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-2019-114
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2019-114
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 28 Oct 2019

Submitted as: research article | 28 Oct 2019

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

Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model

Mathieu Le Corre, Jonathan Gula, and Anne-Marie Tréguier Mathieu Le Corre et al.
  • Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France

Abstract. The circulation in the North Atlantic Subpolar gyre is complex and strongly influenced by the topography. The gyre dynamics is traditionally understood as the result of a topographic Sverdrup balance, which corresponds to a first order balance between the planetary vorticity advection, the bottom pressure torque and the wind stress curl. However, this dynamics has been studied mostly with non-eddy-resolving models and a crude representation of the bottom topography. Here we revisit the barotropic vorticity balance of the North Atlantic Subpolar gyre using a high resolution simulation (≈ 2-km) with topography-following vertical coordinates to better represent the mesoscale turbulence and flow-topography interactions. Our findings highlight that, locally, there is a first order balance between the bottom pressure torque and the nonlinear terms, albeit with a high degree of cancellation between each other. However, balances integrated over different regions of the gyre – shelf, slope and interior – still highlight the important role played by nonlinearities and the bottom drag curls. In particular the topographic Sverdrup balance cannot describe the dynamics in the interior of the gyre. The main sources of cyclonic vorticity are the nonlinear terms due to eddies generated along eastern boundary currents and the time-mean nonlinear terms from the Northwest Corner. Our results suggest that a good representation of the mesoscale activity along with a good positioning of the Northwest corner are two important conditions for a better representation of the circulation in the North Atlantic Subpolar Gyre.

Mathieu Le Corre et al.

Interactive discussion

Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Login for Authors/Topic Editors] [Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Mathieu Le Corre et al.

Data sets

NOAA drifter L. C. Laurindo, A. J.Mariano, and R. Lumpkin https://doi.org/10.1016/j.dsr.2017.04.009

ISAS M. Ollitrault and J.-P. Rannou https://doi.org/10.1175/JTECH-D-12-00073.1

Mathieu Le Corre et al.

Viewed

Total article views: 348 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
265 74 9 348 12 12
  • HTML: 265
  • PDF: 74
  • XML: 9
  • Total: 348
  • BibTeX: 12
  • EndNote: 12
Views and downloads (calculated since 28 Oct 2019)
Cumulative views and downloads (calculated since 28 Oct 2019)

Viewed (geographical distribution)

Total article views: 219 (including HTML, PDF, and XML) Thereof 219 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 19 Feb 2020
Publications Copernicus
Download
Short summary
The ocean circulation is crucial for the climate and the North Atlantic subpolar gyre is a key component of the meridional heat transport. In this study we use a high resolution simulation with bottom following coordinates to investigate the gyre dynamics. We show that non-linear processes, underestimated in most climate models, control the circulation in the gyre interior. This result contrasts with the classical theory putting forward the wind effects on the large scale circulation.
The ocean circulation is crucial for the climate and the North Atlantic subpolar gyre is a key...
Citation