Northeast Atlantic

Northeast Atlantic. The Northeast Atlantic is a major marine region of the Atlantic Ocean, extending from the southern tip of Greenland and the Strait of Gibraltar in the south, northward to the Arctic Circle. It is bordered by the coastlines of Western Europe and Northwest Africa, encompassing several marginal seas and a complex underwater topography. This region is of immense ecological and economic significance, supporting rich fisheries, major shipping routes, and diverse marine habitats from shallow coastal shelves to the deep abyssal plain.

Geography and boundaries

The region's boundaries are formally defined by the OSPAR Commission for conservation purposes, stretching from the Barents Sea opening in the north to the Gulf of Cádiz near the Strait of Gibraltar. Its eastern limit is the continental coastline of nations like Norway, the United Kingdom, and Portugal, while its western boundary extends into the open Atlantic Ocean. Major constituent seas include the North Sea, the Celtic Sea, the Irish Sea, the English Channel, the Bay of Biscay, and the Norwegian Sea. Key underwater features are the extensive European continental shelf, the deep Rockall Trough, the Mid-Atlantic Ridge, and the Porcupine Abyssal Plain. Notable archipelagos within its domain are the British Isles, Iceland, the Faroe Islands, and the Macaronesian islands of the Azores, Madeira, and the Canary Islands.

Oceanography and climate

The oceanography is dominated by the northward flow of warm, saline water from the Gulf Stream and its extension, the North Atlantic Current. This system moderates the climate of adjacent lands, giving Western Europe a milder climate than other regions at similar latitudes. The meeting of these warm waters with colder currents from the Arctic Ocean, such as the East Greenland Current, creates rich frontal zones like the Iceland-Faroe Front. Deep-water formation occurs in the Greenland Sea and the Labrador Sea, driving the global thermohaline circulation. Surface conditions are influenced by the North Atlantic Oscillation, which affects storm tracks, sea surface temperatures, and biological productivity. Tidal ranges are extreme in areas like the Bay of Fundy and the English Channel.

Marine ecosystems and biodiversity

The region hosts a wide variety of ecosystems due to its latitudinal range and varied bathymetry. The shallow, nutrient-rich shelves of the North Sea and Grand Banks of Newfoundland support some of the world's most productive fishing grounds. Cold-water coral reefs, such as those in the Darwin Mounds and the Sula Ridge, and deep-sea sponge aggregations provide critical habitat. Iconic marine mammals include the humpback whale, fin whale, harbor porpoise, and gray seal. Commercially vital fish species are Atlantic cod, Atlantic herring, mackerel, and blue whiting. The area is also a crucial migratory route for species like the European eel and various seabirds, including the northern gannet and Atlantic puffin.

Human activities and economic importance

The Northeast Atlantic has been a cornerstone of human activity for centuries. It is a primary zone for commercial fisheries managed by bodies like the North-East Atlantic Fisheries Commission. Major ports such as Rotterdam, Hamburg, Antwerp, and Felixstowe handle vast container shipping and trade along routes like those crossing the English Channel. Offshore industries are significant, with extensive oil and gas extraction in the North Sea led by nations like the United Kingdom and Norway, and growing developments in offshore wind power, particularly in the German Bight. The region is also vital for submarine telecommunications cables, naval operations by NATO members, and scientific research conducted by institutions like the National Oceanography Centre and the Marine Institute.

Environmental issues and conservation

The marine environment faces multiple pressures, including historical overfishing of stocks like Atlantic cod, which led to the collapse of the Newfoundland cod fishery. Pollution from agricultural runoff, industrial waste, and plastic debris is a persistent issue. The OSPAR Commission is the principal mechanism for international cooperation on protecting the marine environment, having established a network of Marine Protected Areas. Climate change impacts are pronounced, with documented shifts in species distributions, ocean acidification, and warming waters affecting ecosystems. Conservation efforts focus on restoring fish stocks through the European Union's Common Fisheries Policy, mitigating bycatch, and protecting vulnerable marine ecosystems from the impacts of bottom trawling and deep-sea mining interests.

Category:Atlantic Ocean Category:Regions of the Atlantic Ocean Category:Marine ecoregions