An interdisciplinary cruise dedicated to understanding ocean eddies upstream of the Prince Edward Islands

Ansorge, I.J. and Froneman, P.W. and Lutjeharms, J.R.E. and Bernard, K.S. and Lange, L. and Lukáč, D. and Backburg, B. and Blake, J. and Bland, S. and Burls, N. and Davies-Coleman, M.T. and Gerber, R. and Gildenhuys, S. and Hayes-Foley, P. and Ludford, A. and Manzoni, T. and Robertson, E. and Southey, D. and Swart, S. and Van Rensburg, D. and Wynne, S. (2004) An interdisciplinary cruise dedicated to understanding ocean eddies upstream of the Prince Edward Islands. South African Journal of Science, 100 (7 & 8). pp. 319-322. ISSN 0038-2353




A detailed hydrographic and biological survey was carried out in the region of the South-West Indian Ridge during April 2004. Altimetry and hydrographic data have identified this region as an area of high flow variability. Hydrographic data revealed that here the Subantarctic Polar Front (SAF) and Antarctic Polar Front (APF) converge to form a highly intense frontal system. Water masses identified during the survey showed a distinct separation in properties between the northwestern and southeastern corners. In the north-west, water masses were distinctly Subantarctic (>8.5°C, salinity >34.2), suggesting that the SAF lay extremely far to the south. In the southeast corner water masses were typical of the Antarctic zone, showing a distinct subsurface temperature minimum of <2.5°C. Total integrated chl-a concentration during the survey ranged from 4.15 to 22.81 mg chl-a m[superscript (-2)], with the highest concentrations recorded at stations occupied in the frontal region. These data suggest that the region of the South-West Indian Ridge represents not only an area of elevated biological activity but also acts as a strong biogeographic barrier to the spatial distribution of zooplankton.

Item Type:Article
Additional Information:News & Views
Uncontrolled Keywords:hydrographic surveying; South-West Indian Ridge; Subantarctic Polar Front (SPF); Antarctic Polar Front (APF); water masses; zooplankton; temperature; oceanography; ocean eddies; Prince Edward Islands
Subjects:Y Unknown > Subjects to be assigned
Divisions:Research Institutes and Units > Southern Ocean Group
Faculty > Faculty of Science > Zoology & Entomology
ID Code:344
Deposited By: Mrs Eileen Shepherd
Deposited On:16 Oct 2006
Last Modified:06 Jan 2012 16:17
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