The role of eddies in a laboratory study of the Antarctic Circumpolar Current

2003 ◽  
Author(s):  
D. Sutherland ◽  
C. Cenedese
Keyword(s):  
Laboratory Study ◽  
Antarctic Circumpolar Current ◽  
Circumpolar Current ◽  
The Antarctic

scholarly journals Gill’s model of the Antarctic Circumpolar Current, revisited: The role of latitudinal variations in wind stress

2016 ◽  
Vol 97 ◽  
pp. 37-51 ◽  
Author(s):  
David P. Marshall ◽  
David R. Munday ◽  
Lesley C. Allison ◽  
Russell J. Hay ◽  
Helen L. Johnson
Keyword(s):  
Wind Stress ◽  
Antarctic Circumpolar Current ◽  
Latitudinal Variations ◽  
Circumpolar Current ◽  
The Antarctic

scholarly journals The dynamical balance, transport and circulation of the Antarctic Circumpolar Current

2004 ◽  
Vol 16 (4) ◽  
pp. 439-470 ◽  
Author(s):  
DIRK OLBERS ◽  
DANIEL BOROWSKI ◽  
CHRISTOPH VÖLKER ◽  
JORG-OLAF WÖLFF
Keyword(s):  
Wind Stress ◽  
Antarctic Circumpolar Current ◽  
Meridional Circulation ◽  
Buoyancy Flux ◽  
Momentum Balance ◽  
Linear Wave ◽  
Dynamical Balance ◽  
Circumpolar Current ◽  
The Antarctic

The physical elements of the circulation of the Antarctic Circumpolar Current (ACC) are reviewed. A picture of the circulation is sketched by means of recent observations from the WOCE decade. We present and discuss the role of forcing functions (wind stress, surface buoyancy flux) in the dynamical balance of the flow and in the meridional circulation and study their relation to the ACC transport. The physics of form stress at tilted isopycnals and at the ocean bottom are elucidated as central mechanisms in the momentum balance. We explain the failure of the Sverdrup balance in the ACC circulation and highlight the role of geostrophic contours in the balance of vorticity. Emphasis is on the interrelation of the zonal momentum balance and the meridional circulation, the importance of diapycnal mixing and eddy processes. Finally, new model concepts are described: a model of the ACC transport dependence on wind stress and buoyancy flux, based on linear wave theory; and a model of the meridional overturning and the mean density structure of the Southern Ocean, based on zonally averaged dynamics and thermodynamics with eddy parametrization.

scholarly journals Role of Residual Overturning for the Sensitivity of Southern Ocean Isopycnal Slopes to Changes in Wind Forcing

2019 ◽  
Vol 49 (11) ◽  
pp. 2867-2881
Author(s):  
Madeleine K. Youngs ◽  
Glenn R. Flierl ◽  
Raffaele Ferrari
Keyword(s):  
Southern Ocean ◽  
Wind Stress ◽  
Antarctic Circumpolar Current ◽  
Channel Model ◽  
Critical Level ◽  
Wind Forcing ◽  
Global Ocean ◽  
Circumpolar Current ◽  
The Antarctic

AbstractThe Antarctic Circumpolar Current plays a central role in the ventilation of heat and carbon in the global ocean. In particular, the isopycnal slopes determine where each water mass outcrops and thus how the ocean interacts with the atmosphere. The region-integrated isopycnal slopes have been suggested to be eddy saturated, that is, stay relatively constant as the wind forcing changes, but whether or not the flow is saturated in realistic present day and future parameter regimes is unknown. This study analyzes an idealized two-layer quasigeostrophic channel model forced by a wind stress and a residual overturning generated by a mass flux across the interface between the two layers, with and without a blocking ridge. The sign and strength of the residual overturning set which way the isopycnal slopes change with the wind forcing, leading to an increase in slope with an increase in wind forcing for a positive overturning and a decrease in slope for a negative overturning, following the usual conventions; this behavior is caused by the dominant standing meander weakening as the wind stress weakens causing the isopycnal slopes to become more sensitive to changes in the wind stress and converge with the slopes of a flat-bottomed simulation. Eddy saturation only appears once the wind forcing passes a critical level. These results show that theories for saturation must have both topography and residual overturning in order to be complete and provide a framework for understanding how the isopycnal slopes in the Southern Ocean may change in response to future changes in wind forcing.

scholarly journals Deciphering the role of southern gateways and carbon dioxide on the onset of the Antarctic Circumpolar Current

2012 ◽  
Vol 27 (4) ◽  
Author(s):  
Vincent Lefebvre ◽  
Yannick Donnadieu ◽  
Pierre Sepulchre ◽  
Didier Swingedouw ◽  
Zhong-Shi Zhang
Keyword(s):  
Carbon Dioxide ◽  
Antarctic Circumpolar Current ◽  
Circumpolar Current ◽  
The Antarctic

Onset and role of the Antarctic Circumpolar Current

2007 ◽  
Vol 54 (21-22) ◽  
pp. 2388-2398 ◽  
Author(s):  
Peter F. Barker ◽  
Gabriel M. Filippelli ◽  
Fabio Florindo ◽  
Ellen E. Martin ◽  
Howard D. Scher
Keyword(s):  
Antarctic Circumpolar Current ◽  
Circumpolar Current ◽  
The Antarctic

scholarly journals Nonlinear Differential Equations Modeling the Antarctic Circumpolar Current

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Jifeng Chu ◽  
Kateryna Marynets
Keyword(s):  
Fixed Point ◽  
Differential Equations ◽  
Boundary Conditions ◽  
Topological Degree ◽  
Antarctic Circumpolar Current ◽  
Fixed Point Theorems ◽  
Nonlinear Differential Equations ◽  
Existence Results ◽  
Circumpolar Current ◽  
The Antarctic

AbstractThe aim of this paper is to study one class of nonlinear differential equations, which model the Antarctic circumpolar current. We prove the existence results for such equations related to the geophysical relevant boundary conditions. First, based on the weighted eigenvalues and the theory of topological degree, we study the semilinear case. Secondly, the existence results for the sublinear and superlinear cases are proved by fixed point theorems.

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