Antarctic and Arctic - a Comparison, Similarities and Differences
While the polar
regions have many similarities, they are also "polar opposites"
metaphorically as well as literally in many ways.
1/ The Poles
The North Pole is a point in the Arctic Ocean around 700km (430 miles) north of the northern tip of Greenland, the closest land. The ocean is 4,261m (13,980 feet) deep at that point. It is permanently covered by sea ice though the sea-ice is always moving at a speed anywhere from a snails pace to a brisk walk. If you stood at the north pole, you would be anywhere from about 30-100cm (1 - 3 feet) above sea level.
The South Pole is a point on the great ice sheet of Eastern Antarctica at a height of 2,835m (9,300 feet) above sea level and around 1,300km (800 miles) from the nearest open sea at the Bay of Whales. Altitude sickness is a possibility at the south pole. The ice at that point stretches down to almost sea-level being about 2,700m (9,000 feet thick), this is partly because the weight of the ice depresses the bedrock into the earth's mantle. The ice is moving at the south pole at a speed of about 10m (33 feet) per year. There is a ceremonial south pole which is repositioned every year on the first of January to allow for the fact that it has moved since the previous year.
Light and dark. At the north pole the sun is continually above the horizon from around the March equinox to the September equinox reaching a high point of 23.5° at the summer solstice around June the 21st. From September to March it is continually below the horizon. There are a few weeks of twilight before the sunrise and after the sunset while the sun is just below the horizon.
The south pole has the opposite to this with the sun at its highest around the 21st of December. Thus there is effectively one period of daylight at each pole that lasts 6 months followed by one period of night that lasts 6 months.
The Arctic region contains a wide range of landscapes, plains, mountains, some very large significant rivers and lakes, rolling hills, huge stretches of tundra and the edge of the largest biome in the world, the taiga.
The ice in the Arctic Ocean is largely formed from the frozen sea and contained by the surrounding land masses. It contains a large proportion of multi year sea-ice that is 3-4m (10-13 feet) thick with some much thicker ridges. Greenland has the largest ice cap in the Arctic, other than this permanent ice is quite rare and relatively small in extent. Ice bergs form from the Greenland ice sheet, most of the ice in the Arctic even in the summer is frozen sea ice.
Antarctica is 98% covered in ice which means that away from coastal regions (and even including many coastal regions) the landscape is icy mountains, glaciers or smooth ice-sheet. There are no significant rivers and none that flow year round, lakes are small, rare and often permanently frozen over, there is very little land vegetation, and no grassland, shrubs or trees. There are small areas of tundra on the Antarctic Peninsula and larger expanses on a number of Antarctic and sub Antarctic islands (though nothing like the area found in the Arctic).
The total area of Antarctica approximately doubles each winter as sea-ice forms around the coasts, in the summer this ice breaks up and drifts north mainly melting as it does so, Antarctic sea-ice is therefore mainly first year ice. The great ice sheets of Antarctica calve enormous ice bergs into the sea that are measured in square miles (sometimes hundreds or thousands of them), much of the ice in Antarctic waters especially in the summer is freshwater ice from glaciers and ice sheets.
The climate of both polar regions consists of long cold winters and short cool summers (or at least less cold than the winter) there is a spring and autumn (fall) but if you blink you might miss them. You could say that there are two seasons, one cold and bright, the other colder and dark.
The Arctic is not as cold as the Antarctic for two main reasons, firstly the effect of the sea that doesn't fall below -2°C which means that the whole of the arctic polar region and coastal regions are kept relatively warm even though the sea is covered by ice. Secondly, Antarctica is the highest of all the continents at an average height of 2,300m (7,546 feet or 1.4 miles) more than twice the average height of Asia, the next in line and 3-6 times as high as the other continents. Temperature falls as altitude increases at the rate of about 1°C per 100m.
There is also an effect that the weather in Antarctica is driven round and round the continent by circumpolar winds and currents so keeping it within Antarctica, whereas the weather in the Arctic spills out to the south and weather from the south spills into the arctic, this adds to Antarctica being colder than the Arctic as it keeps its cold to itself rather than swapping it with nearby regions.
It is difficult to try and give figures for how cold each pole is as they are so vast and have different temperatures in different regions. As an indication, the temperature at the north pole in the winter (January) varies from about -43°C to -26°C (-45°F to -15°F), while the south pole (winter) it will be between about -62°C to -55°C (-80°F to -67°F). The highest temperature recorded at the north pole is +5°C (+41°F) while at the south pole it is -13.5°C ( +7.7°F).
The coldest temperature
ever recorded on earth was -89.2°C (-128.6°F) on July
21st 1983 at the Russian base at the Southern Geomagnetic Pole in
Plant life in the Arctic
is characterized largely by what grows on the tundra,
a vast low growing treeless area of approx. 11.5M km2
that is mainly underlain by permafrost. There are low shrubs (as
tall as 2m (7 feet) in rare places) sedges, grasses, mosses and
liverworts as well as an extensive variety of alpine type flowering
plants and many lichens. There are about 1,700 species of plants
that live on the tundra in all. The tundra can support many larger
herbivores including reindeer, musk ox, lemmings, arctic hares and
squirrels. To the southern edge of the arctic, the tundra can have
plant cover of 80-100%, further north, plant coverage can be 0%
or just a few hardy alpines in sheltered microclimates.
Often where plants are found growing in Antarctica, they are sparse and irregularly spaced.
Both the Arctic and Antarctic have highly productive
seas the production being driven by phytoplankton. Upwelling currents
bringing nutrients with them and long days in the summer months
drive this production.
The Arctic has many large land animals including reindeer, musk ox, lemmings, arctic hares, arctic terns, snowy owls, squirrels, arctic fox and polar bears. As the Arctic is a part of the land masses of Europe, North America and Asia, these animals can migrate south in the winter and head back to the north again in the more productive summer months. There are a lot of these animals in total because the Arctic is so big. The land isn't so productive however so large concentrations are very rare and predators tend to have very large ranges in order to be able to get enough to eat in the longer term.
There are also many kinds of large marine animals such as walrus and seals such as the bearded, harp, ringed, spotted and hooded. Narwhals and other whales are present but not as plentiful as they were in pre-whaling days.
The largest land animal in the Antarctic is an insect, a wingless midge, Belgica antarctica, less than 1.3cm (0.5in) long. There are no flying insects (they'd get blown away).
There are however a great many animals that feed in the sea though come onto the land for part or most of their lives, these include huge numbers of adelie, chinstrap, gentoo, king, emperor, rockhopper and macaroni penguins. Fur, leopard, Weddell, elephant and crabeater seals (crabeater seals are the second most populous large mammal on the planet after man) and many other kinds of birds such as albatrosses and assorted petrels. There are places in Antarctica where the wildlife reaches incredible densities, the more so for not suffering any human hunting.
There are many indigenous peoples who live around the Arctic. There are representatives of many different groups such as the Inuit, Chukchi, Sami, Yupik, Inupiat and others. The presence of humans is one of the biggest differences between the two poles. Typically the people who live in the far north are nomadic and are hunter/gatherers with the emphasis on hunting rather than gathering, though the Sami people of Scandinavia amongst others are reindeer herders.
The presence of people in the arctic due to easy overland access from the south has influenced the region enormously and it has been inhabited for several thousand years. There are many villages, towns and cities dotted around the Arctic the largest being Murmansk with 325,100 inhabitants the next largest being 135,000, 85,000, 62,000, 58,000 and so on.
Arctic Permanent population - 4 million
Antarctica has never had any native people living there. No one set eyes on Antarctica until 1820, the first human foot stepped ashore a year or two later and it was 1898 before people stayed ashore for a whole year. Other than temporary sealing and whaling stations in the early days, Antarctica has only ever been habited by scientific stations and their personnel who only stay for a year or two. There are still no real native Antarcticans who were born there and have always lived there and always will.
The largest habitation is the American base at McMurdo with 1,000 people in the summer, though only 250 in the winter. Over the whole of Antarctica there are around 4-5,000 summer visitors at scientific stations with about 1,000 of them remaining for the winter. They are greatly outnumbered by ships which bring 30-40,000 tourists each summer for typically 10-14 days each, though are not there at all in the winter.
Antarctica permanent population - 0, Seasonal: Summer - up to 45,000 Winter - 1,000
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