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Comparisons between surface, barotropic and abyssal flows during the passage of a warm-core ring

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Mulhearn, PJ, Filloux, JH, Bindoff, NL and Ferguson, IJ 1988 , 'Comparisons between surface, barotropic and abyssal flows during the passage of a warm-core ring' , Australian Journal of Marine and Freshwater Research, vol. 39, no. 6 , pp. 697-707 , doi: 10.1071/MF9880697.

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Abstract

A comparison is made of results for barotropic, surface and abyssal flows during the formation and passage of a warm-core ring in the East Australian Current. The barotropic velocities are estimated from sea-floor measurements of the horizontal electric field, which is induced by water motion. Values for the surface and near-bottom velocities are obtained generally by more traditional methods. A strong similarity is observed between the directions of the barotropic and surface flows. At a site close to the foot of the continental slope, the barotropic and near-bottom velocities are also similar, both in direction and magnitude. A possible explanation for this effect is that proximity to the coast constrains flow directions and causes the streamlines at depth to converge on the western (or near-shore) side of the warm-core ring.
The determination of barotropic velocities enables barotropic volume transports to be estimated and compared with traditional geostrophic volume transports calculated for water motion between the surface and a depth of 1300 m. The barotropic transports are found to be greater than the geostrophic transports by a factor of approximately 1.6, indicating the significance of deep-water flow in the East
Australian Current.

Item Type: Article
Authors/Creators:Mulhearn, PJ and Filloux, JH and Bindoff, NL and Ferguson, IJ
Journal or Publication Title: Australian Journal of Marine and Freshwater Research
ISSN: 1323-1650
DOI / ID Number: 10.1071/MF9880697
Additional Information:

© CSIRO 1988

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