Agulhas Return Current

The Agulhas Return Current (ARC) is an ocean current in the South Indian Ocean. The ARC contributes to the water exchange between oceans by forming a link between the South Atlantic Current and the South Indian Ocean Current.^[1] It can reach velocities of up to 4 knots (7.4 km/h; 4.6 mph) and is therefore popular among participants in trans-oceanic sailing races.^[2]

Oceanography

The ARC originates from the

Subtropical Front, roughly around 39°S, north of the Antarctic Circumpolar Current.^[2]

The Agulhas Current follows the continental shelf of the African east-coast, pass through the

South Atlantic.^[3]

The water mass loses a lot of heat at the Agulhas Retroflection, up to 200 W/m³ (0.0076 hp/cu ft), 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 110–75 cm/s (43–30 in/s) 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

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]