This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Continental Shelf (Atlantic Ocean) | |
|---|---|
| Name | Continental Shelf (Atlantic Ocean) |
| Caption | Continental margin regions of the Atlantic Ocean |
| Location | Atlantic Ocean |
| Type | Continental shelf |
| Area | Variable by definition and jurisdiction |
| Max-depth | Shallow relative to abyssal plains |
Continental Shelf (Atlantic Ocean) The continental shelf of the Atlantic Ocean is the broad, shallow submerged margin that borders the continents of North America, South America, Europe, Africa, and Antarctica; it includes principal features such as the Grand Banks of Newfoundland, the Patagonian Shelf, the Faroes–Shetland Channel approaches, and the West African continental shelf. The shelf regulates interactions among regional systems like the Gulf Stream, the Benguela Current, the North Atlantic Current, and the South Atlantic Current and supports major ports including New York City, Rio de Janeiro, Lisbon, Dakar, and Cape Town through fisheries, hydrocarbon extraction, and navigation. Its study involves institutions such as the National Oceanic and Atmospheric Administration, the British Geological Survey, the Centro de Investigaciones Científicas y Técnicas de la Armada, and the Lamont–Doherty Earth Observatory.
The Atlantic continental shelf varies widely: the broad, shallow expanse of the Grand Banks of Newfoundland and the Patagonian Shelf contrasts with narrow shelves off Norway and Mauritania; shelf width and slope are mapped by agencies like the United States Geological Survey, the EEA member states' hydrographic services, and the International Hydrographic Organization. Major marginal basins and seams include the Labrador Sea margins, the Sargasso Sea periphery, the Porcupine Bank, the Celtic Shelf, the Amazon Cone region, and the Northeast Brazilian Shelf, which connect to deeper features like the Mid-Atlantic Ridge and abyssal plains. The shelf's outer edge—the shelf break—often aligns with submarine canyons such as the Baltimore Canyon and the Zaire Canyon, which control sediment exchange with continental slopes off coasts like Florida, Argentina, Iberia, Senegal, and Namibia.
Atlantic shelves reflect the tectonic history of the Atlantic Ocean since the breakup of Pangaea and the opening at the Mid-Atlantic Ridge, with passive margins along the East Coast of the United States and the West African coast and active tectonic influences near the Caribbean Plate and the South Sandwich Islands. Sedimentary sequences on shelves derive from sources including the Amazon River, the Gulf of Mexico drainage, and glacial inputs from Laurentide Ice Sheet legacy deposits such as those forming the Grand Banks. Stratigraphic frameworks are interpreted through seismic reflection surveys by organizations like Schlumberger and national geological surveys, revealing features such as prograding clinoforms, shelf-edge deltas, and buried paleochannels tied to sea-level changes during the Last Glacial Maximum and the Holocene transgression.
Shelf hydrography is modulated by currents—Gulf Stream, North Brazil Current, Canary Current, Agulhas Current—and by seasonal phenomena like North Atlantic Oscillation variability and seasonal upwelling off Benguela and Mauritania; these create nutrient regimes that sustain ecosystems from plankton to apex predators including Atlantic cod stocks historically exploited by fleets from England, France, and Portugal. Biogeographic zones contain habitats such as kelp forests off Iceland, seagrass beds in the Gulf of Mexico, cold-water coral mounds near the Porcupine Seabight, and benthic communities on the Patagonian Shelf that support fisheries for hake, sardine, and shrimp. Research by institutions including the Woods Hole Oceanographic Institution, the Scripps Institution of Oceanography, and the Ifremer informs management of ecosystem services and biodiversity hotspots.
Atlantic shelves host hydrocarbons in basins like the Gulf of Mexico, the Niger Delta, the Campos Basin, and the North Sea, developed by operators such as Shell, BP, Petrobras, and Equinor; continental shelves also yield mineral deposits including phosphorite on the Mauritanian shelf, manganese nodules approaching slope regions, and sand/gravel for construction near ports like Rotterdam and New York City. Fisheries for Capelin, Atlantic herring, cod, anchovy, and squid underpin economies of Greenland, Norway, Iceland, Peru (via Atlantic-influenced stocks), and coastal states of West Africa and South America and are regulated through regional bodies such as the International Commission for the Conservation of Atlantic Tunas and the Northwest Atlantic Fisheries Organization.
Sovereign rights over continental shelves are governed by the United Nations Convention on the Law of the Sea (UNCLOS) provisions on continental shelf claims and exclusive economic zones (EEZs), with submissions adjudicated at bodies like the Commission on the Limits of the Continental Shelf; notable delimitation cases include disputes settled by the International Court of Justice and arbitration between Argentina and Chile, and boundary delimitation agreements like those involving Mauritania and Senegal or United Kingdom and Ireland. States such as United States, Brazil, Norway, and United Kingdom maintain hydrographic and geological programs to substantiate claims beyond 200 nautical miles under Article 76 of UNCLOS.
Environmental pressures include overfishing exemplified by Cod Wars-era collapses and modern stock declines, oil spills such as incidents impacting Gulf of Mexico ecosystems, habitat degradation from bottom trawling affecting areas like the Porcupine Bank, and pollution inputs linked to shipping lanes near Strait of Gibraltar and English Channel. Conservation responses involve marine protected areas designated by entities like the European Union under Natura 2000, national marine reserves in South Africa and Brazil, regional fisheries management by NAFO and ICES, and NGO campaigns by Greenpeace and WWF addressing biodiversity loss and climate-driven shifts in species distributions.
Survey and monitoring employ multibeam echosounders, seismic reflection profiling by research vessels of institutions such as the RRS James Cook and the RV Knorr, remote sensing from satellites like Landsat and Sentinel, autonomous platforms used by Woods Hole Oceanographic Institution and Scripps Institution of Oceanography, and biological sampling coordinated through programs like the Census of Marine Life and the International Polar Year initiatives. Geological sampling uses cores analyzed at centers like the British Geological Survey and the Lamont–Doherty Earth Observatory, while legal submissions rely on bathymetric and sedimentary data reviewed by the Commission on the Limits of the Continental Shelf.
Category:Atlantic Ocean Category:Continental shelves