Kamenkovich, I. & Pedlosky, J. 2009b A model of multiple zonal jets in the oceans: dynamical and kinematical analysis. J. Phys. Oceanogr. 39 (11), 27112734.
Berloff, P., Karabasov, S., Farrar, J. T. & Kamenkovich, I. 2011 On latency of multiple zonal jets in the oceans. J. Fluid Mech. 686, 534567.
Boland, E., Thompson, A. F., Shuckburgh, E. & Haynes, P. 2012 The formation of nonzonal jets over sloped topography. J. Phys. Oceanogr. 42 (10), 16351651.
Buckingham, C. E. & Cornillon, P. C. 2013 The contribution of eddies to striations in absolute dynamic topography. J. Geophys. Res. Oceans 118 (1), 448461.
Chan, C. J., Plumb, R. A. & Cerovecki, I. 2007 Annular modes in a multiple migrating zonal jet regime. J. Atmos. Sci. 64 (11), 40534068.
Charney, J. C. 1971 Geostrophic turbulence. J. Atmos. Sci. 28, 10871095.
Chelton, D. B., Deszoeke, R. A., Schlax, M. G., El Naggar, K. & Siwertz, N. 1998 Geographical variability of the first baroclinic Rossby radius of deformation. J. Phys. Oceanogr. 28 (3), 433460.
Chemke, R. & Kaspi, Y. 2015a The latitudinal dependence of atmospheric jet scales and macroturbulent energy cascades. J. Atmos. Sci. 72 (10), 38913907.
Chemke, R. & Kaspi, Y. 2015b Poleward migration of eddy-driven jets. J Adv. Model. Earth Syst. 7 (3), 14571471.
Chen, C. & Kamenkovich, I. 2013 Effects of topography on baroclinic instability. J. Phys. Oceanogr. 43 (4), 790804.
Chen, C., Kamenkovich, I. & Berloff, P. 2015 On the dynamics of flows induced by topographic ridges. J. Phys. Oceanogr. 45 (3), 927940.
Chen, C., Kamenkovich, I. & Berloff, P. 2016 Eddy trains and striations in quasigeostrophic simulations and the ocean. J. Phys. Oceanogr. 46 (9), 28072825.
Cho, J. Y. K. & Polvani, L. M. 1996 The emergence of jets and vortices in freely evolving, shallow-water turbulence on a sphere. Phys. Fluids 8 (6), 15311552.
Connaughton, C. P., Nadiga, B. T., Nazarenko, S. V. & Quinn, B. E. 2010 Modulational instability of Rossby and drift waves and generation of zonal jets. J. Fluid Mech. 654, 207231.
Constantinou, N. C., Farrell, B. F. & Ioannou, P. J. 2014 Emergence and equilibration of jets in beta-plane turbulence: applications of stochastic structural stability theory. J. Atmos. Sci. 71 (5), 18181842.
Cravatte, S., Kessler, W. S. & Marin, F. 2012 Intermediate zonal jets in the tropical Pacific Ocean observed by Argo floats. J. Phys. Oceanogr. 42 (9), 14751485.
Cravatte, S., Kestenare, E., Marin, F., Dutrieux, P. & Firing, E. 2017 Subthermocline and intermediate zonal currents in the tropical Pacific Ocean: paths and vertical structure. J. Phys. Oceanogr. 47 (9), 23052324.
Dritschel, D. G. & McIntyre, M. E. 2008 Multiple jets as PV staircases: the Phillips effect and the resilience of eddy-transport barriers. J. Atmos. Sci. 65 (3), 855874.
Dunkerton, T. J. & Scott, R. K. 2008 A barotropic model of the angular momentum-conserving potential vorticity staircase in spherical geometry. J. Atmos. Sci. 65 (4), 11051136.
Farrell, B. F. & Ioannou, P. J. 2007 Structure and spacing of jets in barotropic turbulence. J. Atmos. Sci. 64 (10), 36523665.
Gierasch, P. J., Conrath, B. J. & Magalha, J. A. 1986 Zonal mean properties of Jupiter’s upper troposphere from Voyager infrared observations. Icarus 67 (3), 456483.
Hannachi, A., Jolliffe, I. T. & Stephenson, D. B. 2007 Empirical orthogonal functions and related techniques in atmospheric science: a review. Intl J. Climatol. 27 (9), 11191152.
Hart, J. E. 1975 Baroclinic instability over a slope. Part I: linear theory. J. Phys. Oceanogr. 5 (4), 625633.
Hristova, H. G., Pedlosky, J. & Spall, M. A. 2008 Radiating instability of a meridional boundary current. J. Phys. Oceanogr. 38 (10), 22942307.
Huang, H. P. & Robinson, W. A. 1998 Two-dimensional turbulence and persistent zonal jets in a global barotropic model. J. Atmos. Sci. 55 (4), 611632.
Ingersoll, A. P., Beebe, R. F., Mitchell, J. L., Garneau, G. W., Yagi, G. M. & Müller, J. P. 1981 Interaction of eddies and mean zonal flow on Jupiter as inferred from Voyager 1 and 2 images. J. Geophys. Res. Space Phys. 86 (A10), 87338743.
Ingersoll, A. P., Gierasch, P. J., Banfield, D., Vasavada, A. R. & Team, G. I. 2000 Moist convection as an energy source for the large-scale motions in Jupiter’s atmosphere. Nature 403 (6770), 630632.
Kamenkovich, I., Berloff, P. & Pedlosky, J. 2009 Role of eddy forcing in the dynamics of multiple zonal jets in a model of the North Atlantic. J. Phys. Oceanogr. 39 (6), 13611379.
Karabasov, S. A., Berloff, P. & Goloviznin, V. M. 2009 Cabaret in the ocean gyres. Ocean Model. 30 (2), 155168.
Kramer, W., van Buren, M. G., Clercx, H. J. H. & van Heijst, G. J. F. 2006 𝛽-plane turbulence in a basin with no-slip boundaries. Phys. Fluids 18 (2), 026603.
Lu, J. & Speer, K. 2010 Topography, jets, and eddy mixing in the Southern Ocean. J. Mar. Res. 68 (3–1), 479502.
Maltrud, M. E. & Vallis, G. K. 1991 Energy spectra and coherent structures in forced two-dimensional and beta-plane turbulence. J. Fluid Mech. 228, 321342.
Marston, J. B., Conover, E. & Schneider, T. 2008 Statistics of an unstable barotropic jet from a cumulant expansion. J. Atmos. Sci. 65 (6), 19551966.
Maximenko, N. A., Bang, B. & Sasaki, H. 2005 Observational evidence of alternating zonal jets in the world ocean. Geophys. Res. Lett. 32, L12607.
McIntyre, M. E. 1982 How well do we understand the dynamics of stratospheric warmings? J. Meteorol. Soc. Japan II 60 (1), 3765.
Melnichenko, O. V., Maximenko, N. A., Schneider, N. & Sasaki, H. 2010 Quasi-stationary striations in basin-scale oceanic circulation: vorticity balance from observations and eddy-resolving model. Ocean Dyn. 60 (3), 653666.
Nadiga, B. T. 2006 On zonal jets in oceans. Geophys. Res. Lett. 33, L12607.
Nakano, H. & Hasumi, H. 2005 A series of zonal jets embedded in the broad zonal flows in the Pacific obtained in eddy-permitting ocean general circulation models. J. Phys. Oceanogr. 35 (4), 474488.
Panetta, R. L. 1993 Zonal jets in wide baroclinically unstable regions: persistence and scale selection. J. Atmos. Sci. 50 (14), 20732106.
Qiu, B., Chen, S. & Sasaki, H. 2013 Generation of the North Equatorial Undercurrent jets by triad baroclinic Rossby wave interactions. J. Phys. Oceanogr. 43 (12), 26822698.
Read, P. L., Conrath, B. J., Fletcher, L. N., Gierasch, P. J., Simon-Miller, A. A. & Zuchowski, L. C. 2009 Mapping potential vorticity dynamics on Saturn: zonal mean circulation from Cassini and Voyager data. Planet. Space Sci. 57 (14), 16821698.
Rhines, P. B. 1975 Waves and turbulence on a beta-plane. J. Fluid Mech. 69 (03), 417443.
Richards, K. J., Maximenko, N. A., Bryan, F. O. & Sasaki, H. 2006 Zonal jets in the Pacific Ocean. Geophys. Res. Lett. 33, L03605.
Scott, R. K. & Polvani, L. M. 2007 Forced-dissipative shallow-water turbulence on the sphere and the atmospheric circulation of the giant planets. J. Atmos. Sci. 64 (9), 31583176.
Sinha, B. & Richards, K. J. 1999 Jet structure and scaling in Southern Ocean models. J. Phys. Oceanogr. 29 (6), 11431155.
Smith, S. 2007 Eddy amplitudes in baroclinic turbulence driven by nonzonal mean flow: shear dispersion of potential vorticity. J. Phys. Oceanogr. 37 (4), 10371050.
Sokolov, S. & Rintoul, S. R. 2007 Multiple jets of the Antarctic circumpolar current south of Australia. J. Phys. Oceanogr. 37 (5), 13941412.
Srinivasan, K. 2013 Stochastically Forced Zonal Flows. University of California.
Srinivasan, K. & Young, W. R. 2012 Zonostrophic instability. J. Atmos. Sci. 69 (5), 16331656.
Stern, A., Nadeau, L. P. & Holland, D. 2015 Instability and mixing of zonal jets along an idealized continental shelf break. J. Phys. Oceanogr. 45 (9), 23152338.
Sukoriansky, S., Dikovskaya, N. & Galperin, B. 2007 On the arrest of inverse energy cascade and the Rhines scale. J. Atmos. Sci. 64 (9), 33123327.
Thompson, A. F. 2010 Jet formation and evolution in baroclinic turbulence with simple topography. J. Phys. Oceanogr. 40 (2), 257278.
Thompson, A. F. & Naveira Garabato, A. C. 2014 Equilibration of the Antarctic circumpolar current by standing meanders. J. Phys. Oceanogr. 44 (7), 18111828.
Thompson, A. F. & Richards, K. J. 2011 Low frequency variability of Southern Ocean jets. J. Geophys. Res. Oceans 116, C09022.
Thompson, A. F. & Young, W. R. 2007 Two-layer baroclinic eddy heat fluxes: zonal flows and energy balance. J. Atmos. Sci. 64 (9), 32143231.
Tréguier, A. M. & Panetta, R. L. 1994 Multiple zonal jets in a quasigeostrophic model of the Antarctic circumpolar current. J. Phys. Oceanogr. 24 (11), 22632277.
Vallis, G. K. 2017 Atmospheric and Oceanic Fluid Dynamics. Cambridge University Press.
Vallis, G. K. & Maltrud, M. E. 1993 Generation of mean flows and jets on a beta plane and over topography. J. Phys. Oceanogr. 23 (7), 13461362.
Van Sebille, E., Kamenkovich, I. & Willis, J. K. 2011 Quasi-zonal jets in 3-D Argo data of the Northeast Atlantic. Geophys. Res. Lett. 38, L02606.
Wang, J., Spall, M. A., Flierl, G. R. & Malanotte-Rizzoli, P. 2012 A new mechanism for the generation of quasi-zonal jets in the ocean. Geophys. Res. Lett. 39, L10601.
Williams, G. P. 1979 Planetary circulations: 2. The Jovian quasi-geostrophic regime. J. Atmos. Sci. 36 (5), 932969.
Williams, G. P. 2003 Jovian dynamics. Part III: multiple, migrating, and equatorial jets. J. Atmos. Sci. 60 (10), 12701296.
Young, R. M. B. & Read, P. L. 2017 Forward and inverse kinetic energy cascades in Jupiter’s turbulent weather layer. Nat. Phys. 13 (11), 1135.
Youngs, M. K., Thompson, A. F., Lazar, A. & Richards, K. 2017 ACC meanders, energy transfer, and mixed barotropic–baroclinic instability. J. Phys. Oceanogr. 47 (6), 12911305.
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A mechanism for jet drift over topography

  • Hemant Khatri (a1) and Pavel Berloff (a1)

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