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Effects of deep-sea eddies on the northern KwaZulu-Natal shelf, South Africa

Effects of deep-sea eddies on the northern KwaZulu-Natal shelf, South Africa This paper describes the westward movement of a cyclonic eddy across the Mozambique Channel and the subsequent south-westward propagation of the eddy along the east coast of South Africa and its interaction with the shelf. A hydrographic survey on 13 September 2006 off Nine-mile Reef (NMR), Sodwana Bay, showed a well-developed Agulhas Current along the continental shelf inshore of a cyclonic eddy flanked by two anti-cyclonic eddies, further offshore. A satellite-tracked drifter and complementary altimetry data confirmed the dimensions of the eddy and tracked its movement towards the coast. Shelf-edge upwelling was measured at NMR by an underwater temperature recorder (UTR) when the cyclonic eddy first came into contact with the shelf and again when the cyclonic eddy interacted with the leading edge of the anti-cyclonic eddy moving onto the shelf. Further shelf–eddy interactions off Aliwal Shoal, south of Durban, and consequent upwelling were similarly caused by the same cyclonic eddy as it progressed south-westward along the east coast. Analysis of UTR data between 2004 and 2006 indicated that between two and five cyclonic eddies impact the shelf off NMR per year. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png African Journal of Marine Science Taylor & Francis

Effects of deep-sea eddies on the northern KwaZulu-Natal shelf, South Africa

Morris, T; Lamont, T; Roberts, M J
African Journal of Marine Science , Volume 35 (3): 8 – Sep 1, 2013
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Effects of deep-sea eddies on the northern KwaZulu-Natal shelf, South Africa

Abstract

This paper describes the westward movement of a cyclonic eddy across the Mozambique Channel and the subsequent south-westward propagation of the eddy along the east coast of South Africa and its interaction with the shelf. A hydrographic survey on 13 September 2006 off Nine-mile Reef (NMR), Sodwana Bay, showed a well-developed Agulhas Current along the continental shelf inshore of a cyclonic eddy flanked by two anti-cyclonic eddies, further offshore. A satellite-tracked drifter and...
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Publisher
Taylor & Francis
Copyright
Copyright © NISC (Pty) Ltd
ISSN
1814-2338
eISSN
1814-232X
DOI
10.2989/1814232X.2013.827991
Publisher site
See Article on Publisher Site

Abstract

This paper describes the westward movement of a cyclonic eddy across the Mozambique Channel and the subsequent south-westward propagation of the eddy along the east coast of South Africa and its interaction with the shelf. A hydrographic survey on 13 September 2006 off Nine-mile Reef (NMR), Sodwana Bay, showed a well-developed Agulhas Current along the continental shelf inshore of a cyclonic eddy flanked by two anti-cyclonic eddies, further offshore. A satellite-tracked drifter and complementary altimetry data confirmed the dimensions of the eddy and tracked its movement towards the coast. Shelf-edge upwelling was measured at NMR by an underwater temperature recorder (UTR) when the cyclonic eddy first came into contact with the shelf and again when the cyclonic eddy interacted with the leading edge of the anti-cyclonic eddy moving onto the shelf. Further shelf–eddy interactions off Aliwal Shoal, south of Durban, and consequent upwelling were similarly caused by the same cyclonic eddy as it progressed south-westward along the east coast. Analysis of UTR data between 2004 and 2006 indicated that between two and five cyclonic eddies impact the shelf off NMR per year.

Journal

African Journal of Marine Science – Taylor & Francis

Published: Sep 1, 2013

Keywords: Aliwal Shoal; east coast South Africa; mesoscale eddies; Nine-mile Reef; shelf interactions; upwelling

References

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  • An eddy over the Northern Mozambique Ridge
  • Cyclogenesis in the Mozambique Ridge Current
  • Anatomy of a cyclonic eddy of the Mozambique Ridge Current
  • Review of cyclonic eddies of the Moçambique Ridge Current
  • Two contra-rotating eddies of the Mozambique Ridge Current
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  • St. Helena Bay (southern Benguela) then and now: muted climate signals, large human impact
  • Circulation patterns in the Delagoa Bight, Mozambique, and the influence of deep ocean eddies
  • Physical oceanography of Sodwana Bay and its effect on larval transport and coral bleaching
  • Eddies in the southern Mozambique Channel
  • Shelf currents, lee-trapped and transient eddies on the inshore boundary of the Agulhas Current, South Africa: their relevance to the KwaZulu-Natal sardine run
  • Oceanographic environment of the Sodwana Bay coelacanths (Latimeria chalumnae), South Africa
  • New perspectives on Natal Pulses from satellite observations
  • Ocean Data View