Journal cover Journal topic
Ocean Science An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 2.539 IF 2.539
  • IF 5-year value: 3.129 IF 5-year
    3.129
  • CiteScore value: 2.78 CiteScore
    2.78
  • SNIP value: 1.217 SNIP 1.217
  • IPP value: 2.62 IPP 2.62
  • SJR value: 1.370 SJR 1.370
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 48 Scimago H
    index 48
  • h5-index value: 32 h5-index 32
Discussion papers
https://doi.org/10.5194/os-2020-4
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2020-4
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 04 Feb 2020

Submitted as: research article | 04 Feb 2020

Review status
This preprint is currently under review for the journal OS.

Connecting flow-topography interactions, vorticity balance, baroclinic instability and transport in the Southern Ocean: the case of an idealized storm track

Julien Jouanno1 and Xavier Capet2 Julien Jouanno and Xavier Capet
  • 1LEGOS, Université de Toulouse, IRD, CNRS, CNES, UPS, Toulouse, France
  • 2CNRS-IRD-Sorbonne Universités, UPMC, MNHN, LOCEAN Laboratory, Paris, France

Abstract. The dynamical balance of the Antarctic circumpolar current and their implications on the functioning of the world ocean are not fully understood and poorly represented in global circulation models. In this study, the sensitivities of an idealized Southern Ocean (SO) storm track are explored with a set of eddy-rich numerical simulations. The 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. Configurations with a rough bottom have weak barotropic motions, no wind-driven gyre in the lee of topographic ridges, less efficient baroclinic turbulence, and thus larger circumpolar transport rates. The difference in circumpolar transport 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. The study highlights the need for a comprehensive treatment of the Antartic Circumpolar Current (ACC) interactions with the ocean floor. It also sheds some light on the behavior of idealized storm tracks recently modelled: 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 time scales (from months to years) depending on the possibility (or not) for barotropic Rossby waves to propagate signals of wind change and accelerate/decelerate SO wind-driven gyres. The real SO with a typical ACC saturation time scale of 2–3 years seems to lie in the “rough bottom/no wind-driven gyre” regime.

Julien Jouanno and Xavier Capet

Interactive discussion

Status: open (until 31 Mar 2020)
Status: open (until 31 Mar 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Julien Jouanno and Xavier Capet

Julien Jouanno and Xavier Capet

Viewed

Total article views: 182 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
153 26 3 182 3 5
  • HTML: 153
  • PDF: 26
  • XML: 3
  • Total: 182
  • BibTeX: 3
  • EndNote: 5
Views and downloads (calculated since 04 Feb 2020)
Cumulative views and downloads (calculated since 04 Feb 2020)

Viewed (geographical distribution)

Total article views: 124 (including HTML, PDF, and XML) Thereof 123 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 28 Mar 2020
Publications Copernicus
Download
Short summary
The dynamical balance of the Antarctic circumpolar current and their implications on the functioning of the world ocean are not fully understood and poorly represented in global circulation models. In this study, the sensitivities of an idealized Southern Ocean (SO) storm track are explored with a set of eddy-rich numerical simulations. We show that the classical partition between barotropic and baroclinic modes is sensitive to current-topography interactions in the mesoscale range 10-100 km.
The dynamical balance of the Antarctic circumpolar current and their implications on the...
Citation