Cape Verde Rise

Cape Verde Rise
Name	Cape Verde Rise
Type	Submarine rise
Location	North Atlantic Ocean

Cape Verde Rise The Cape Verde Rise is a broad bathymetric high in the eastern North Atlantic Ocean near the Cape Verde Islands, forming a topographic swell between the Iberian Peninsula–European continental margin and the West African coast. It influences regional Atlantic Ocean circulation, North Atlantic Current patterns, and sediment dispersal for adjacent margins including the Gulf of Guinea and the Iberian Abyssal Plain. The rise is a focal area for multidisciplinary studies by institutions such as the National Oceanic and Atmospheric Administration, the Woods Hole Oceanographic Institution, and the Institut français de recherche pour l'exploitation de la mer.

Geography and Location

The rise lies seaward of the Cape Verde Plateau and east of the Mid-Atlantic Ridge arrondissement near the volcanic archipelago of Cape Verde and bisects the western approaches to the Canary Basin and the Sierra Leone Rise. Its position affects passage routes used historically by vessels between Lisbon and Luanda and modern shipping lanes connecting European Union ports with West Africa and transatlantic links to Brazil. Neighboring physiographic features include the Azores physiographic province, the Senegalese continental slope, the Mauritanian margin, and the Cabo Verde Rise seamount province. Administrative and scientific mapping references cite the area in charts produced by the International Hydrographic Organization and the United Nations Convention on the Law of the Sea when delimiting maritime zones near São Vicente (Cape Verde).

Geology and Formation

The rise is underlain by altered oceanic crust and thickened sedimentary sequences deposited since the Cretaceous after the opening of the North Atlantic Ocean basin following the breakup of Pangea. Plate reconstructions linking the African Plate and the Eurasian Plate during the Mesozoic and Cenozoic explain subsidence and uplift phases evident in seismic profiles produced by research vessels from Lamont–Doherty Earth Observatory, GEOMAR Helmholtz Centre for Ocean Research Kiel, and the Bureau of Ocean Energy Management. The rise shows evidence of hotspot interaction attributed in some models to mantle plumes related to the Canary hotspot or migrating sources connected to the Azores hotspot and the Cape Verde hotspot track, similar to processes invoked for Iceland and Hawaii. Continental fragment capture, intraplate stresses tied to the Alboran Sea domain, and salt tectonics analogous to the Gabon and Angola margins have been proposed to account for variations in stratigraphy and crustal thickness.

Oceanography and Bathymetry

Regional bathymetry reveals the rise as a broad swell with summit elevations rising several hundred meters above surrounding abyssal plains such as the Porto Seamounts and the Sierra Leone Abyssal Plain. Its morphology modulates the flow of the North Equatorial Current, the Canary Current, and teleconnected features of the Atlantic Meridional Overturning Circulation. Mesoscale eddies, anticyclonic rings, and internal tides are generated or steered by the rise, affecting nutrient fluxes studied by teams from National Oceanography Centre, Scripps Institution of Oceanography, and Ifremer. Hydrographic sections crossing the rise document anomalies in temperature and salinity in water masses like Labrador Sea Water and Mediterranean Water, and show impacts on primary productivity patterns observed by European Space Agency and NASA remote sensing missions aboard ENVISAT and MODIS instruments.

Tectonic and Volcanic Activity

Seismicity in the region includes intraplate earthquakes recorded by networks operated by International Seismological Centre and national agencies such as the Instituto Português do Mar e da Atmosfera and the Instituto Hidrográfico of Portugal. Focal mechanisms reflect complex stress regimes influenced by African–Eurasian convergence and transform faulting related to the Charlie–Gibbs fracture zone and nearby fracture systems. Volcanic edifices on the rise and adjacent seamount chains bear morphological resemblance to Fogo (Cape Verde) and Santiago (Cape Verde), suggesting a shared magmatic heritage with the Cape Verde archipelago; dredge samples analyzed at British Geological Survey and Universidade de Lisboa laboratories show alkali basalt compositions akin to other Ocean Island Basalt occurrences cataloged from Ascension Island and the Azores. Geophysical surveys employing multichannel seismic, gravity, and magnetic data from RV Polarstern and RV Knorr have constrained crustal thickness and revealed volcanic intrusions and sedimentary depocenters.

Marine Ecology and Biodiversity

The rise creates ecological niches supporting benthic communities, deep-sea corals, and sponge fields documented by submersible and ROV expeditions conducted by NOAA Ship Okeanos Explorer and the Alvin program operated by Woods Hole Oceanographic Institution and Monterey Bay Aquarium Research Institute. Associated faunal assemblages include demersal fishes exploited by fleets from Spain, Portugal, and Mauritania, marine mammals such as sperm whale and humpback whale migrating along the eastern Atlantic, and pelagic species like tuna and mahi-mahi tied to productivity fronts. Biodiversity assessments coordinated by the Convention on Biological Diversity and regional initiatives involving the African Union and United Nations Educational, Scientific and Cultural Organization emphasize the rise's role in connectivity between the Macaronesia biogeographic province and West African ecosystems.

Research History and Exploration

Scientific exploration accelerated in the mid-20th century with surveys by RRS Discovery and later multidisciplinary campaigns by RV Hesperides, RV Celtic Explorer, and others supported by agencies including the National Science Foundation, European Commission research programs such as Horizon 2020, and bilateral collaborations between Portugal and Cape Verde. Key contributions include geological mapping by the International Ocean Drilling Program and paleoceanographic cores analyzed at institutions like Geological Survey of Denmark and Greenland and University of Southampton. Recent projects integrate autonomous platforms, satellite altimetry from TOPEX/Poseidon and Jason missions, and genetic barcoding coordinated by the Barcode of Life initiative. Ongoing research priorities feature climate-driven changes in circulation, seafloor mineral resource assessments scrutinized by the International Seabed Authority, and conservation planning involving regional governments and nongovernmental organizations such as WWF.

Category:Underwater ridges of the Atlantic Ocean