Northwest Atlantic

Northwest Atlantic
Name	Northwest Atlantic
Location	Western North Atlantic Ocean
Type	Ocean region
Basin countries	Canada, United States
Cities	Halifax, Boston, New York City

Northwest Atlantic. The Northwest Atlantic is a major oceanic region of the North Atlantic Ocean, lying off the eastern coasts of North America. It is a critical area for global ocean circulation, rich marine fisheries, and significant maritime history. The region is bounded by the continental shelves and slopes from Labrador and Newfoundland south to the Cape Hatteras region, encompassing several iconic marine basins and currents.

Geography and boundaries

The region is geographically defined by the extensive North American continental shelf, which broadens significantly off Nova Scotia and New England to form the Grand Banks of Newfoundland and Georges Bank. Its western boundary is the coastline from the Strait of Belle Isle south past the Gulf of Maine to Cape Hatteras in North Carolina. The eastern boundary transitions to the deep ocean basin, often marked by the Mid-Atlantic Ridge. Major submarine features include the Laurentian Channel, the Scotian Shelf, and the Blake Plateau. The Gulf of St. Lawrence and the Bay of Fundy, with its record-breaking tides, are significant marginal seas within this area.

Oceanography and climate

The oceanography is dominated by the southward-flowing Labrador Current, which carries cold, fresh water from the Arctic, and the northward-flowing Gulf Stream, a warm, saline current from the Sargasso Sea. Their convergence, particularly near the Grand Banks, creates the Northwest Atlantic Convergence Zone, an area of intense mixing and fog. This system is a key component of the Atlantic meridional overturning circulation. The climate is heavily influenced by these currents, contributing to the famous Newfoundland fog and moderating coastal temperatures. Major water masses include Labrador Sea Water and North Atlantic Deep Water, formed through deep convection processes.

Marine ecosystems and biodiversity

The mixing of nutrient-rich currents supports exceptionally high primary productivity, forming the base for one of the world's most prolific marine ecosystems. The region is a vital habitat for countless species, including commercially important groundfish like Atlantic cod, haddock, and pollock. It supports large populations of humpback whale, North Atlantic right whale, and harp seal. The Grand Banks and Georges Bank are especially biodiverse. Key spawning and nursery areas exist in the Gulf of Maine and on the Scotian Shelf. The Sargasso Sea, while farther east, is ecologically connected through species like the American eel and loggerhead sea turtle that migrate through these waters.

Human history and exploration

The Northwest Atlantic has a deep human history, beginning with Indigenous peoples like the Mi'kmaq and Beothuk. It was likely reached by Norsemen from Greenland around 1000 AD, with archaeological evidence at L'Anse aux Meadows. The voyages of John Cabot in 1497, sponsored by Henry VII of England, marked the European rediscovery of the rich fishing grounds. Subsequent exploration and mapping were conducted by figures like Jacques Cartier and Samuel de Champlain. The region was central to the transatlantic cod trade, fueling European settlement and leading to centuries of conflict, including the French and Indian War. It was a major theatre during the Battle of the Atlantic in World War II.

Economic activities and resources

For centuries, the economy has been dominated by the fishing industry, historically centered on Atlantic cod but including lobster, scallop, and crab fisheries. Major ports like St. John's, Halifax, and Gloucester grew around this industry. Significant offshore oil and gas resources are exploited on the Grand Banks, notably the Hibernia oil field. The region is a hub for shipping and submarine communications cable routes linking North America and Europe. Other activities include aquaculture, tourism (e.g., whale watching in Newfoundland), and marine biotechnology research centered at institutions like the Bedford Institute of Oceanography.

Environmental issues and conservation

The region faces severe environmental challenges, most famously the catastrophic collapse of the Atlantic cod stocks in the early 1990s, leading to a moratorium and profound social impacts in Newfoundland. Ongoing issues include overfishing, bycatch, and habitat destruction from bottom trawling. The endangered North Atlantic right whale is critically threatened by ship strikes and fishing gear entanglements. Climate change is causing rapid warming in the Gulf of Maine, altering species distributions and increasing ocean acidification. Conservation efforts are led by bodies like the Northwest Atlantic Fisheries Organization (NAFO) and include marine protected areas such as The Gully and the Northeast Canyons and Seamounts Marine National Monument.

Category:Atlantic Ocean Category:Regions of North America