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| North African Current | |
|---|---|
| Name | North African Current |
| Location | Eastern North Atlantic, western Mediterranean entrance |
| Type | Oceanic current |
| Source | Canary Current, North Atlantic Subtropical Gyre |
| Mouth | Iberian Peninsula, Strait of Gibraltar region |
| Countries | Morocco, Algeria, Tunisia, Spain, Portugal |
North African Current
The North African Current is a coastal and shelf-following ocean circulation feature off the northwest African and southwestern Iberian coasts that connects parts of the Canary Current system with flows toward the Strait of Gibraltar and the western Mediterranean Sea. It interacts with major features of the North Atlantic Ocean such as the Azores High, the Iberian Peninsula coastal upwelling, and the North Atlantic Subtropical Gyre, and plays a role in regional hydrography, climate, and maritime activities tied to ports like Tangier, Casablanca, Algiers, and Gibraltar. The current influences biogeographic boundaries relevant to researchers at institutions like the Scripps Institution of Oceanography, the Plymouth Marine Laboratory, and the Institute of Marine Research.
The North African Current is characterized by a narrow, wind-driven alongshore flow embedded in the eastern limb of the North Atlantic Current system and modulated by the Mediterranean Outflow Water pathway through the Strait of Gibraltar. Hydrographic surveys from vessels such as Calypso and research programs including the Global Ocean Observing System show cross-shelf temperature and salinity gradients tied to the Canary Current and mesoscale eddies comparable to features observed near Cape Verde and the Azores. The current's vertical shear and baroclinic structure relate to profiles measured by ARGO floats and autonomous gliders deployed by teams at the Woods Hole Oceanographic Institution and the National Oceanography Centre, Southampton. Interaction with shelf bathymetry near the Gulf of Cadiz, the Cape Spartel region, and the Riffian margin steers the flow and establishes fronts that affect acoustic propagation studied by the Office of Naval Research and the Naval Research Laboratory.
Formation of the North African Current arises from the basin-scale circulation of the North Atlantic Ocean including input from the Canary Current—itself part of the North Atlantic Subtropical Gyre—and wind forcing associated with the Azores High and the seasonal position of the Intertropical Convergence Zone. Ekman transport, alongshore pressure gradients identified in studies from the European Space Agency and the National Aeronautics and Space Administration, and thermohaline contributions from the Mediterranean Sea create the pressure-driven coastal jet. Mesoscale eddy shedding similar to processes at the Gulf Stream and interactions with the Iberian Poleward Current produce variability; satellite altimetry by missions like TOPEX/Poseidon, Jason-3, and Sentinel-3 has documented these dynamics.
Seasonal shifts in trade winds, the position of the Azores High, and the intensity of the West African Monsoon modulate the North African Current, producing summer upwelling off Morocco and winter poleward advection toward the Gulf of Cádiz. Interannual variability is tied to large-scale climate modes such as the Atlantic Multidecadal Oscillation, the North Atlantic Oscillation, and teleconnections with the El Niño–Southern Oscillation that also influence circulation features near the Canary Islands and Madeira. Long-term changes recorded by programs at the Plymouth Marine Laboratory, CNRS, and the Conseil Européen pour la Recherche indicate links to anthropogenic forcing assessed in assessments by the Intergovernmental Panel on Climate Change and regional analyses by the Mediterranean Action Plan.
By transporting heat, salt, nutrients, and planktonic organisms along the northwest African shelf, the current shapes ecological zones relevant to fisheries operating out of ports such as Agadir, Safi, Oran, and Bizerte. Upwelling associated with the current supports primary productivity that sustains stocks of sardine and anchovy exploited by fleets including those of Spain and Morocco, and informs management by bodies like the Food and Agriculture Organization. The current also influences air–sea interactions that affect regional climate patterns tied to the Iberian Peninsula and the southern Europe temperature regimes studied by the European Centre for Medium-Range Weather Forecasts and the Met Office. Biogeographic connectivity across the Alboran Sea into the Balearic region is documented by genetic studies at the Centre National de la Recherche Scientifique and by observational programs supported by the Mediterranean Science Commission.
The North African Current has navigational, commercial, and security implications for maritime traffic transiting the approaches to the Strait of Gibraltar, the Bay of Biscay corridors, and coastal trade routes between Lisbon, Cadiz, and Alexandria. Its influence on fisheries drives socioeconomic outcomes for communities in Tangier-Tetouan-Al Hoceima, Sous-Massa, and the Oran region, informing policies by national agencies such as the Institut National de Recherche Halieutique and international frameworks including the European Union fisheries regulations and the Barcelona Convention. Offshore renewable energy planning for wind farm and wave energy projects in the northeastern Atlantic references current climatologies produced by laboratories at Imperial College London and the Technical University of Denmark. Monitoring and modeling efforts by collaborations among the International Hydrographic Organization, the United Nations Environment Programme, and regional marine institutes continue to refine understanding of the current's role in navigation safety, resource management, and climate adaptation.
Category:Ocean currents of the Atlantic Ocean Category:Hydrology of Morocco Category:Hydrology of Algeria Category:Hydrology of Tunisia