
The Arctic (;
[ .] ) is the
polar region
The polar regions, also called the frigid zones or polar zones, of Earth are Earth's polar ice caps, the regions of the planet that surround its geographical poles (the North and South Poles), lying within the polar circles. These high latitu ...
of
Earth
Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...
that surrounds the
North Pole
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where the Earth's rotation, Earth's axis of rotation meets its surface. It is called the True North Pole to distingu ...
, lying within the
Arctic Circle
The Arctic Circle is one of the two polar circles, and the northernmost of the five major circle of latitude, circles of latitude as shown on maps of Earth at about 66° 34' N. Its southern counterpart is the Antarctic Circle.
The Arctic Circl ...
. The Arctic region, from the
IERS Reference Meridian
The IERS Reference Meridian (IRM), also called the International Reference Meridian, is the prime meridian (0° longitude) maintained by the International Earth Rotation and Reference Systems Service (IERS). It passes about 5.3 arcseconds ...
travelling east, consists of parts of northern Norway (
Nordland
Nordland (; , , , ) is one of the three northernmost Counties of Norway, counties in Norway in the Northern Norway region, bordering Troms in the north, Trøndelag in the south, Norrbotten County in Sweden to the east, Västerbotten County to t ...
,
Troms
Troms (; ; ; ) is a Counties of Norway, county in northern Norway. It borders Finnmark county to the northeast and Nordland county in the southwest. Norrbotten Län in Sweden is located to the south and further southeast is a shorter border with ...
,
Finnmark
Finnmark (; ; ; ; ) is a counties of Norway, county in northern Norway. By land, it borders Troms county to the west, Finland's Lapland (Finland), Lapland region to the south, and Russia's Murmansk Oblast to the east, and by water, the Norweg ...
,
Svalbard
Svalbard ( , ), previously known as Spitsbergen or Spitzbergen, is a Norway, Norwegian archipelago that lies at the convergence of the Arctic Ocean with the Atlantic Ocean. North of continental Europe, mainland Europe, it lies about midway be ...
and
Jan Mayen
Jan Mayen () is a Norway, Norwegian volcanic island in the Arctic Ocean with no permanent population. It is long (southwest-northeast) and in area, partly covered by glaciers (an area of around the Beerenberg volcano). It has two parts: la ...
), northernmost Sweden (
Västerbotten
Västerbotten (), sometimes called West Bothnia or Westrobothnia, is a province (''landskap'') in northern Sweden, located by the Gulf of Bothnia. It borders the provinces of Ångermanland, Lapland and Norrbotten. The region is famous for Väs ...
,
Norrbotten
Norrbotten (), sometimes called North Bothnia, is a Swedish province (''landskap'') in northernmost Sweden. It borders south to Västerbotten, west to Swedish Lapland, and east to Finland.
Administration
The traditional provinces of Swede ...
and
Lappland), northern Finland (
North Ostrobothnia
North Ostrobothnia (; ) is a Regions of Finland, region of Finland. It borders the Finnish regions of Lapland (Finland), Lapland, Kainuu, Northern Savonia, North Savo, Central Finland and Central Ostrobothnia, as well as the Russian Republic of ...
,
Kainuu
Kainuu (), also historically known as Cajania (), is one of the 19 regions of Finland (''maakunta'' / ''landskap''). Kainuu borders the regions of North Ostrobothnia, North Savo and North Karelia. In the east, it also borders Russia (Republic o ...
and
Lappi), Russia (
Murmansk
Murmansk () is a port city and the administrative center of Murmansk Oblast in the far Far North (Russia), northwest part of Russia. It is the world's largest city north of the Arctic Circle and sits on both slopes and banks of a modest fjord, Ko ...
,
Siberia
Siberia ( ; , ) is an extensive geographical region comprising all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has formed a part of the sovereign territory of Russia and its predecessor states ...
,
Nenets Okrug,
Novaya Zemlya
Novaya Zemlya (, also , ; , ; ), also spelled , is an archipelago in northern Russia. It is situated in the Arctic Ocean, in the extreme northeast of Europe, with Cape Flissingsky, on the northern island, considered the extreme points of Europe ...
), the United States (
Alaska
Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...
), Canada (
Yukon
Yukon () is a Provinces and territories of Canada, territory of Canada, bordering British Columbia to the south, the Northwest Territories to the east, the Beaufort Sea to the north, and the U.S. state of Alaska to the west. It is Canada’s we ...
,
Northwest Territories
The Northwest Territories is a federal Provinces and territories of Canada, territory of Canada. At a land area of approximately and a 2021 census population of 41,070, it is the second-largest and the most populous of Provinces and territorie ...
,
Nunavut
Nunavut is the largest and northernmost Provinces and territories of Canada#Territories, territory of Canada. It was separated officially from the Northwest Territories on April 1, 1999, via the ''Nunavut Act'' and the Nunavut Land Claims Agr ...
),
Danish Realm
The Danish Realm, officially the Kingdom of Denmark, or simply Denmark, is a sovereign state consisting of a collection of constituent territories united by the Constitution of Denmark, Constitutional Act, which applies to the entire territor ...
(
Greenland
Greenland is an autonomous territory in the Danish Realm, Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. Citizens of Greenlan ...
), and northern Iceland (
Grímsey
Grímsey () is a small Icelandic island, off the north coast of the main island of Iceland, where it straddles the Arctic Circle. Grímsey is also known for the puffins and other sea birds which visit the island for breeding.
The island is a ...
and
Kolbeinsey
Kolbeinsey (; also known as Kolbeinn's Isle, Seagull Rock, Mevenklint, Mevenklip, or Meeuw Steen) is a small Icelandic islet in the Greenland Sea located off the northern coast of Iceland, north-northwest of the island of Grímsey. It is the n ...
), along with the
Arctic Ocean
The Arctic Ocean is the smallest and shallowest of the world's five oceanic divisions. It spans an area of approximately and is the coldest of the world's oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, ...
and adjacent seas.
Land within the Arctic region has seasonally varying
snow and ice cover, with predominantly treeless
permafrost
Permafrost () is soil or underwater sediment which continuously remains below for two years or more; the oldest permafrost has been continuously frozen for around 700,000 years. Whilst the shallowest permafrost has a vertical extent of below ...
under the
tundra
In physical geography, a tundra () is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. There are three regions and associated types of tundra: #Arctic, Arctic, Alpine tundra, Alpine, and #Antarctic ...
. Arctic seas contain seasonal
sea ice
Sea ice arises as seawater freezes. Because ice is less density, dense than water, it floats on the ocean's surface (as does fresh water ice). Sea ice covers about 7% of the Earth's surface and about 12% of the world's oceans. Much of the world' ...
in many places.
The Arctic region is a unique area among Earth's ecosystems. The cultures in the region and the
Arctic indigenous peoples have adapted to its cold and extreme conditions. Life in the Arctic includes
zooplankton
Zooplankton are the heterotrophic component of the planktonic community (the " zoo-" prefix comes from ), having to consume other organisms to thrive. Plankton are aquatic organisms that are unable to swim effectively against currents. Consequent ...
and
phytoplankton
Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater Aquatic ecosystem, ecosystems. The name comes from the Greek language, Greek words (), meaning 'plant', and (), mea ...
, fish and
marine mammal
Marine mammals are mammals that rely on marine ecosystems for their existence. They include animals such as cetaceans, pinnipeds, sirenians, sea otters and polar bears. They are an informal group, unified only by their reliance on marine enviro ...
s, birds, land animals, plants, and human societies. Arctic land is bordered by the
subarctic
The subarctic zone is a region in the Northern Hemisphere immediately south of the true Arctic, north of hemiboreal regions and covering much of Alaska, Canada, Iceland, the north of Fennoscandia, Northwestern Russia, Siberia, and the Cair ...
.
Definition and etymology
The word Arctic comes from the
Greek
Greek may refer to:
Anything of, from, or related to Greece, a country in Southern Europe:
*Greeks, an ethnic group
*Greek language, a branch of the Indo-European language family
**Proto-Greek language, the assumed last common ancestor of all kno ...
word ''arktikos'' "near the Bear, northern" and from the word ''arktos'' meaning "bear" for either to the
constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.
The first constellati ...
known as
Ursa Major
Ursa Major, also known as the Great Bear, is a constellation in the Northern Sky, whose associated mythology likely dates back into prehistory. Its Latin name means "greater (or larger) bear", referring to and contrasting it with nearby Ursa M ...
, the "Great Bear", which is prominent in the northern portion of the
celestial sphere
In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, ...
, or the constellation
Ursa Minor
Ursa Minor (, contrasting with Ursa Major), also known as the Little Bear, is a constellation located in the far northern celestial hemisphere, northern sky. As with the Great Bear, the tail of the Little Bear may also be seen as the handle of ...
, the "Little Bear", which contains the
celestial north pole (currently very near
Polaris
Polaris is a star in the northern circumpolar constellation of Ursa Minor. It is designated α Ursae Minoris (Latinisation of names, Latinized to ''Alpha Ursae Minoris'') and is commonly called the North Star or Pole Star. With an ...
, the current north Pole Star, or North Star).
There are several definitions of what area is contained within the Arctic. The area can be defined as north of the
Arctic Circle
The Arctic Circle is one of the two polar circles, and the northernmost of the five major circle of latitude, circles of latitude as shown on maps of Earth at about 66° 34' N. Its southern counterpart is the Antarctic Circle.
The Arctic Circl ...
(about 66° 34'N), the approximate southern limit of the
midnight sun
Midnight sun, also known as polar day, is a natural phenomenon that occurs in the summer months in places north of the Arctic Circle or south of the Antarctic Circle, when the Sun remains visible at the local midnight. When midnight sun is see ...
and the
polar night
Polar night is a phenomenon that occurs in the polar regions of Earth, northernmost and southernmost regions of Earth when the Sun remains below the horizon for more than 24 hours. This only occurs inside the polar circles. The opposite phen ...
. Another definition of the Arctic, which is popular with
ecologists
This is a list of notable ecologists.
A-D
* John Aber (United States)
* Aziz Ab'Saber (Brazil)
* Charles Christopher Adams (United States)
* Warder Clyde Allee (United States)
* Herbert G. Andrewartha (Australia)
* Sarah Martha Baker ( ...
, is the region in the
Northern Hemisphere
The Northern Hemisphere is the half of Earth that is north of the equator. For other planets in the Solar System, north is defined by humans as being in the same celestial sphere, celestial hemisphere relative to the invariable plane of the Solar ...
where the average temperature for the warmest month (July) is below ; the northernmost
tree line
The tree line is the edge of a habitat at which trees are capable of growing and beyond which they are not. It is found at high elevations and high latitudes. Beyond the tree line, trees cannot tolerate the environmental conditions (usually low ...
roughly follows the
isotherm at the boundary of this region.
Climate

The
climate of the Arctic
The climate of the Arctic is characterized by long, cold winters and short, cool summers. There is a large amount of variability in climate across the Arctic, but all regions experience extremes of Solar irradiance, solar radiation in both summ ...
region is characterized by cold winters and cool summers. Its precipitation mostly comes in the form of snow and is low, with most of the area receiving less than . High winds often stir up snow, creating the illusion of continuous snowfall. Average winter temperatures can go as low as , and the coldest recorded temperature is approximately . Coastal Arctic climates are moderated by oceanic influences, having generally warmer temperatures and heavier snowfalls than the colder and drier interior areas. The Arctic is affected by current
global warming
Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes ...
, leading to
climate change in the Arctic
Due to climate change in the Arctic, this polar region is expected to become "profoundly different" by 2050. The speed of change is "among the highest in the world", with the rate of warming being 3-4 times faster than the global average. This w ...
, including
Arctic sea ice decline
Sea ice in the Arctic region has declined in recent decades in area and volume due to climate change. It has been melting more in summer than it refreezes in winter. Global warming, caused by Radiative forcing#Forcing due to changes in atmospheri ...
, diminished ice in the
Greenland ice sheet
The Greenland ice sheet is an ice sheet which forms the second largest body of ice in the world. It is an average of thick and over thick at its maximum. It is almost long in a north–south direction, with a maximum width of at a latitude ...
, and
Arctic methane emissions
Arctic methane emissions contribute to a rise in Atmospheric methane, methane concentrations in the atmosphere. Whilst the Arctic region is one of Methane emissions, many natural sources of the greenhouse gas methane, there is nowadays also a human ...
as the
permafrost
Permafrost () is soil or underwater sediment which continuously remains below for two years or more; the oldest permafrost has been continuously frozen for around 700,000 years. Whilst the shallowest permafrost has a vertical extent of below ...
thaws. The melting of Greenland's ice sheet is linked to
polar amplification
Polar amplification is the phenomenon that any change in the net radiation balance (for example greenhouse intensification) tends to produce a larger change in temperature near the poles than in the planetary average. This is commonly referred to ...
.
Due to the poleward migration of the planet's isotherms (about per decade during the past 30 years as a consequence of global warming), the Arctic region (as defined by
tree line
The tree line is the edge of a habitat at which trees are capable of growing and beyond which they are not. It is found at high elevations and high latitudes. Beyond the tree line, trees cannot tolerate the environmental conditions (usually low ...
and temperature) is currently shrinking. Perhaps the most alarming result of this is Arctic sea ice shrinkage. There is a large variance in predictions of Arctic
sea ice
Sea ice arises as seawater freezes. Because ice is less density, dense than water, it floats on the ocean's surface (as does fresh water ice). Sea ice covers about 7% of the Earth's surface and about 12% of the world's oceans. Much of the world' ...
loss, with models showing near-complete to complete loss in September from 2035 to sometime around 2067.
Flora and fauna
Arctic life is characterized by adaptation to short growing seasons with long periods of sunlight, and cold, dark, snow-covered winter conditions.
Plants
Arctic vegetation is composed of plants such as
dwarf shrubs,
graminoid
In botany and ecology, a graminoid refers to a herbaceous plant with a grass-like morphology, i.e., elongated culms with long, blade-like leaves. They are contrasted with forbs, herbaceous plants without grass-like features.
The plants most ...
s,
herb
Herbs are a widely distributed and widespread group of plants, excluding vegetables, with savory or aromatic properties that are used for flavoring and garnishing food, for medicinal purposes, or for fragrances. Culinary use typically distingu ...
s,
lichen
A lichen ( , ) is a hybrid colony (biology), colony of algae or cyanobacteria living symbiotically among hypha, filaments of multiple fungus species, along with yeasts and bacteria embedded in the cortex or "skin", in a mutualism (biology), m ...
s, and
moss
Mosses are small, non-vascular plant, non-vascular flowerless plants in the taxonomic phylum, division Bryophyta (, ) ''sensu stricto''. Bryophyta (''sensu lato'', Wilhelm Philippe Schimper, Schimp. 1879) may also refer to the parent group bryo ...
es, which all grow relatively close to the ground, forming
tundra
In physical geography, a tundra () is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. There are three regions and associated types of tundra: #Arctic, Arctic, Alpine tundra, Alpine, and #Antarctic ...
. An example of a dwarf shrub is the
bearberry
Bearberries are three species of dwarf shrubs in the genus ''Arctostaphylos''. Unlike the other species of ''Arctostaphylos'' (see manzanita), they are adapted to Arctic and subarctic climates, and have a circumpolar distribution in northern N ...
. As one moves northward, the amount of warmth available for plant growth decreases considerably. In the northernmost areas, plants are at their metabolic limits, and small differences in the total amount of summer warmth make large differences in the amount of energy available for maintenance, growth, and reproduction. Colder summer temperatures cause the size, abundance, productivity, and variety of plants to decrease. Trees cannot grow in the Arctic, but in its warmest parts, shrubs are common and can reach in height;
sedges
The Cyperaceae () are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large; botanists have described some 5,500 known species in about 90 generathe largest being the "true sedges" (genu ...
, mosses and lichens can form thick layers. In the coldest parts of the Arctic, much of the ground is bare;
non-vascular plant
Non-vascular plants are plants without a vascular system consisting of xylem and phloem. Instead, they may possess simpler tissues that have specialized functions for the internal transport of water.
Non-vascular plants include two distantly rel ...
s such as lichens and mosses predominate, along with a few scattered grasses and
forb
A forb or phorb is a herbaceous flowering plant that is not a graminoid (grass, sedge, or rush). The term is used in botany and in vegetation ecology especially in relation to grasslands and understory. Typically, these are eudicots without woo ...
s (like the
Arctic poppy).
Animals

Herbivores on the tundra include the
Arctic hare
The Arctic hare (''Lepus arcticus'') is a species of hare highly adapted to living in the Arctic tundra and other icy biomes. The Arctic hare survives with shortened ears and limbs, a small nose, fat that makes up close to 20% of its body, and a ...
,
lemming
A lemming is a small rodent, usually found in or near the Arctic in tundra biomes. Lemmings form the subfamily Arvicolinae (also known as Microtinae) together with voles and muskrats, which form part of the superfamily Muroidea, which also inclu ...
,
muskox
The muskox (''Ovibos moschatus'') is a hoofed mammal of the family Bovidae. Native to the Arctic, it is noted for its thick coat and for the strong odor emitted by males during the seasonal rut, from which its name derives. This musky odor ha ...
, and
reindeer
The reindeer or caribou (''Rangifer tarandus'') is a species of deer with circumpolar distribution, native to Arctic, subarctic, tundra, taiga, boreal, and mountainous regions of Northern Europe, Siberia, and North America. It is the only re ...
(caribou). They are preyed on by the
snowy owl
The snowy owl (''Bubo scandiacus''), also known as the polar owl, the white owl and the Arctic owl, is a large, white owl of the true owl family. Snowy owls are native to the Arctic regions of both North America and the Palearctic, breeding mo ...
,
Arctic fox
The Arctic fox (''Vulpes lagopus''), also known as the white fox, polar fox, or snow fox, is a small species of fox native to the Arctic regions of the Northern Hemisphere and common throughout the Tundra#Arctic tundra, Arctic tundra biome. I ...
,
grizzly bear
The grizzly bear (''Ursus arctos horribilis''), also known as the North American brown bear or simply grizzly, is a population or subspecies of the brown bear inhabiting North America.
In addition to the mainland grizzly (''Ursus arctos horr ...
, and
Arctic wolf
The Arctic wolf (''Canis lupus arctos''), also known as the white wolf, polar wolf, and the Arctic grey wolf, is a Subspecies of Canis lupus, subspecies of grey wolf native to the High Arctic tundra of Canada's Queen Elizabeth Islands, from Me ...
. The
polar bear
The polar bear (''Ursus maritimus'') is a large bear native to the Arctic and nearby areas. It is closely related to the brown bear, and the two species can Hybrid (biology), interbreed. The polar bear is the largest extant species of bear ...
is also a predator, though it prefers to hunt for marine life from the ice. There are also many
birds
Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...
and marine species endemic to the colder regions. Other terrestrial animals include
wolverine
The wolverine ( , ; ''Gulo gulo''), also called the carcajou or quickhatch (from East Cree, ''kwiihkwahaacheew''), is the largest land-dwelling species, member of the family Mustelidae. It is a muscular carnivore and a solitary animal. The w ...
s,
moose
The moose (: 'moose'; used in North America) or elk (: 'elk' or 'elks'; used in Eurasia) (''Alces alces'') is the world's tallest, largest and heaviest extant species of deer and the only species in the genus ''Alces''. It is also the tal ...
,
Dall sheep
''Ovis dalli'', also known as the Dall sheep or thinhorn sheep, is a species of wild sheep native to northwestern North America. ''Ovis dalli'' contains two subspecies: ''Ovis dalli dalli'' and ''Stone sheep, Ovis dalli stonei''. ''O. dalli'' li ...
,
ermines, and
Arctic ground squirrel
The Arctic ground squirrel (''Urocitellus parryii'') (Inuktitut: ''ᓯᒃᓯᒃ, siksik'') is a species of ground squirrel in the squirrel family Sciuridae that is native to the Arctic and Subarctic regions of the Northern Hemisphere, mainly in N ...
s. Marine mammals include
seals
Seals may refer to:
* Pinniped, a diverse group of semi-aquatic marine mammals, many of which are commonly called seals, particularly:
** Earless seal, or "true seal"
** Fur seal
* Seal (emblem), a device to impress an emblem, used as a means of a ...
,
walrus
The walrus (''Odobenus rosmarus'') is a large pinniped marine mammal with discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. It is the only extant species in the family Odobeni ...
es, and several species of
cetacea
Cetacea (; , ) is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins and porpoises. Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size and exclusively c ...
n—
baleen whale
Baleen whales (), also known as whalebone whales, are marine mammals of the order (biology), parvorder Mysticeti in the infraorder Cetacea (whales, dolphins and porpoises), which use baleen plates (or "whalebone") in their mouths to sieve plankt ...
s and also
narwhal
The narwhal (''Monodon monoceros'') is a species of toothed whale native to the Arctic. It is the only member of the genus ''Monodon'' and one of two living representatives of the family Monodontidae. The narwhal is a stocky cetacean with a ...
s,
orca
The orca (''Orcinus orca''), or killer whale, is a toothed whale and the largest member of the oceanic dolphin family. The only extant species in the genus '' Orcinus'', it is recognizable by its black-and-white-patterned body. A cosmopol ...
s, and
belugas.
Natural resources
There are copious
natural resources in the Arctic (oil, gas, minerals, freshwater, fish, and, if the subarctic is included, forest) to which modern technology and the
economic opening up of Russia have given significant new opportunities. The interest in the tourism industry is also on the increase.
The Arctic contains some of the last and most extensive continuous
wilderness
Wilderness or wildlands (usually in the plurale tantum, plural) are Earth, Earth's natural environments that have not been significantly modified by human impact on the environment, human activity, or any urbanization, nonurbanized land not u ...
areas in the world, and its significance in preserving
biodiversity
Biodiversity is the variability of life, life on Earth. It can be measured on various levels. There is for example genetic variability, species diversity, ecosystem diversity and Phylogenetics, phylogenetic diversity. Diversity is not distribut ...
and
genotype
The genotype of an organism is its complete set of genetic material. Genotype can also be used to refer to the alleles or variants an individual carries in a particular gene or genetic location. The number of alleles an individual can have in a ...
s is considerable. The increasing presence of humans fragments vital habitats. The Arctic is particularly susceptible to the abrasion of
groundcover
Groundcover or ground cover is any plant that grows low over an area of ground, which protects the topsoil from erosion and drought. In a terrestrial ecosystem, the ground cover forms the layer of vegetation below the shrub layer known as the ...
and to the disturbance of the rare breeding grounds of the animals that are characteristic of the region. The Arctic also holds 1/5 of the Earth's water supply.
Paleontology
During the
Cretaceous period
The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 77.1 million years, it is the ninth and longest geologi ...
, the Arctic still had seasonal snows, though only a light dusting and not enough to permanently hinder plant growth. Animals such as the ''
Chasmosaurus
''Chasmosaurus'' ( ) is a genus of ceratopsid dinosaur from the Late Cretaceous Period in North America. Its given name means 'opening lizard', referring to the large openings ( fenestrae) in its frill (Greek ''chasma'', meaning 'opening', 'hol ...
'', ''
Hypacrosaurus
''Hypacrosaurus'' (meaning "near the highest lizard" reek υπο-, ''hypo-'' = less + ακρος, ''akros'', high
Reek may refer to:
Places
* Reek, Netherlands, a village in the Dutch province of North Brabant
* Croagh Patrick, a mountain in the west of Ireland nicknamed "The Reek"
People
* Nikolai Reek (1890–1942), Estonian military commander
* Salme Ree ...
because it was almost but not quite as large as ''Tyrannosaurus'') is an extinct genus of hadrosaurid, duckbill dinosaur simila ...
'', ''
Troodon
''Troodon'' ( ; ''Troödon'' in older sources) is a controversial genus of relatively small, bird-like theropod dinosaurs definitively known from the Campanian age of the Late Cretaceous period (about 77 million years ago). It includes at l ...
'', and ''
Edmontosaurus
''Edmontosaurus'' ( ) (meaning "lizard from Edmonton"), with the second species often colloquially and historically known as ''Anatosaurus'' or ''Anatotitan'' (meaning "duck lizard" and "giant duck"), is a genus of hadrosaurid (duck-billed) din ...
'' may have all migrated north to take advantage of the summer growing season, and migrated south to warmer climes when winter came. A similar situation may also have been found amongst
dinosaur
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic Geological period, period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the #Evolutio ...
s that lived in
Antarctic
The Antarctic (, ; commonly ) is the polar regions of Earth, polar region of Earth that surrounds the South Pole, lying within the Antarctic Circle. It is antipodes, diametrically opposite of the Arctic region around the North Pole.
The Antar ...
regions, such as the ''
Muttaburrasaurus
''Muttaburrasaurus'' was a genus of herbivorous iguanodontian ornithopod dinosaur that lived in what is now northeastern Australia sometime between 112 and 103 million years agoHoltz, Thomas R. Jr. (2012) ''Dinosaurs: The Most Complete, Up-to ...
'' of Australia.
However, others claim that dinosaurs lived year-round at very high latitudes, such as near the
Colville River, which is now at about 70° N but at the time (70 million years ago) was 10° further north.
Indigenous population
The earliest inhabitants of North America's central and eastern Arctic are referred to as the
Arctic small tool tradition (AST) and existed . AST consisted of several
Paleo-Eskimo
The Paleo-Eskimo meaning ''"old Eskimos"'', also known as, pre-Thule people, Thule or pre-Inuit, were the peoples who inhabited the Arctic region from Chukotka Autonomous Okrug, Chukotka (e.g., Chertov Ovrag) in present-day Russia across North Am ...
cultures, including the
Independence cultures and
Pre-Dorset
The Pre-Dorset is a loosely defined term for a Paleo-Eskimo culture or group of cultures that existed in the Eastern Canadian Arctic from c. 3200 to 850 cal BC, and preceded the Dorset culture.
Due to its vast geographical expanse and to histor ...
cultures.
[Gibbon, pp. 28–31] The
Dorset culture
The Dorset was a Paleo-Eskimo culture, lasting from to between and , that followed the Pre-Dorset and preceded the Thule people (proto-Inuit) in the North American Arctic. The culture and people are named after Cape Dorset (now Kinngait) in ...
(
Inuktitut
Inuktitut ( ; , Inuktitut syllabics, syllabics ), also known as Eastern Canadian Inuktitut, is one of the principal Inuit languages of Canada. It is spoken in all areas north of the North American tree line, including parts of the provinces of ...
: ''Tuniit'' or ''Tunit'') refers to the next inhabitants of central and eastern Arctic. The Dorset culture evolved because of technological and economic changes during 1050–550 BCE. With the exception of the
Quebec
Quebec is Canada's List of Canadian provinces and territories by area, largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, ...
/
Labrador
Labrador () is a geographic and cultural region within the Canadian province of Newfoundland and Labrador. It is the primarily continental portion of the province and constitutes 71% of the province's area but is home to only 6% of its populatio ...
peninsula, the Dorset culture vanished around 1500 CE. Supported by
genetic testing
Genetic testing, also known as DNA testing, is used to identify changes in DNA sequence or chromosome structure. Genetic testing can also include measuring the results of genetic changes, such as RNA analysis as an output of gene expression, or ...
, evidence shows that descendants of the Dorset culture, known as the Sadlermiut, survived in Aivilik, Southampton Island, Southampton and Coats Islands, until the beginning of the 20th century.
The Dorset / Thule people, Thule culture transition dates around the ninth–10th centuries CE. Scientists theorize that there may have been cross-contact between the two cultures with the sharing of technology, such as fashioning harpoon heads, or the Thule may have found Dorset remnants and adapted their ways with the predecessor culture. The evidence suggested that Inuit descend from the Birnirk culture, Birnirk of Siberia, through the Thule culture Pre-modern human migration, expanded into northern Canada and Greenland, where they genetically and culturally completely replaced the Indigenous Dorset people sometime after 1300 CE. The question of why the Dorset disappeared so completely has led some to suggest that Thule invaders wiped out the Dorset people in "an example of prehistoric genocide."
By 1300 CE, the Inuit, present-day Arctic inhabitants and descendants of Thule culture, had settled in west Greenland and moved into east Greenland over the following century (Inughuit, Kalaallit and Tunumiit are modern Greenlandic Inuit groups descended from Thule). Over time, the Inuit have migrated throughout the Arctic regions of Eastern Russia, the United States, Canada, and Greenland.
Other Circumpolar peoples, Circumpolar North indigenous peoples include the Chukchi people, Chukchi, Evenks, Iñupiat, Khanty, Koryaks, Nenets, Sámi peoples, Sámi, Yukaghir people, Yukaghir, Gwichʼin, and Yupik peoples, Yupik.
International cooperation and politics

The eight Arctic nations (Canada, Kingdom of Denmark [Greenland & The Faroe Islands], Finland, Iceland, Norway, Sweden, Russia, and US) are all members of the Arctic Council, as are organizations representing six indigenous populations (The Arctic Council Indigenous Peoples Secretariat#Aleut International Association, Aleut International Association, Arctic Council Indigenous Peoples Secretariat#Arctic Athabaskan Council, Arctic Athabaskan Council, Arctic Council Indigenous Peoples Secretariat#Gwich'in Council International, Gwich'in Council International, Inuit Circumpolar Council, Russian Association of Indigenous Peoples of the North, and Saami Council). The council operates on a consensus basis, mostly dealing with environmental treaties and not addressing boundary or resource disputes.
Though Arctic cooperation and politics, Arctic policy priorities differ, every Arctic nation is concerned about sovereignty/defense, resource development, shipping routes, and environmental protection.
Much work remains on regulatory agreements regarding shipping, tourism, and Arctic resources race, resource development in Arctic waters. Arctic shipping is subject to some regulatory control through the International Code for Ships Operating in Polar Waters, adopted by the International Maritime Organization on 1 January 2017 and applies to all ships in Arctic waters over 500 tonnes.
Research in the Arctic has long been a collaborative international effort, evidenced by the International Polar Year. The International Arctic Science Committee, hundreds of scientists and specialists of the Arctic Council, and the Barents Euro-Arctic Council are more examples of collaborative international Arctic research.
Territorial claims
While there are several ongoing territorial claims in the Arctic, no country owns the geographic
North Pole
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where the Earth's rotation, Earth's axis of rotation meets its surface. It is called the True North Pole to distingu ...
or the region of the Arctic Ocean surrounding it. The surrounding six Arctic states that border the Arctic Ocean—Canada, the Kingdom of Denmark (with Greenland), Iceland, Norway, Russia, and the United States—are limited to a exclusive economic zone (EEZ) off their coasts. Two Arctic states (Finland and Sweden) do not have direct access to the Arctic Ocean.
Upon ratification of the United Nations Convention on the Law of the Sea, a country has ten years to make claims to an extended continental shelf beyond its 200 nautical mile zone.
Due to this, Norway (which ratified the convention in 1996),
Russia (ratified in 1997),
Canada (ratified in 2003)
and the Kingdom of Denmark (ratified in 2004)
launched projects to establish claims that certain sectors of the Arctic seabed should belong to their territories.
On 2 August 2007, two Russian bathyscaphes, Mir (submersible), MIR-1 and MIR-2, for the first time in history descended to the Arctic seabed beneath the North Pole and placed there a flag of Russia, Russian flag made of rust-proof titanium alloys, titanium alloy. The flag-placing, during Arktika 2007, generated commentary on and concern for a race for control of the Arctic's vast hydrocarbon resources.
Foreign ministers and other officials representing Canada, the Kingdom of Denmark, Norway, Russia, and the United States met in Ilulissat, Ilulissat, Greenland on 28 May 2008 at the Arctic Ocean Conference and announced the Ilulissat Declaration, blocking any "new comprehensive international legal regime to govern the Arctic Ocean," and pledging "the orderly settlement of any possible overlapping claims."
As of 2012, the Kingdom of Denmark is claiming the continental shelf based on the Lomonosov Ridge between Greenland and over the North Pole to the northern limit of the exclusive economic zone of Russia.
The Russian Federation is also Continental shelf of Russia#2001 extension claim, claiming a large swath of seabed along the Lomonosov Ridge but, unlike Denmark, confined its claim to its side of the Arctic region. In August 2015, Russia made a supplementary submission for the expansion of the external borders of its continental shelf in the
Arctic Ocean
The Arctic Ocean is the smallest and shallowest of the world's five oceanic divisions. It spans an area of approximately and is the coldest of the world's oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, ...
, asserting that the eastern part of the Lomonosov Ridge and the Mendeleyev Ridge is an extension of the Eurasian continent. In August 2016, the United Nations Convention on the Law of the Sea, UN Commission on the Limits of the Continental Shelf began to consider Russia's submission.
Canada claims the Northwest Passage as part of its Canadian Internal Waters, internal waters belonging to Canada, while the United States and most maritime nations regards it as an Territorial waters, international strait, which means that foreign vessels have right of transit passage.
Exploration
Since 1937, the larger portion of the Asian-side Arctic region has been extensively explored by Soviet and Russian crewed drifting ice stations. Between 1937 and 1991, 88 international polar crews established and occupied scientific settlements on the drift ice and were carried thousands of kilometers by the ice flow. Modern day scientists now rely more heavily on unmanned buoys and ice-tethered observatories than crewed stations for Arctic research and exploration
Pollution
The Arctic is comparatively clean, although there are certain ecologically difficult Pollution in the Arctic Ocean, localized pollution problems that present a serious threat to people's health living around these pollution sources. Due to the prevailing worldwide sea and air currents, the Arctic area is the fallout region for long-range transport pollutants, and in some places, the concentrations exceed the levels of densely populated urban areas. An example of this is the phenomenon of Arctic haze, which is commonly blamed on long-range pollutants. Another example is with the bioaccumulation of PCBs (polychlorinated biphenyls) in Arctic wildlife and people.
Preservation
There have been many proposals to preserve the Arctic over the years. Most recently a group of states at the United Nations Conference on Sustainable Development, on 21 June 2012, proposed protecting the Arctic, similar to the Antarctic Treaty System. The initial focus of the campaign will be a UN resolution creating a global sanctuary around the pole, and a ban on oil drilling and unsustainable fishing in the Arctic.
The Arctic has climate change rates that are amongst the highest in the world. Due to the major impacts to the region from climate change the near climate future of the region will be extremely different under all scenarios of warming.
Climate change
The effects of climate change in the Arctic include rising temperatures, loss of
sea ice
Sea ice arises as seawater freezes. Because ice is less density, dense than water, it floats on the ocean's surface (as does fresh water ice). Sea ice covers about 7% of the Earth's surface and about 12% of the world's oceans. Much of the world' ...
, and melting of the
Greenland ice sheet
The Greenland ice sheet is an ice sheet which forms the second largest body of ice in the world. It is an average of thick and over thick at its maximum. It is almost long in a north–south direction, with a maximum width of at a latitude ...
. Potential Arctic methane emissions, methane release from the region, especially through the thawing of
permafrost
Permafrost () is soil or underwater sediment which continuously remains below for two years or more; the oldest permafrost has been continuously frozen for around 700,000 years. Whilst the shallowest permafrost has a vertical extent of below ...
and methane clathrates, is also a concern. Because of the Polar amplification, amplified response of the Arctic to global warming, it is often seen as a leading indicator of global warming. The melting of Greenland's ice sheet is linked to polar amplification.
The Arctic region is especially vulnerable to the effects of any climate change, as has become apparent with the reduction of sea ice in recent years. Climate models predict much greater
climate change in the Arctic
Due to climate change in the Arctic, this polar region is expected to become "profoundly different" by 2050. The speed of change is "among the highest in the world", with the rate of warming being 3-4 times faster than the global average. This w ...
than the global average,
resulting in significant international attention to the region. In particular, there are concerns that Arctic shrinkage, a consequence of melting glaciers and other ice in Greenland, could soon contribute to a substantial rise in sea levels worldwide.
The current Arctic warming is leading to ancient carbon being released from thawing
permafrost
Permafrost () is soil or underwater sediment which continuously remains below for two years or more; the oldest permafrost has been continuously frozen for around 700,000 years. Whilst the shallowest permafrost has a vertical extent of below ...
, leading to methane and carbon dioxide production by micro-organisms. Release of methane and carbon dioxide stored in permafrost could cause abrupt and severe global warming, as they are potent greenhouse gases.
Climate change is also predicted to have a large impact on tundra vegetation, causing an increase of shrubs, and having a negative impact on bryophytes and lichens.
Apart from concerns regarding the detrimental effects of warming in the Arctic, some potential opportunities have gained attention. The melting of the ice is making the Northwest Passage, shipping routes through the northernmost latitudes, more navigable, raising the possibility that the Arctic region will become a prime trade route. One harbinger of the opening navigability of the Arctic took place in the summer of 2016 when the Crystal Serenity successfully navigated the Northwest Passage, a first for a large cruise ship.
In addition, it is believed that the Arctic seabed may contain substantial Petroleum reservoir#Oil field, oil fields which may become accessible if the ice covering them melts. These factors have led to recent international debates as to which nations can claim sovereignty or ownership over the waters of the Arctic.
[Shaw, Rob]
"New patrol ships will reassert northern sovereignty: PM".
Victoria Times Colonist. 9 July 2007.
Arctic waters
*
Arctic Ocean
The Arctic Ocean is the smallest and shallowest of the world's five oceanic divisions. It spans an area of approximately and is the coldest of the world's oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, ...
* Baffin Bay
* Beaufort Sea
* Barents Sea
* Bering Sea
* Bering Strait
* Chukchi Sea
* Davis Strait
* Denmark Strait
* East Siberian Sea
* Greenland Sea
* Hudson Bay
* Kara Sea
* Laptev Sea
* Nares Strait
* Norwegian Sea
Arctic lands
See also
* Arctic ecology
* Arctic Search and Rescue Agreement
* List of countries by northernmost point
* Arctic sanctuary
* Poverty in the Arctic
* Arctic Winter Games
* Winter City
* Global North
Notes
References
Bibliography
*
Further reading
* Brian W. Coad, James D. Reist. (2017). ''Marine Fishes of Arctic Canada''. University of Toronto Press.
"Global Security, Climate Change, and the Arctic" – 24-page special journal issue (Fall 2009), ''Swords and Ploughshares'', Program in Arms Control, Disarmament, and International Security (ACDIS), University of Illinois
GLOBIO Human Impact maps''Report on human impacts on the Arctic''
* Krupnik, Igor, Michael A. Lang, and Scott E. Miller, eds
''Smithsonian at the Poles: Contributions to International Polar Year Science.''Washington, D.C.: Smithsonian Institution Scholarly Press, 2009.
Konyshev, Valery & Sergunin, Alexander: The Arctic at the Crossroads of Geopolitical InterestsRussian Politics and Law, 2012, Vol.50, No.2, pp. 34–54
Käpylä, Juha & Mikkola, Harri: The Global Arctic: The Growing Arctic Interests of Russia, China, the United States and the European Union FIIA Briefing Paper 133, August 2013
The Finnish Institute of International Affairs
Konyshev, Valery & Sergunin, Alexander. The Arctic at the crossroads of geopolitical interests // Russian Politics and Law, 2012. Vol. 50, No. 2. p. 34–54Konyshev, Valery & Sergunin, Alexander: Is Russia a revisionist military power in the Arctic?Defense & Security Analysis, September 2014.
Konyshev, Valery & Sergunin, Alexander. Russia in search of its Arctic strategy: between hard and soft power?Polar Journal, April 2014.
* McCannon, John. ''A History of the Arctic: Nature, Exploration and Exploitation''. Reaktion Books and University of Chicago Press, 2012.
*
*
External links
Arctic Report CardBlossoming ArcticInternational Arctic Research Center
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Arctic,
Geography of North America
Geography of Northeast Asia
Geography of Europe
Geography of Siberia
Polar regions of the Earth