@article{fdi:010079950,
  title = {{C}onnecting flow-topography interactions, vorticity balance, baroclinic instability and transport in the {S}outhern {O}cean : the case of an idealized storm track},
  author = {{J}ouanno, {J}ulien and {C}apet, {X}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he dynamical balance of the {A}ntarctic {C}ircumpolar {C}urrent and its implications on the functioning of the world ocean are not fully understood and poorly represented in global circulation models. {I}n this study, the sensitivities of an idealized {S}outhern {O}cean ({SO}) storm track are explored with a set of eddy-rich numerical simulations. {T}he classical partition between barotropic and baroclinic modes is sensitive to current-topography interactions in the mesoscale range 10-100 km, as comparisons between simulations with rough or smooth bathymetry reveal. {C}onfigurations with a rough bottom have weak barotropic motions, ubiquitous bottom form stress/pressure torque, no wind-driven gyre in the lee of topographic ridges, less efficient baroclinic turbulence and, thus, larger circumpolar transport rates. {T}he difference in circumpolar transport produced by topographic roughness depends on the strength with which (external) thermohaline forcings by the rest of the world ocean constrain the stratification at the northern edge of the {SO}. {T}he study highlights the need for a more comprehensive treatment of the {A}ntarctic {C}ircumpolar {C}urrent ({ACC}) interactions with the ocean floor, including realistic fields of bottom form stress and pressure torque. {I}t also sheds some light on the behavior of idealized storm tracks recently modeled: (i) the saturation mechanism, whereby the circumpolar transport does not depend on wind intensity, is a robust and generic attribute of {ACC}-like circumpolar flows; (ii) the adjustment toward saturation can take place over widely different timescales (from months to years) depending on the possibility (or not) for barotropic {R}ossby waves to propagate signals of wind change and accelerate/decelerate {SO} wind-driven gyres. {T}he real {SO} having both gyres and {ACC} saturation timescales typical of our "no gyre" simulations may be in an intermediate regime in which mesoscale topography away from major ridges provides partial and localized support for bottom form stress/pressure torque.},
  keywords = {{OCEAN} {AUSTRAL} ; {ANTARCTIQUE}},
  booktitle = {},
  journal = {{O}cean {S}cience},
  volume = {16},
  numero = {5},
  pages = {1207--1223},
  ISSN = {1812-0784},
  year = {2020},
  DOI = {10.5194/os-16-1207-2020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079950},
}