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| Atlantic continental shelf | |
|---|---|
| Name | Atlantic continental shelf |
| Caption | Continental shelf along the Atlantic |
| Location | Atlantic Ocean margins |
| Type | Continental shelf |
Atlantic continental shelf
The Atlantic continental shelf is the submerged extension of continental landmasses bordering the Atlantic Ocean, shaping coastal physiography and influencing marine processes. It links major coastal provinces and shelf seas, framing interactions among the North Atlantic Treaty Organization, the European Union, the United States, Canada, Brazil, Argentina, Ghana, Nigeria, Angola, South Africa, Iceland, United Kingdom, Ireland, Norway, Spain, Portugal, France, Belgium, Netherlands, Germany, Denmark, Sweden, Morocco, Mauritania, Senegal, Sierra Leone, Guinea, Cabo Verde, Bahamas, Cuba, Haiti, Dominican Republic, Venezuela, Colombia, Suriname, Guyana, Uruguay, Mexico, Panama, Chile, Greenland, Antigua and Barbuda, Barbados, Jamaica, Trinidad and Tobago and many coastal jurisdictions. The shelf modulates fisheries, hydrocarbon resources, and coastal hazards adjacent to regions such as the Gulf of Mexico, the Caribbean Sea, the North Sea, the Baltic Sea, the Mediterranean Sea, the Labrador Sea, the Gulf of Guinea, and the South Atlantic Ocean.
The shelf formed through processes tied to plate tectonics and continental rifting during episodes represented by the breakup of Pangaea, the opening of the Atlantic Ocean, and the evolution of the Mid-Atlantic Ridge. Crustal extension, passive margin development, and thermal subsidence influenced stratigraphy observed in basins adjacent to the Amazon River, the Mississippi River, the Hudson River, the St. Lawrence River, the Rhone River, and the Loire River. Glacial-interglacial sea-level cycles recorded by the Last Glacial Maximum and the Holocene shaped drowned river valleys (rias) and sediment wedges deposited by turbidites linked to events like the Storegga Slide and slope failures documented off Norway. Continental shelf architecture includes features comparable to those studied at the Grand Banks of Newfoundland, the Shetland Isles margins, and the Southeast US continental shelf, with sequences correlated using techniques pioneered by researchers affiliated with institutions like Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Lamont–Doherty Earth Observatory, Geological Survey of Canada, and the British Geological Survey.
The Atlantic shelf spans from the Arctic margins near Greenland and Svalbard to subantarctic influences off South Africa and Argentina, encompassing notable shelves such as the Grand Banks, the Scotian Shelf, the New England Seamounts flank, the Georges Bank, the Baltic Sea rim, and the Patagonian Shelf. Its width varies from narrow margins off Norway and Chile to broad expanses off Brazil and the Gulf of Mexico; jurisdictional extents are governed by instruments like the United Nations Convention on the Law of the Sea administered by the International Maritime Organization and adjudicated in cases before the International Court of Justice. Coastal cities and ports including New York City, Boston, Halifax, Nova Scotia, Lisbon, Barcelona, Dublin, Cape Town, Rio de Janeiro, Lagos, Accra, Abidjan, Bergen, Reykjavik, Las Palmas, Freetown, Monrovia, and Port of Spain derive economic and navigational benefits from shelf geography.
Circulation over the shelf is driven by large-scale currents such as the Gulf Stream, the North Atlantic Current, the Brazil Current, and the Benguela Current, and modulated by mesoscale features and coastal upwelling systems studied near Cape Verde, Cape Blanc, Cape Frio, and the Sandy Hook region. Tidal regimes vary from macrotidal settings in parts of the Bay of Fundy to microtidal coasts along Portugal and France; storm surge and wave climates are influenced by cyclones like Hurricane Katrina, Hurricane Sandy, and extratropical storms tracked by agencies such as the National Oceanic and Atmospheric Administration and the Met Office. Sediment dynamics record inputs from rivers including the Amazon River, Niger River, Mississippi River, Orinoco River, and Congo River; depositional environments host muds, sands, and gravels, with features like sandbanks, mudflats, barrier islands exemplified by Outer Banks, and submarine canyons such as those near the Hatteras Canyon and the Nantucket Shoals. Research methods draw on seismic reflection pioneered by teams at Schlumberger and coring programs coordinated by the Integrated Ocean Drilling Program.
Shelf ecosystems support productive food webs centered on plankton assemblages studied by researchers at Woods Hole Oceanographic Institution and Scripps Institution of Oceanography and commercially important species like Atlantic cod, haddock, hake, tuna, anchovy, sardine, lobster, shrimp, and oysters. Benthos includes communities associated with cold-water corals similar to those documented off Norway and kelp forests comparable to those near Brittany and South Africa; higher trophic levels include migratory cetaceans like humpback whale and blue whale, seabirds such as Atlantic puffin and gannet, and pinnipeds including harp seal. Marine protected areas and conservation programs relate to designations by organizations such as the International Union for Conservation of Nature and national agencies including the National Park Service and the Canadian Wildlife Service.
Human activities across the shelf encompass commercial fisheries managed under bodies like the Northwest Atlantic Fisheries Organization and the International Commission for the Conservation of Atlantic Tunas, offshore oil and gas development in basins such as those exploited by Shell, BP, Chevron, and TotalEnergies, and renewable energy projects including offshore wind farms operated by firms like Ørsted and Vattenfall. Shipping routes connecting ports like Rotterdam, Hamburg, New Orleans, Savannah, Georgia, Baltimore, Maryland, Santos, Brazil, and Buenos Aires traverse shelf waters; strategic military operations by the North Atlantic Treaty Organization and national navies also rely on shelf bathymetry. Cultural and archaeological resources include submerged heritage linked to voyages of Christopher Columbus and wrecks studied by institutions such as the Smithsonian Institution and National Oceanography Centre.
Environmental pressures include overfishing highlighted in reports by the Food and Agriculture Organization, hydrocarbon pollution incidents like the Deepwater Horizon oil spill, plastic pollution addressed by initiatives from the United Nations Environment Programme, coastal eutrophication in regions monitored by the European Environment Agency, and climate-driven changes such as ocean warming, acidification, and sea-level rise emphasized in assessments by the Intergovernmental Panel on Climate Change. Conservation responses combine marine spatial planning, fisheries management exemplified by Magdalena Bay closures, designation of marine protected areas under national law and international agreements like the Convention on Biological Diversity, and remediation projects funded by institutions including the World Bank and the Global Environment Facility.