Arctic vs Antarctica: Two Very Different Polar Worlds

🗺️ Arctic vs Antarctica: Two Very Different Polar Worlds

The first thing to understand about polar environments is that the Arctic and Antarctica are fundamentally different in their physical nature — even though both are cold, icy and at opposite ends of the Earth. Getting this distinction right in an exam is essential.

The Arctic is an ocean — the Arctic Ocean — surrounded by the land masses of Canada, Russia, Greenland, Norway and Alaska. Most of the Arctic's "ice" is sea ice: frozen ocean water, typically 2–4 metres thick. This sea ice floats on the ocean surface, expanding in winter and retreating in summer. Beneath the sea ice there is ocean, not land. The land surrounding the Arctic Ocean is tundra — treeless, permafrost-underlain terrain covered in mosses, lichens and low-growing plants.

Antarctica, by contrast, is a continent — a landmass the size of Europe and the United States combined — surrounded by the Southern Ocean. Antarctica has an ice sheet resting directly on bedrock, up to 4.8 km thick in places. This is not floating sea ice: it is glacial ice built up over hundreds of thousands of years from compacted snow. Antarctica is the coldest, driest, windiest and highest continent on Earth, with an average elevation of 2,300 metres above sea level.

Feature	Arctic	Antarctica
Physical nature	Ocean (Arctic Ocean) surrounded by land	Continent (land mass) surrounded by ocean
Ice type	Floating sea ice, 2–4 m thick	Ice sheet on bedrock, up to 4.8 km thick
Area	~14 million km²	~14 million km²
Average winter temperature	Around −40°C	Around −60°C (interior plateau)
Lowest temperature recorded	−68°C (Siberia, adjacent land)	−89.2°C (Vostok Station, 1983)
Wind	Moderate; Arctic storms severe but not extreme	Katabatic winds reach 200 km/h off ice plateau
Annual precipitation	100–200 mm/year (polar desert)	Less than 50 mm/year (largest cold desert on Earth)
Human population	~4 million (Inuit, Sámi and other indigenous peoples)	No permanent residents — 1,000–5,000 scientists at research stations
Governance	Divided between multiple nations (Canada, Russia, USA, Norway, Denmark/Greenland…)	Antarctic Treaty 1959 — international agreement; no country owns it
Characteristic animals	Polar bears, Arctic foxes, caribou, ringed seals, walrus	Emperor penguins, leopard seals, Weddell seals, albatross
Land vegetation	Tundra — mosses, lichens, sedges, dwarf shrubs	Almost none — only mosses and lichens on coastal rock outcrops

The single most important contrast: Arctic = ocean surrounded by land. Antarctica = land surrounded by ocean. This explains most of the other differences.