High latitude

High latitude geographical sense refers to the earth's surface and latitude 60 degrees to the area between the north and South poles. The surface of the earth is accepted solar radiation The weakest Zone . The special geographical position in high latitude regions, result of its physical properties and chemical properties and other latitudes were significantly different. The differences in climate, natural environment and other geographical factors significantly. Relatively few natural resources and biological resources. Human activities in areas other than the more desolate.
High latitude

High latitude Definition

High latitude geographical sense, generally refers to earth The definition of human surface latitude. It is an important reference for describe the distribution of solar radiation
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Language. from solar radiation The trigger atmospheric circulation , Mesh belt The phenomenon, is the important content of the nest, thus formed a variety of climate change and other phenomena, is an important task for the reaction. In order to understand the surface position of the earth, people often need to use the expression of high latitude Geographical phenomenon Understanding. People generally think of the earth's surface of three parts according to the latitude latitude. The degree of latitude equator To the north and south latitude 30 degrees range is called the low latitude, 30 degrees to 60 degree range called Mid latitude . High latitude is from the north and south latitude 60 degrees to 90 degrees north and South Pole range two. One of the main features of the high latitude geographical climate is particularly cold, due to various landform phenomenon such as glaciers in the Antarctic, special biological etc.. In addition, "White night The phenomenon of.

High latitude climate

Because at high latitudes solar radiation Relatively small, cold climate, the formation of the surface of the earth is cold. The main climate The subarctic coniferous forest climate , Polar Climate Etc.. The subarctic coniferous forest called subpolar climate Continental climate That is mainly distributed in the The Eurasian continent And North America north latitude of about 50 degrees north latitude north to 55 degrees or 65 degrees around the area. In the air The water vapor content Not much, evaporation and weak, it still belongs to the humid climate. Precipitation concentrated in the summer because of summer high temperature, more water vapor content in the air, there are Cyclonic rain and Convective rain Winter; low temperature, water vapor content, but also by the sinking of the mainland Anti cyclone Control, so the winter precipitation. The subarctic coniferous forest climate rich in forest resources, Chang Linzhu developed industry.

High latitude Polar Climate

arctic ocean and
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Around the polar Asia, Europe and North America continental margin The region and the continent of Antarctica and the continent ocean area climate. The main feature of the year is low, trees can't grow. The northern hemisphere, the northern limit of tree growth, as the south polar climate.
Most of the Arctic continental permafrost surrounding waters. The winter half year Night During the day, due to the underlying surface Long wave radiation That led to a strong cooling. Summer half year Polar day During the period, although from solar radiation The heat, but the main consumption in the summer ice melt is still low. Only in parts of the continental margin, summer temperatures can reach 0 degrees above C, but still below 10 DEG C, the growth of these areas Moss and lichen A class Lower plants It is also known as. Tundra climate (
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Amount to Cobain climate classification The ET type); the rest of the Arctic, the temperature is below 0 DEG C, or called tundra climate Permafrost climate (EF is equivalent to the Cobain climate classification). stay Night During the period from 1 to March, the temperature is almost the same, showing a shape in the annual variation curve of the valley. The whole area of the annual temperature in
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40 ~ C (winter) to 0 C (summer) between changes, which is close to the Atlantic in Europe The Arctic The most warm (for example, port Green in Norway in March July is -19 ~ C, 5 ~ C, annual rainfall of 320 mm) and other polar regions in January the average temperature is lower than -30 DEG C. The Arctic precipitation is small, but because of Cloudiness More evaporation is weak, easy to form land Swamp .
The Antarctic Antarctic plateau is covered with deep snow all the year round, is the world's coldest continent (EF equivalent to the Cobain climate classification). Polar high Over the years, the whole. net radiation In addition to the limited areas are negative The characteristics of the formation of cold climate, humidity. In the vicinity of the coast and the Antarctic Circle, the annual average temperature is about 10 DEG C, the inland areas as low as -50 ~ -60 ~ C. In the East, has been observed in -88.3 ~ C (August 24, 1960) the extreme minimum temperature. The annual precipitation, from the coast to the inland by an average of about 120 mm. The Antarctic region cyclone Activity mainly occurred in the mainland around the ocean, only in some areas, the west side of the cyclone was further inland. Since the mainland central air outflow, in coastal areas The annual average wind speed Reached 15 ~ 20 m / s.. Because all frozen cold, in addition to the scientific expedition to Antarctica, has not settled.

High latitude Features

High latitude Main features

The long cold winter months, the average temperature is 0 DEG C; summer short warm, monthly average temperature more than 10 DEG C. The annual rainfall of 300 to 600 mm
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M, the relative humidity is high. annual temperature range Big. This area is Polar continental air The source and the high latitude winter night long, The height of the sun at noon Small angle, snow covered, Ground radiation Cooling is intense, not affected by Marine air mass Regulation. It extends a wide band, the long and cold winter; warm season is short, especially large temperature. Focus on precipitation is scarce. Summer However, low temperature, weak evaporation, relative humidity is very high. natural vegetation Coniferous forest.

High latitude Cause of formation

By the year Polar continental air And the polar maritime air impact, but also by the winter arctic air mass Influence。

High latitude Animals and plants

High latitude distribution

Subarctic coniferous forest Animals and plants are cold larch , Spruce etc. Conifer That leaves a slender needle, with very thick Cuticle For the world, an important timber tree species. The other species is single, unlike tropical rainforest plant species that are. How long the animal very thick fur, such as the bear, fox, Squirrel Etc.. The typical animal reindeer, Sable Etc..
North America: from Alaska The Labrador and Canada to Newfoundland Most of the area.
From the distribution of the Eurasian continent: Scandinavian Peninsula North to the East Finland And the former Soviet Union (South West along the Leningrad - Gorky City - Swerdlow J's line) and the former Soviet Union in the East (South), north to the annual potential evapotranspiration and 350mm Long cold polar climate Boundary.

High latitude Natural zone

Subarctic coniferous forest . The growth in the subarctic coniferous forest The subarctic coniferous forest climate Take, such as the Eurasian continent and the northern part of North America, north latitude 50 degrees to 55 degrees or 65 degrees around the area.

High latitude Significant City

Yakutsk, Verkhoyansk Womi, Lynn fort.