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Southern Ocean Overturning Across Streamlines in an Eddying Simulation of the Antarctic Circumpolar Current : Volume 3, Issue 4 (19/12/2007)

By Treguier, A. M.

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Book Id: WPLBN0004020343
Format Type: PDF Article :
File Size: Pages 17
Reproduction Date: 2015

Title: Southern Ocean Overturning Across Streamlines in an Eddying Simulation of the Antarctic Circumpolar Current : Volume 3, Issue 4 (19/12/2007)  
Author: Treguier, A. M.
Volume: Vol. 3, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Rintoul, S. R., Madec, G., England, M. H., Molines, J., Sommer, J. L., & Treguier, A. M. (2007). Southern Ocean Overturning Across Streamlines in an Eddying Simulation of the Antarctic Circumpolar Current : Volume 3, Issue 4 (19/12/2007). Retrieved from http://worldpubliclibrary.org/


Description
Description: Laboratoire de Physique de Oceans, CNRS-IFREMER-UBO, Plouzané, France. An eddying global model is used to study the characteristics of the Antarctic Circumpolar Current (ACC) in a streamline-following framework. Previous model-based estimates of the meridional circulation were calculated using zonal averages: this method leads to a counter-intuitive poleward circulation of the less dense waters, and underestimates the eddy effects. We show that on the contrary, the upper ocean circulation across streamlines agrees with the theoretical view: an equatorward mean flow partially cancelled by a poleward eddy mass flux. Two model simulations, in which the buoyancy forcing above the ACC changes from positive to negative, suggest that the relationship between the residual meridional circulation and the surface buoyancy flux is not as straightforward as assumed by the simplest theoretical models: the sign of the residual circulation cannot be inferred from the surface buoyancy forcing only. Among the other processes that likely play a part in setting the meridional circulation, our model results emphasize the complex three-dimensional structure of the ACC (probably not well accounted for in streamline-averaged, two-dimensional models) and the distinct role of temperature and salinity in the definition of the density field. Heat and salt transports by the time-mean flow are important even across time-mean streamlines. Heat and salt are balanced in the ACC, the model drift being small, but the nonlinearity of the equation of state cannot be ignored in the density balance.

Summary
Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current

Excerpt
Barnier, B., Madec, G., Penduff, T., Molines, J.M., Treguier, A.M., Le Sommer, J., Beckmann, A., Biastoch, A., Böning, C., Dengg, J., Derval, C., Durand, E., Gulev, S., Remy, E., Talandier, C., Theetten, S., Maltrud, M., McClean, J., and De Cuevas, B.: Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy permitting resolution, Ocean Dynam., doi:10.1007/s10236-006-0082-1, 2006. \bibitem[]brodeau2007 Brodeau L.: Contribution à l'amélioration de la fonction de forcage des mod`eles de circulation générale océanique, PhD thesis, université Joseph Fourier Grenoble 1, 2007. \bibitem[]danabasoglu2004 Danabasoglu, G., McWilliams, J. C., and Gent, P. R.: The role of mesoscale tracer transports in the global ocean circulation, Science, 264, 1123–1126, 1994. \bibitem[]deboyer2007 de Boyer Montégut, C., Mignot, J., Lazar, A., and Cravatte, S.: Control of salinity on the mixed layer depth in the world ocean. Part I: General description, J. Geophys. Res., 112, C06011, doi:10.1029/2006JC003953, 2007 \bibitem[]doos94 Döös, K. and Webb, D.: The Deacon cell and other meridional cells of the Southern Ocean, J. Phys. Oceanogr., 24, 429–442, 1994. \bibitem[]ducet2000 Ducet, N., Le Traon, P. Y., and Reverdin, G.: Global high resolution mapping of ocean circulation form Topex/Poseidon and ERS-1 and 2, J. Geophys. Res., 105(C8), 19 477–19 498, 2000. \bibitem[]eden2006 Eden, C.: Thickness diffusivity in the Southern Ocean, Geophys. Res. lets., L11606, doi:10.1029/2006/GL026157, 2006. \bibitem[]gallego2004 Gallego, B., Cessi, P., and McWilliams, J. C.: The Antarctic Circumpolar Current in equilibrium, J. Phys. Oceanogr., 34, 1571–1587, 2004. \bibitem[]gent1995 Gent, P.R., Willebrand, J., McDougall, T. J., and McWilliams, J. C.: Parameterizing eddy-induced tracer transports in ocean circulation models, J. Phys. Oceanogr., 25, 463–474, 1995. \bibitem[]gille2003 Gille, S.: Float observations of the Southern Ocean. Part II: Eddy fluxes, J. Phys. Oceanogr., 33, 1182–1196, 2003. \bibitem[]held1999 Held, I. and Schneider, T.: The surface branch of the zonally averaged mass transport circulation of the troposphere, J. Atmos. Sci., 56, 1688–1697, 1999. \bibitem[]hallberg2006 Hallberg, R. and Gnanadesikan, A.: The Role of Eddies in Determining the Structure and Response of the Wind-Driven Southern Hemisphere Overturning: Results from the Modeling Eddies in the Southern Ocean (MESO) Project, J. Phys. Oceanogr., 36, 2232–2252, 2006. \bibitem[]iudicone2007 Iudicone, D., Madec, G., and McDougall, T. J.: Water mass transformations in a neutral density framework and the key role of light penetration, J. Phys. Oceanogr., in press, 2007. \bibitem[]ivchenko96 Ivchenko, V. O., Richards, K. J., and Stevens, D. P.: The dynamics of the Antarctic Circumpolar Current, J. Phys. Oceanogr., 26, 753–774, 1996. \bibitem[]jayne2002 Jayne, S. R. and Marotzke, J.: The oceanic eddy heat transport, J. Phys. Oceanogr. 32, 3328–3345, 2002. \bibitem[]karsten2002 Karsten, R. H. and Marshall, J.: Inferring the residual circulation of the Antarctic Circumpolar Current from observations using dynamical theory, J. Phys. oceanogr., 32, 3315–3327, 2002. \bibitem[]large2004 Large, W. and Yeager, S.: Diurnal to decadal global forcing for ocean and sea-ice models: the datasets and flux climatologies. NCAR technical note: NCAR/TN-460+STR, CGD division of the National Center for Atmospheric Research, Available on the GFDL CORE web site, 2004. \bibitem[]lee2003 Lee, M. M. and Coward, A. C.: Eddy mass transport for the Southern Ocean in an eddy-permitting global ocean model, Ocean Modelling, 5, 249–266, 2003. \bibitem[]lee2002 Lee, M. M., Coward, A. C., and Nurser, A. J.: Spurious diapycnal mixing of the deep waters in an eddy-permitting global ocean model, J. Phys. Oceanogr., 32, 1522–1535, 2002. \bibitem[]lee2007 Lee, M. M., Nur

 

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