Physical model of bathymetric effects on the Antarctic circumpolar current
- Arizona State Univ., Tempe (United States)
- Univ. of Dundee (United Kingdom)
Laboratory experiments were conducted to simulate some of the effects of the bathymetry of the southern ocean on the physical characteristics of the Antarctic Circumpolar Current (ACC). An idealized zonal wind stress, which varied inversely with the distance from the model Antarctic continent, was simulated in the laboratory model by a radially inward sink-source flow in a thin layer along the surface of the circular test cell. The present model, however, has the limitation of not accounting for such factors as the longitudinal variations in the wind shear and the decrease in wind stress on approaching the Antarctic continent from the north. Planetary beta effects were neglected because the topographic beta term can be shown to dominate over large portions of the model area. The neglect of beta effects is also a limitation of the model. In spite of these limitations, however, the simulations of the physical model for both the homogeneous and linearly stratified cases were shown to be in good agreement with observations of the ACC. These include well-defined strong currents along the mid-ocean ridge; strong perturbations in the vicinity of the Macquarie Ridge, Campbell Plateau, and Kerguelen Gaussberg Plateau; strong meridional transport to the east of the Drake Passage; and anomalies to the south (wave troughs) and to the north (wave ridges) of the main circumpolar current over ocean basins and mountain ridges, respectively. It was shown that the Eltanin and Udintsev fracture zones in the vicinity of 135[degrees]W are important factors in directing the ACC eastward across the Southeast Pacific Basin to the Drake Passage. The estimated volume transports through the Drake Passage based on the model results are in fair agreement with oceanic observations. Estimates of the spin-up time of the system for homogeneous and stratified cases have been provided. 28 refs., 21 figs., 1 tab.
- OSTI ID:
- 6718323
- Journal Information:
- Journal of Geophysical Research; (United States), Vol. 98:C2; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTARCTIC OCEAN
OCEANIC CIRCULATION
SIMULATION
BATHYMETRY
BIOGEOCHEMISTRY
CONTROL
CURRENTS
DISTANCE
GLOBAL ASPECTS
OCEANOGRAPHY
SHEAR
VARIATIONS
VOLUME
WIND
WIND LOADS
ZONES
CHEMISTRY
DYNAMIC LOADS
GEOCHEMISTRY
SEAS
SURFACE WATERS
540310* - Environment
Aquatic- Basic Studies- (1990-)
540110