Benguela Current

The Benguela Current occupies the eastern side of the South Atlantic subtropical circulation, flowing generally northward along the southwestern African coast. The broader Benguela region extends from waters off South Africa past Namibia toward Angola, but it is not a single uniform stream. Its circulation includes offshore flow, coastal currents, upwelling-related jets and subsurface flows, and it is influenced by warm waters from the north and by leakage from the Agulhas system in the south.

Prevailing southerly and south-easterly winds help drive surface water away from parts of the coast. Cooler, nutrient-bearing water from below then rises to replace it. The supply of nutrients encourages phytoplankton growth, supporting food webs that include zooplankton, small pelagic fish, seabirds and marine mammals. Upwelling strength and biological response vary with wind conditions, location and season; the Lüderitz region of Namibia is a major upwelling centre.

The Benguela supports valuable fisheries and high marine productivity, but its ecological conditions can change markedly. Wind shifts, ocean circulation and climate variability can alter water temperature, upwelling, oxygen availability and the distribution of plankton and fish. Scientists distinguish northern and southern parts of the system because their circulation and ecosystem dynamics differ. Long-term climate projections for eastern boundary upwelling systems remain uncertain, with outcomes dependent on interacting changes in winds, stratification and the properties of source waters.

The cool current and coastal upwelling are associated with arid conditions along adjacent southwestern African coasts, including the Namib region. The waters also support conservation areas and wildlife colonies. Fisheries management and ecosystem monitoring must account for the system's natural variability as well as pressures such as fishing and environmental change.