surface usually covered with sea ice in Labrador Sea, Denmark Strait, and coastal portions of the Baltic Sea from October to June; surface dominated by two large gyres (broad, circular systems of currents), one in the northern Atlantic and another in the southern Atlantic; the ocean floor is dominated by the Mid-Atlantic Ridge, a rugged north-south centerline for the entire Atlantic basin
major surface currents: clockwise North Atlantic Gyre consists of the northward flowing, warm Gulf Stream in the west, the eastward flowing North Atlantic Current in the north, the southward flowing cold Canary Current in the east, and the westward flowing North Equatorial Current in the south; the counterclockwise South Atlantic Gyre composed of the southward flowing warm Brazil Current in the west, the eastward flowing South Atlantic Current in the south, the northward flowing cold Benguela Current in the east, and the westward flowing South Equatorial Current in the north
" }, "Ocean volume": { "ocean volume": { "text": "310,410,900 cu km" }, "percent of World Ocean total volume": { "text": "23.3%" } }, "Elevation": { "highest point": { "text": "sea level" }, "lowest point": { "text": "Puerto Rico Trench -8,605 m" }, "mean depth": { "text": "-3,646 m" }, "ocean zones": { "text": "Composed of water and in a fluid state, the oceans are delimited differently than the solid continents. Oceans are divided into three zones based on depth and light level. Although some sea creatures depend on light to live, others can do without it. Sunlight entering the water may travel about 1,000 m into the oceans under the right conditions, but there is rarely any significant light beyond 200 m.the Atlantic Ocean fisheries are the second most important in the world accounting for 26.4%, or 21,063,495 mt, of the global catch in 2019; of the seven regions delineated by the Food and Agriculture Organization in the Atlantic basin, the most important include the following:
Northeast Atlantic region (Region 27) is the fourth most important in the world producing 10.2% of the global catch or 8,116,507 mt in 2019; the region encompasses the waters north of 36º North latitude and east of 40º West longitude with the major producers including Norway (3,528,240 mt), Russia (1,044,153 mt), Iceland (933,019 mt), UK (823,669 mt), and Denmark (641,927 mt); the region includes the historically important fishing grounds of the North Sea, the Baltic Sea, and the Atlantic waters between Greenland, Iceland, and the British Isles; the principal catches include Atlantic cod, haddock, saithe (pollock), Blue Whiting, herring, and mackerel; not all fish caught are for human consumption, half of fish catches in the North Sea are processed as fish oil or fish meal, which are used in animal fodder
Eastern Central Atlantic region (Region 34) is the second most important Atlantic fishery, and sixth largest in the world producing more than 6.8% of the global catch or 5,397,726 mt in 2019; the region encompasses the waters between 36º North and 6º South latitude and east of 40º West longitude off the west coast of Africa with the major producers including Morocco (1,419,872 mt), Mauritania (705,850 mt), Senegal (472,571 mt), Nigeria (451,768 mt), Ghana (303,001 mt), Cameroon (265,969 mt), and Sierra Leone (200,000 mt); the principal catches include pilchard, sardinellas, shad, and mackerel
Northwest Atlantic region (Region 21) is the third most important Atlantic fishery and eighth in the world producing 2% of the global catch and 1,679,512 mt in 2019; it encompasses the waters north of 35º North latitude and west of 42º West longitude including the important fishing grounds over the continental shelf of North America such as the Grand Banks, the Georges Bank, and the Flemish Cap, as well as Baffin Bay with the major producers including the US (927,777 mt), Canada (615,651 mt), and Greenland (179,990 mt); the principal catches include sea scallops, prawns, lobster, herring, and menhaden
Mediterranean and Black Sea region (Region 37) is a minor fishing region representing 1.7% or 1,385,190 mt of the world’s total capture in 2019; the region encompasses all waters east of the Strait of Gibraltar with the major producers including Turkey (686,650 mt), Italy (281,212 mt), Tunisia (129,325 mt), Spain (119,759 mt), and Russia (72,279 mt); the principal catches include European anchovy, European pilchard, Gobies, and clams
Regional fisheries bodies: Commission for the Conservation of Southern Bluefin Tuna, Fishery Committee for the Eastern Central Atlantic, Fisheries Committee for the West Central Gulf of Guinea, General Fisheries Commission for the Mediterranean, International Commission for the Conservation of Atlantic Tunas, International Council for the Exploration of the Seas, Northwest Atlantic Fisheries Organization, North Atlantic Salmon Conservation Organization, North East Atlantic Fisheries Commission, Southeast Atlantic Fisheries Organization, Western Central Atlantic Fishery Commission
the International Maritime Bureau reports the territorial and offshore waters in the Niger Delta and Gulf of Guinea remain a very high risk for piracy and armed robbery of ships; in 2021, there were 34 reported incidents of piracy and armed robbery at sea in the Gulf of Guinea region; although a significant decrease from the total number of 81 incidents in 2020, it included the one hijacking and three of five ships fired upon worldwide; while boarding and attempted boarding to steal valuables from ships and crews are the most common types of incidents, almost a third of all incidents involve a hijacking and/or kidnapping; in 2021, 57 crew members were kidnapped in seven separate incidents in the Gulf of Guinea, representing 100% of kidnappings worldwide; Nigerian pirates in particular are well armed and very aggressive, operating as far as 200 nm offshore; the Maritime Administration of the US Department of Transportation has issued a Maritime Advisory (2022-001 - Gulf of Guinea-Piracy/Armed Robbery/Kidnapping for Ransom) effective 4 January 2022, which states in part, \"Piracy, armed robbery, and kidnapping for ransom continue to serve as significant threats to US-flagged vessels transiting or operating in the Gulf of Guinea;” South American ports in Brazil and Colombia, as well as Caribbean ports in Mexico and Haiti continue to be affected by the crime of armed robbery against ships with 15 incidents reported in 2021 compared to 17 in 2020 with most of these occurring while berthed or anchored
" } }, "Transnational Issues": { "Disputes - international": { "text": "some maritime disputes (see littoral states)
" } } }