On the Dynamics of Wind-Driven Circumpolar Currents
- 1 November 2001
- journal article
- Published by American Meteorological Society in Journal of Physical Oceanography
- Vol. 31 (11), 3258-3273
- https://doi.org/10.1175/1520-0485(2001)031<3258:otdowd>2.0.co;2
Abstract
The factors controlling the transport of the Antarctic Circumpolar Current (ACC) have recently been a topic of heated debate. At the latitudes of Drake Passage, potential vorticity contours are uninterrupted by coastlines, and large amplitude flows are possible even with weak forcing and dissipation. The relationship between the dynamics of circumpolar currents and inertial recirculations in closed basins is discussed. In previous studies, Sverdrup balance and baroclinic adjustment theories have both been proposed as theories of the ACC transport. These theories predict the circumpolar transport as various simple functions of the surface wind stress. A series of experiments is performed with a simple channel model, with different wind strengths and different idealized basin geometries, to investigate the relationship between wind strength and circumpolar transport. The results show that baroclinic adjustment theories do predict transport in the special case of a periodic channel with no topographic variations, or when the wind forcing is very weak. More generally, the transport is determined by a complex interplay between wind forcing, eddy fluxes, and topographic effects. There is no support for the idea that Sverdrup balance determines the transport through Drake Passage.Keywords
This publication has 36 references indexed in Scilit:
- What sets the mean transport through Drake Passage?Journal of Geophysical Research: Oceans, 2001
- On the Relationship of the Circumpolar Current to Southern Hemisphere Winds in Coarse-Resolution Ocean ModelsJournal of Physical Oceanography, 2000
- Wind-Driven Transport Fluctuations through Drake Passage: A Southern ModeJournal of Physical Oceanography, 1999
- Eddies in Numerical Models of the Antarctic Circumpolar Current and Their Influence on the Mean FlowJournal of Physical Oceanography, 1999
- The Southern Ocean Momentum Balance: Evidence for Topographic Effects from Numerical Model Output and Altimeter DataJournal of Physical Oceanography, 1997
- Comments on “On the Obscurantist Physics of ‘Form Drag’ in Theorizing about the Circumpolar Current”Journal of Physical Oceanography, 1997
- The Dynamics of the Antarctic Circumpolar CurrentJournal of Physical Oceanography, 1996
- On the Catalytic Role of High Baroclinic Modes in Eddy-driven Large-Scale CirculationsJournal of Physical Oceanography, 1991
- On Intermediate Models for Barotropic Continental Shelf and Slope Flow Fields. Part III: Comparison of Numerical Model Solutions in Periodic ChannelsJournal of Physical Oceanography, 1990
- Transfer properties of the large‐scale eddies and the general circulation of the atmosphereQuarterly Journal of the Royal Meteorological Society, 1970