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Browsing by Author "Lutjeharms, J R E"

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A review of migratory behaviour of sea turtles off southerneastern Africa

Author: Luschi, P ; Lutjeharms, J R E ; Lambardi, P ; Mencacci, R ; Hughes, G R ; Hays, G C Date: 2006 The survival of sea turtles is threatened by modern fishing methods, exploitation of eggs and habitat destruction. Forming keystone species in the ocean, their extinction would disrupt the marine food chain in ways as yet unknown. The Indian ... Read more
A review of South African research in atmospheric science and physical oceanography during 2000-2005

Author: Reason, C J C ; Engelbrecht, F ; Landman, W ; Lutjeharms, J R E ; Piketh, S ; Rautenbach, C J W ; Hewitson, B C Date: 2006 The purpose of this article is to review progress in the fields of atmospheric science and physical oceanography made by workers based at South African institutions over approximately the last 5 years. Research published by South African ... Read more
Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela

Author: Roy, C ; van der Lingen, C D ; Coetzee, J C ; Lutjeharms, J R E Date: 2007 Cape anchovy Engraulis encrasicolus spawners in the southern Benguela showed an eastward shift in their distribution on the Agulhas Bank that occurred abruptly in 1996 and has since persisted. We assessed whether this shift was environmentally ... Read more
An interdisciplinary cruise dedicated to understanding ocean eddies upstream of the Prince Edward Islands

Author: Ansorge, I J ; Froneman, P W ; Lutjeharms, J R E ; Bernard, K ; Bernard, A ; Lange, L ; Lukác, D ; Backeburg, B ; Blake, J ; Bland, S ; Burls, N ; Davies-Coleman, M ; Gerber, R ; Gildenhuys, S ; Hayes-Foley, P ; Ludford, A ; Manzoni, T ; Robertson, E ; Southey, D ; Swart, S ; Van Rensburg, D ; Wynne, S Date: 2004 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 ... Read more
Estimation of sea-surface temperature around southern Africa from satellite-derived microwave observations

Author: Rouault, M ; Lutjeharms, J R E Date: 2003 Sea-surface temperatures may give strong indications of the location of fronts, currents, eddies and other components of ocean circulation. This has been recognized in particular for the seas around southern Africa. Almost all studies using ... Read more
Interaction of Agulhas filaments with mesoscale turbulence: a case study

Author: Whittle, C P ; Lutjeharms, J R E ; Duncombe Rae, C M ; Shillington, F A Date: 2008 The inter-ocean leakage of heat and salt from the South Indian Ocean to the South Atlantic has important consequences for the global thermohaline circulation and in particular for the strength of overturning of the Atlantic Ocean as a whole. ... Read more
Intrusions of sub-Antarctic water across the Subtropical Convergence south of Africa

Author: Lutjeharms, J R E ; Fillis, C Date: 2003 The contents of the Cape Basin of the South Atlantic Ocean, southwest of Cape Town, is a melange of water types from a number of different sources. One of the least studied of these water types comes from intrusions of sub-Antarctic water ... Read more
Monitoring the oceanic flow between Africa and Antarctica: Report of the first GoodHope cruise

Author: Ansorge, I J ; Speich, S ; Lutjeharms, J R E ; Goni, G J ; Rautenbach, C J de W ; Froneman, P W ; Rouault, M ; Garzoli, S L Date: 2005 The southern ocean plays a major role in the global oceanic circulation role in the global oceanic circulation, as a component of the Meridional Overturning Circulation, and it is postulated that it has a great influence on present-day climate. ... Read more
Ocean currents south of Africa from drifters

Author: Durgadoo, J V ; Ansorge, I J ; Lutjeharms, J R E Date: 2008 The ocean currents and their variability south of Africa are known to cover a wide spectrum, spatially and possibly temporally. Hydrographic observations in this vast ocean region are logistically demanding and expensive. In recent years the ... Read more
Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean

Author: Ansorge, I J ; Froneman, P W ; Richoux, N ; Blake, J ; Daly, R ; Sterley, J ; Hart, N ; Mostert, B ; Heyns, E ; Sheppard, J ; Kuyper, B ; George, C ; Howard, J ; Mustafa, E ; Pey, F ; Lutjeharms, J R E Date: 2007 A detailed hydrographic and biological survey was conducted in the region of the Subtropical Convergence in the Indian sector of the Southern Ocean in April 2007. Hydrographic data revealed that the subsurface expression of the Subtropical ... Read more c b
Sea-surface temperatures at the sub-Antarctic islands Marion and Gough during the past 50 years

Author: Mélice, J-L ; Lutjeharms, J R E ; Rouault, M ; Ansorge, I J Date: 2003 Sea-surface temperatures (SSTs) have been measured at Marion and Gough islands for nearly 50 years. These are some of the longest records of their kind in the sub-Antarctic. We present the trend, the seasonal cycle, and the time-frequency ... Read more
The ocean environment off southeastern Africa: A review

Author: Lutjeharms, J R E Date: 2006 The ocean environment off southeastern Africa consists of a continental shelf region of diverse widths and an off-shelf circulation that is similarly multifaceted. These factors lead to a complex and as yet imperfectly understood coastal and ... Read more