The Agulhas Current follows the continental shelf of the African east-coast, pass through the Agulhas Passage until it leaves the Agulhas Bank and reaches the Agulhas Basin south of South Africa. From there it retroflects almost completely back into the south Indian Ocean as the ARC, and only a smaller part, known as Agulhas leakage, is shed into the South Atlantic.[3]
The water mass loses a lot of heat at the Agulhas Retroflection, up to Шаблон:Convert, while evaporation and precipitation change the composition of the upper layers. The ARC, therefore, has another composition than the Agulhas Current proper.[3] It also loses velocity from Шаблон:Convert and volume transport from 70 to 54 million m³/s. Furthermore, all traces of Indian Tropical Surface Water are gone.[4]
Having left the retroflection, the ARC meanders east between 36°S and 41°S.[5]
These meanders were described as Rossby waves in 1970[6] and are known to shed cold eddies equatorward and enhance the primary productivity at the Subtropical Front.[7]
The ARC makes a large, quasi-permanent northward meander around the Agulhas Plateau after which it loses more velocity and volume by leakage into the South Indian subtropical gyre. Over the Crozet Basin the last remnants of the ARC are gone.[4]
As it enters the Crozet Basin at 53°E, the transport of the ARC is 35 Sv, most of which is recirculated northward before reaching the Kerguelen-Amsterdam Passage.[8]
The current east of the Crozet Basin, at 66°E-70°E, is called the South Indian Ocean Current and lacks the distinctive features of the ARC.[4]
