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From Wikipedia, the free encyclopedia

Gulf of Maine
French: Golfe du Maine
GulfofMaine2.jpg
Major features of the Gulf of Maine
LocationNortheast coast of the United States and southeast coast of Canada
Coordinates43°N 68°W / 43°N 68°W / 43; -68
Part ofNorth Atlantic Ocean
River sourcesSaint John River, Penobscot River
Catchment area69,000 square miles (180,000 km2)
Basin countriesUnited States, Canada
Surface area36,000 square miles (93,000 km2)
IslandsMount Desert Island, Fox Islands (North Haven and Vinalhaven), Isle au Haut, Grand Manan
SettlementsBoston, Portsmouth, Portland, Saint John

The Gulf of Maine (French: Golfe du Maine) is a large gulf of the Atlantic Ocean on the east coast of North America. It is bounded by Cape Cod at the eastern tip of Massachusetts in the southwest and by Cape Sable Island at the southern tip of Nova Scotia in the northeast. The gulf includes the entire coastlines of the U.S. states of New Hampshire and Maine, as well as Massachusetts north of Cape Cod, and the southern and western coastlines of the Canadian provinces of New Brunswick and Nova Scotia, respectively.

The gulf was named for the adjoining English colonial Province of Maine, which was in turn likely named by early explorers after the Province of Maine in France.[1] Massachusetts Bay, Penobscot Bay, Passamaquoddy Bay, and the Bay of Fundy are included within the Gulf of Maine system; as such, the Gulf of Maine is also home to the highest tidal variations on the planet (see Bay of Fundy for further information).

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Transcription

Contents

Geography and hydrography

The Gulf of Maine is a roughly rectangular depression with a surface area of around 36,000 square miles (93,000 km2), enclosed to the west and north by the North American mainland and communicating with the Atlantic Ocean to the southeast. The region's glaciation by the Laurentide Ice Sheet stripped sedimentary soil away from the coastline,[2] leaving a shore that is predominantly rocky and scenic, lacking the sandy beaches found to the south along the Eastern Seaboard. The only significant coastal developments are located in the Boston, Portsmouth, Portland and Saint John metropolitan areas.

The underwater features of the seabed sculptured during the lower sea levels of the ice ages make the gulf a semi-enclosed sea bounded to the south and east by underwater banks. Georges Bank in particular, on its southern end, shelters the gulf from the Gulf Stream. Gulf of Maine waters are more strongly influenced by the Labrador Current, making the gulf waters significantly colder and more nutrient-rich than those found to the south. Undersea valleys in the central basin can reach depths of 1,500 feet (500 m) while undersea mountains rise up 800 feet (266 m) from the sea floor, almost reaching the surface in some locations, or even exceeding it, creating islands.

There are three major basins contained within the Gulf of Maine: Wilkinson Basin to the west, Jordan Basin in the northeast, and Georges Basin in the south, which are isolated from each other beneath the 650 foot (200 m) isobath. Georges Basin, just north of Georges Bank, is the deepest of the three at just over 1200 feet (370 m) and generates a pocket at the end of the Northeast Channel, a deep fissure between Georges Bank and Browns Bank, the southwestern edge of the Nova Scotian Shelf. The Northeast Channel is the major channel between the Gulf and the rest of the Northwest Atlantic. A secondary, shallower connection to the rest of the Atlantic is the Great South Channel, located between Georges Bank and the Nantucket Shoals.

Ecology

The cold waters, extreme tidal mixing, and diverse bottom of the Gulf make it one of the most productive marine environments in the North Atlantic, and it furnishes habitat for many diverse species including most notably haddock, the Acadian redfish (Sebastes fasciatus), the Atlantic herring (Clupea harengus) and the American lobster (Homarus americanus), which grows to famously large sizes in the Gulf. The waters of the Gulf of Maine system, particularly at the boundary with the Bay of Fundy are also home to the summering grounds for many different bird and whale species, most notably the highly endangered North Atlantic right whale. The gulf was home to the sea mink until its extinction in the late 1800s.

Due to rapid warming of the Gulf of Maine, the water has become too hot for cod. This, along with past overfishing, has helped pushed stocks towards collapse and hampered its recovery despite deep reductions in the number of fish caught, according to a study conducted by the Gulf of Maine Research Institute. Traditional calculations "consistently over-estimated the abundance of cod." From 2004, temperatures rose by more than 0.4 °F (0.2 °C) per year, culminating in an ocean heat wave in the northwest Atlantic in 2012-13.[3]

Watershed

The Gulf of Maine drains a number of states and provinces along the North American coast.
The Gulf of Maine drains a number of states and provinces along the North American coast.

The watershed of the gulf encompasses an area of 69,000 sq mi (180,000 km2), including all of Maine, 70% of New Hampshire, 56% of New Brunswick, 41% of Massachusetts, and 36% of Nova Scotia. The watershed also includes a small southern portion (less than 1%) of the Canadian province of Quebec. Significant rivers that drain into the Gulf include, from east to west, the Annapolis, Shubenacadie, Salmon, Petitcodiac, Saint John, Magaguadavic, St. Croix, Penobscot, Kennebec, Saco, Piscataqua, Merrimack and Charles rivers; the Saint John and Penobscot having the greatest discharge.

History and political significance

Hampton Beach, New Hampshire, in mid-September 2004
Hampton Beach, New Hampshire, in mid-September 2004

The gulf's relative proximity to Europe made it an early destination for European colonization. French settlers founded a settlement on St. Croix Island in 1604. English settlers founded the Popham Colony on an island in the Kennebec River in 1607, the same year as the Jamestown settlement, followed by the Plymouth Colony on the shores of Massachusetts Bay in 1620.

In the 1960s and 1970s there was a dispute between Canada and the United States over fishing and other resource rights in the Gulf of Maine, specifically the Georges Bank region. This dispute was taken to the International Court of Justice, which delineated a maritime boundary through the Gulf in 1984. Canada and the U.S. continue to disagree on the sovereignty of Machias Seal Island and the waters surrounding it in the northeastern part of the gulf. In recognition of the Gulf's importance to marine habitat, both nations currently maintain complementary embargoes against offshore oil and gas exploration activities on Georges Bank in the southern part of the gulf.

See also

References

  1. ^ "Journal of the Senate" (PDF). State of Maine, HP1629, item 1, 123rd Maine State Legislature. March 6, 2002. Retrieved September 20, 2007. WHEREAS, the State of Maine is named after the Province of Maine in France...
  2. ^ Manahan, Abigail. "A Geologic History of the Gulf of Maine". Gulf of Maine Area Census of Marine Life. Retrieved November 23, 2017.
  3. ^ "Water Too Warm for Cod in U.S. Gulf of Maine, Stock Near Collapse". NBC News. Retrieved 3 November 2015.

External links

Media related to Gulf of Maine at Wikimedia Commons

This page was last edited on 22 April 2019, at 06:39
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