Natural areas of the tropical zone. Which countries are located in the tropical zone? Natural zones of the tropical climate zone

A climate zone is a geographic latitudinal band that differs from neighboring bands in the amount of solar radiation and atmospheric circulation. According to the Alisov classification, thirteen climatic zones (zones) are distinguished: seven main ones with the main influencing air mass of one type and six transitional ones with a change in the prevailing air masses depending on the season. The average position of climatological atmospheric fronts determines the boundaries of the zone: winter - polar and summer - tropical.

Where is the tropical climate zone located?

There are two tropical climate zones: northern and southern. They coincide with geographical ones. They are located between the subequatorial and subtropical zones. Geographically, these are territories located between twenty and thirty degrees north or south latitude.

Characteristics of the tropical climate zone

In a tropical climate it is always warm or hot: the average winter temperature does not fall below fourteen degrees, the average summer temperature is about thirty-three degrees. The predominant winds are the trade winds, which blow throughout the year and turn into monsoons in the Indian Ocean. In winter, cyclones rage in Africa. The rainy period is pronounced. Seasonal temperature changes are pronounced, especially significantly on the mainland.

Tropical climate

Depending on latitude, the tropical climate is divided into trade wind, continental dry, monsoon and mountain monsoon.

Trade wind climate.

It is a tropical maritime climate that dominates the ocean, extending slightly into Central America and the Australian coast to the east. The kingdom of trade winds and anticyclones. Temperatures are moderately high, summer temperatures are within twenty-three degrees, winter temperatures are within thirteen degrees. The annual temperature range is about ten degrees. There is little precipitation, but it is almost always cloudy.

tropical dry

This is a type of climate over the continent with year-round predominance of tropical air. The wind regime is unstable, anticyclones can give way to blurry summer depressions. Captures African, Arabian, Californian deserts. It's dry and cloudless here. Summer is very hot, in some places the temperature rises to fifty-eight degrees (one of the hottest places in the world), on average - about thirty-three degrees.

Winter temperatures are not lower than ten degrees, on average - about sixteen degrees. The annual temperature range is about eighteen degrees, which is considerable for the tropics, and the daily temperature range can reach forty degrees. Precipitation is very rare, but not only dust devils, but also sandstorms are frequent. Coastal deserts are characterized by constant dense fogs with an almost complete absence of precipitation and an almost constant annual temperature range.

Tropical monsoon

Kingdom of the tropical monsoons. Captures the Indian Ocean and part of the Pacific, South Asia, part of and. Over the ocean, the temperature regime is very similar to the equatorial one - the temperature is about twenty-five degrees all year round.

Above the surface of the earth, the annual amplitude, depending on latitude, varies from a very insignificant four degrees in Cuiabá, Brazil, to twenty-four in Shanghai, China. Precipitation is very uneven. Humidity and cloudiness are also seasonal - maximum in summer, minimum in winter. In the Eritrean city of Massawa, the average annual temperature is thirty degrees with an annual range of nine degrees. The typical landscape of this climate is savanna.

Monsoon climate of tropical plateaus

It is a hybrid of climates: highland and tropical monsoon. It covers the Ethiopian and Yunnan-Guizhou Highlands, the Deccan Plateau, plateaus such as Haud, Yata, Marra, Shan, Kasai, Korat, Mato Grosso, Nazca, Kimberley, Atherton, Barkley. Annual temperature fluctuations are about five degrees, daily - about twenty. The absolute temperature on the plateau is much lower than on the plain - in winter it can sometimes snowball, and the temperature can drop slightly below zero. Rainy period in summer.

Precipitation of the tropical climate zone

Since the tropics are a zone of high atmospheric pressure, there is not much precipitation.

In the trade wind climate zone About five hundred millimeters of precipitation falls per year. The exception is places with special orographic conditions. For example, the Waialeale volcano, located on the island of Kauai, is the rainiest place in the world. Rain lasting two hundred forty-seven days is listed in the Guinness Book of Records, the average rainfall is 11684 millimeters, the maximum is 16916 millimeters. These records were set on the windward slope of Waialeale; on the leeward slope only five hundred and sixty millimeters of precipitation falls - twenty times less. In the open ocean, heavy rains are brought by infrequent tropical cyclones, and in the intervals between them it is quite dry, since even with a completely cloudy sky, precipitation does not fall - it does not condense to a sufficient extent.

In a tropical dry climate and precipitation falls from one hundred to two hundred and fifty millimeters, and they are extremely rare. Sometimes all the annual precipitation can fall in one day, for example, in one day of heavy rain in the Sahara, eighty millimeters can fall - almost the annual norm. Sometimes there is no rain for several years. The coasts of coastal deserts such as the Namib, Sahara or Atacama enjoy even twenty millimeters of precipitation per year, most often they do not have even this, but receive moisture from thick coastal fogs.

In the tropical monsoon zone climate, precipitation is distributed extremely unevenly, but the rainy period occurs in the summer. The greater the latitude, the less precipitation. The driest place is the capital of Sudan, Hatoum. Only one hundred and thirty-five millimeters of precipitation falls here per year, with all the rain falling in the summer. India receives the most rain - about five thousand millimeters per year. The exception is the Indian city of Cherrapunji - almost the wettest and rainiest place on Earth. Thanks to the special orographic conditions, precipitation here is 11,777 millimeters per year, almost all of which occurs in the summer.

In the monsoon climate zone of tropical plateaus there is little precipitation - a little more than a thousand millimeters per year with a pronounced rainy period.

Natural zones of the tropical climate zone

Depending on the degree of moisture, semi-deserts, savannas and tropical forests are located in the tropical climate zone.

A significant part of the tropical belt is occupied by deserts and semi-deserts.

Tropical deserts and semi-deserts- dry and hot, their flora and fauna are extremely scarce and monotonous. The desert is not always sand, although in the minds of most people the desert looks like that. Most often, deserts are not sandy, but clayey, sandy-pebble, saline or rocky. Poor desert soils are often saline. After heavy rain, the groundwater level rises. Through soil capillaries, groundwater rises to the surface along with the salts dissolved in them and evaporates, leaving the carried salt on the surface. Permanent rivers in the desert are a rarity. Lakes are also rare, and their water is most often salty. The hot and dry climate of tropical deserts provides an area of ​​constant high pressure with downward air currents. Precipitation is extremely rare and short-lived, although abundant. Often raindrops simply do not reach the surface, evaporating in the air. Semi-desert is a transition zone between desert and savanna. The boundaries between desert and semi-desert, semi-desert and savanna are often blurred, and even ecologists do not always have a unanimous opinion on this issue.

Savannah- This is a hot transition zone between semi-desert and forest. Savannas, like deserts, are different. Depending on the amount of precipitation, they can be woody, tall grass, cereal, or desert. Precipitation in the savanna is strictly seasonal - it rains only during the rainy season. This is why many do not see the difference between savanna and steppe, but it exists. In the savanna, unlike the steppe, not only grasses grow, but also shrubs and real trees, sometimes forming entire forests. During the dry season, the savanna dries out, which provokes fires; during the rainy season, the same areas can become swampy.

Rainforests, depending on the amount of precipitation and the severity of the dry period, are seasonal and wet. Tropical rainforests grow in places without a pronounced dry period. They are mangrove, swamp and evergreen mountain. Seasonal tropical forests, depending on the duration of the dry period, are evergreen, semi-evergreen, light sparse and deciduous. Deciduous forests, in turn, are divided into monsoon, savanna and thorny xerophilic forests.

Nature of the tropical climate zone

The nature of the tropics is surprisingly diverse. There is everything here: seas, oceans, beaches, mountains, gorges, highlands, rivers, lakes, impenetrable tropical forests, savannas, mangroves, volcanoes, deserts. This is where the rainiest and driest places in the world are located. In some places it doesn’t rain for decades, but in other places it rains without stopping for almost a whole year. Somewhere huge trees are lushly overgrown with vines and epiphytes, and somewhere lichen barely survives, somewhere a banyan tree grows, and somewhere a wolffly, somewhere in the river a crocodile is patiently waiting for its prey, and somewhere a small darkling beetle is hunting moisture from the fog. In the tropical zone there are many natural reserves and reserves with unique ecosystems of rare and endemic plants and animals.

Plants of the tropical climate zone

Plants in the tropical zone are very diverse. The species composition and density of vegetation and the uniformity of its distribution depend on the amount of precipitation of a particular tropical region and the presence of a dry period.

The rainforest is home to almost seventy percent of all plants and animals on Earth. No one knows how many tropical plants have yet to be described. This forest is characterized by many layers, an almost complete absence of shrubs, huge grasses (up to the height of modest trees of temperate latitudes), lianas, epiphytes, evergreen trees with characteristic large and hard leaves, caulifloria and ramifloria. A great variety of exotic plants grow here.

Trees: Ravenala (traveller tree), shorea (sal tree), sequoia, cotton tree (ceiba), ant tree, terebuia, guaiac tree, triplochiton, purple tree (amaranth), balsa tree, nauclea, lophyra, gabaurtia, wenge, astronium , dalbergia, African teak, swarzia, quebracho, cocobolo, limba, kumaru, switenia, haya, entadrophragma, pterocarpus, dalbergia, teak wood, berhemia, black poison wood (chechem), cordicia, ebony, jatoba, mangiflera (mango), melon tree (papaya), coffee tree, theobroma (cocoa), persea (avocao), cinnamon, nutmeg, borage tree.

There are relict grass trees: pandanus, dazypogon, baxteria, kingia, xanthorea. Herbaceous plants: bamboo, banana, sesame, sugar cane, cardamom, turmeric, ginger. Lianas: vanilla, pepper (black, African, cubeba), passion flowers (passion fruit, chulupa, granadine, taho). Shrubs: Pimenta officinalis (allspice), Sanse (Japanese pepper). Epiphytes and semi-epiphytes: orchids, many ferns, bromeliads, ficus stranglers (golden, Bengal - banyan), cacti (schlumberga, epiphyllum, hatiora, rhipsalis, chamedorea, hylocereus). Predatory: sundew, butterwort, nepentis.

In the savannahs everything is much more modest. The main plants are hard-leaved grasses. There are much fewer perennial herbs, subshrubs, shrubs, and small trees. All savannah plants are very hardy - they are adapted to drought, fires, and animals. Grasses such as bearded grass, elephant grass, aristida grass, millet grass, and Bermuda grass grow in the savannah. Trees: acacia, combretum, mongongo, medlar persimmon, oil palm, oil tree, pandanus, bauhinia, doum palm, baobab, terminalia, eucalyptus.

In the desert the vegetation is very modest. These are mainly herbs, succulents and halophiles. Succulents: various cacti (pereschia, mauenia, prickly pear, coryphanta, echinocactus, lophophora, mammillaria, obregonia, peleciphora, ancistrocactus, cereus, cypocereus, melocactus, acanthoripsalis, copiapoa, cynthia, parody, carnegia, pachycereus, trichocereus, pterocactus, mau eniopsis), Euphorbia, aloe, Crassulaceae (Aeonium, Aichrizon, Crassula, Echeveria, Graptopetalum, Kalanchoe). Herbs: sandgrass, wheatgrass, millet, triostia, bentgrass. Halophiles: azhrek, sodnik, sarsazan. Endemic and relict plants: velvichia, nara, olives, mastic tree, cypress. Among herbs there are a lot of ephemerals: they only need about two weeks to flower, fully produce and ripen seeds.

Animals of the tropical climate zone

The fauna of the tropics is huge and diverse. The largest and smallest animals live here: ostriches and hummingbirds, elephants and tiny bats.

The fauna of tropical forests is rich in species composition and poor in the number of representatives of each species. Most of the animals here live in the crowns of trees; there are much fewer terrestrial animals.

Animals: alligators, crocodiles, monkeys, elephants, squirrels (including flying squirrels), rhinoceroses, sloths, giraffes, spiny tails, tapirs, deer, pigs, antelopes, otters, mongooses, quillworts, peccaries, insectivores, anteaters, buffalos, lemurs, predators (lions, tigers, fishing cats, jaguars, leopards), hippos, okapi, sloths, aguara, barasigna, manatees, dolphins, dugongs, porpoises, bats.

Birds: parrots, hoatzins, woodpeckers, craxes, hummingbirds, peacocks, toucans, passerines, kalaos, eagles. Reptiles: snakes, chameleons, lizards (agamas, iguanas, geckos). Amphibians: chkrkpakhs, frogs, toads.

Arthropods: insects (termites, ants, butterflies, millipedes, beetles, mosquitoes (culex and anopheles), flies (including tse-tse)), mosquitoes, arachnids (spiders, phrynes, tartarids, ricinules), crustaceans (crabs, shrimp, lobsters) , worms, shellfish, fish (eg mudskippers in mangrove forests).

In savannas, on the contrary, species diversity is much less, and the number of representatives of each species is much greater, and all of them in one way or another are forced to adapt to survive during periods of drought. Large animals migrate to places where there is no drought yet or where there has been miraculous rain, while small animals hibernate. There are many herbivores and predators in the savanna.

Therbivores: elephants, rhinoceroses, antelopes, giraffes, zebras, donkeys. Predators do not allow them to relax: cheetahs, lions, leopards, hyenas, jackals.

Small mammals: meerkats, jerboas, rabbits, hares, pikas, porcupines.

Birds: flamingos, eagles, ostriches, crows, guinea fowl, weaver birds, shrikes, secretary birds, hornbills, bustards, marabou, cranes, peacocks, storks. There are amazing animals: armadillos, aardvarks, pangolins, anteaters.

Insects: ants, termites, locusts, spiders. There are many snakes in the savannas, some poisonous and some not.

Only the hardiest animals live in deserts, capable of withstanding not only prolonged drought, but also large daily temperature changes. Ungulates, rodents, reptiles, spiders and insects survive in deserts. Many animals are forced to be nocturnal.

Mammals: rodents (gerbils, jerboas, hares), ungulates (camels, antelopes, gazelles, mouflons, llamas, zebras, wild asses, rams and goats), predators (hyenas, jackals, coyotes, foxes, cheetahs, lions, leopards, pumas, honey badgers, mongooses, meerkats, hedgehogs), rodents (gerbils, marmots, ground squirrels, mice, lagomorphs, tuco-tuco). Among the birds that live in the deserts of the tropical zone are ostriches, guinea fowl, crows, owls, falcons, vultures, vultures, vultures, bustards, drongos, weaver birds, larks, and hazel grouses. About half of all birds are migratory.

There are many lizards: monitor lizards, geckos, belt-tailed lizards, iguanas, chuckwells, skinks, chameleons. Lots of snakes: cobras, rattlesnakes, vipers. There are arthropods: scorpions, spiders (tarantulas, tarantulas), insects (grasshoppers, locusts, beetles (darklings), flies, fleas, ants, termites, wasps). There are many waterfowl in coastal desert areas, and corals, fish and other marine life in coastal waters.

Countries of the tropical climate zone

The tropical zone covers almost all parts of the world except Europe and Antarctica. Both tropical zones pass through the territory of Africa - both southern and northern.

Africa. Northern tropics. Includes Niger, Algeria, Sudan, Mauritania, Mali, Libya, Chad and Egypt. Southern tropics. Includes Angola, Zambia, Namibia and Botswana.

Asia. Northern tropics. Includes India, Yemen, Oman and Saudi Arabia.

North America. Northern tropics. Includes some regions of Cuba and Mexico.

South America. Southern tropics. Includes Bolivia, Brazil, Paraguay, Peru, and some regions of Chile.

Australia. Northern tropics. Includes central Australia.

1. Tropical zone. In the northern and southern hemispheres, between latitudes 20-30° there is a tropical zone. At the border of this belt in the inner and western parts of the continents, a tropical desert zone has been formed. Famous desert Sahara in Africa is included in this zone.

The climate of the tropical desert zone is very hot and dry. The air temperature rises to +58°C, and the soil surface warms up to +90°C. Precipitation everywhere does not reach 100 mm. There is a period when not a drop of rain falls for several years in a row. Vegetation is very sparse, and in some places it is completely absent. Clay and rocky deserts are especially unsightly. Small vegetation is found along the beds of former rivers, in rock cracks.

Of the plants well adapted to desert conditions, the date palm grows in the oases of the Sahara, and the cactus grows in the deserts of North America (Fig. 88, 89).

Rice. 88. Cactus.

Rice. 89. Date palm.

The date palm puts down its roots to a depth of several tens of meters; the cactus has spines instead of leaves to reduce water evaporation. In North America, a giant cactus grows up to 15 meters high. It accumulates up to 1 ton of water. If you cut a cactus sprig, cut it and chew it, you can completely quench your thirst.

There are a lot of different snakes, lizards, and insects in deserts. Large animals and birds live only near oases.
In the eastern parts of the Australian mainland, deciduous tropical rainforests and tropical dry forests are common.
Rainforests grow in places where there is a lot of rainfall and where the wet season follows the dry season. Trees shed their leaves during the dry season. Evergreens in most cases grow in the lower floors.
In dry forests, trees become thinner. Particularly striking are the eucalyptus forests in eastern Australia.

Rice. 91. Eucalyptus.

Height eucalyptus tree(Fig. 91) reaches 100 m, the bark is thick and fire-resistant, it burns slowly. The tree sheds its bark every year so as not to impede its growth. Delivering water to such a height is not easy. To reduce water evaporation, the leaves are positioned sideways to the sun. Since the crown of the tree is narrow, it provides very little shade. A marsupial bear lives on the branches of a eucalyptus tree - koala(Fig. 90).

Rice. 90. Koala.

Where the climate is drier, tropical savannas are located instead of forests.

2. Subtropical zone. At latitudes of 30-40° in the northern and southern hemispheres, between the tropical and temperate zones, the subtropical zone is located. It differs from the tropical zone by a large change in temperature between seasons. Nevertheless, the average temperature of all months is positive (from +4°C to +20°C).
Therefore, plants grow throughout the year. The climate of all continents of the belt in the western, internal and eastern parts differs from each other. In the western areas near the ocean it forms subtropical dry continental climate with dry summers, wet winters, in the east - monsoon climate with heavy rainfall in summer.
These types of climate correspond to separate natural zones. In the subtropical zone, there are variable-humid evergreen forests, hard-leaved forests and shrubs, deserts and semi-deserts. They have a common feature for all - a warm winter, but in many parts there is a clear difference between the hot summer and moderately cool winter seasons of the year.
The zone of variable-moist evergreen forests is widespread in eastern Eurasia and also persists in southeastern North America and Brazil. These forests are associated with a monsoon climate with dry winters and rainy summers.

The warm subtropical climate is favorable for the growth of evergreen trees with beautiful flowers - magnolia, laurel, beech, cypress. The many ferns climbing on the vine trees make these forests similar to equatorial evergreen forests, growing on red and yellow subtropical soils.

The hard-leaved evergreen forests and shrubs consist of plant species adapted to the Mediterranean climate. They do not shed their leaves even during dry periods and remain evergreen throughout the year. Since the leaves are small, very hard and smooth, the plants evaporate little water.
The nature of subtropical forests has changed greatly under the influence of human activity. Currently, the forests have been cut down and citrus crops, vineyards, and orchards are growing in their place.
Subtropical deserts and semi-deserts form entire stripes on all continents.
According to natural conditions, subtropical deserts are a direct continuation of tropical deserts.

1. On the contour map, mark the tropical and subtropical zones.

2. Using the map, find the largest tropical deserts on the globe.

3. What are the features of deciduous tropical forests?

4. What zones does the subtropical zone consist of?

Geographic zones located in the Northern and Southern Hemispheres between 20° and 30° latitude, where trade wind circulation dominates and large areas are occupied by deserts and semi-deserts... Dictionary of Geography

northern tropical zone- in the Northern Hemisphere, between the northern subtropical and northern subequatorial zones, mostly between 30 and 10° N. w. In the Old World, it is most clearly expressed in Africa, where it occupies vast areas in the northern part of the continent (Sahara, Nubian, ... ... Geographical encyclopedia

southern tropical zone- in the Southern Hemisphere, between the southern subtropical and southern subequatorial belts. It is most widespread over the oceans, where it covers the space from the equator to 30° south. w. On continents it is relatively narrowed, mainly. between 30° and 20° S. sh... Geographical encyclopedia

TROPICAL Ushakov's Explanatory Dictionary

TROPICAL- 1. TROPICAL1, tropical, tropical. 1. adj. to the tropics, located between the tropics. Tropical zone. Tropical countries. 2. Peculiar to the tropics. A tropical forest. Tropical fever (one of the forms of malaria). Tropical climate. 3.… … Ushakov's Explanatory Dictionary

BELT- belts, plural belts, m. 1. A long narrow strip of fabric, cord or belt, used for circular coverage, tying at the waist. Leather belt. 2. The place where the body is covered by this stripe, the waist (colloquially). Tight in the waistband. Waist-deep in water. 3.… … Ushakov's Explanatory Dictionary

Tropical climate- South Florida is in a tropical climate Tropical climate is a type of climate typical of the tropics. According to the classification adopted for climate by V. P. Köppen, it is defined as not ... Wikipedia

Tropical dry climate- Tropical dry climate is a continental variety of trade wind climate, where there is no change in monsoons, that is, where tropical air predominates all year round. The wind regime in these continental regions is not as characteristic and stable as in ... ... Wikipedia

BELT- BELT, ah, plural. a, ov, husband. 1. Ribbon, cord, belt or stitched strip of fabric for tying or fastening at the waist. Leather p.p. skirt. To put someone in the belt and behind the belt. (certainly surpass someone in nothing; colloquial). Plug the ax into step 2. transfer... Ozhegov's Explanatory Dictionary

geographical belt- (physical-geographical belt), the largest unit of the zonal division of the geographical envelope, which has common features of the structure of latitudinal landscape zones, which is determined by the magnitude of the radiation balance. Many geographers identify... ... Geographical encyclopedia

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The air temperature here is constant (+24° -26°C); at sea, temperature fluctuations can be less than 1°. The annual amount of precipitation is up to 3000 mm, and in the mountains of the equatorial belt, precipitation can fall up to 6000 mm. More water falls from the sky than evaporates, so there are many wetlands and dense rain forests - jungles. Remember the adventure films about Indiana Jones - how difficult it is for the main characters to make their way through the dense vegetation of the jungle and escape from crocodiles who adore the muddy waters of small forest rivers. All this is the equatorial belt. Its climate is greatly influenced by the trade winds, which bring heavy rainfall from the ocean.

Northern: Africa (Sahara), Asia (Arabia, southern Iranian Plateau), North America (Mexico, Western Cuba).

Southern: South America (Peru, Bolivia, Northern Chile, Paraguay), Africa (Angola, Kalahari Desert), Australia (central part of the continent).

In the tropics, the state of the atmosphere over the continent (earth) and the ocean is different, therefore a continental tropical climate and an oceanic tropical climate are distinguished.

The oceanic climate is similar to the equatorial climate, but differs from it in less cloudiness and stable winds. Summers over the oceans are warm (+20-27°C), and winters are cool (+10-15°C).

Over the tropical land (mainland tropical climate), a high pressure area prevails, so rain is a rare guest here (from 100 to 250 mm). This type of climate is characterized by very hot summers (up to +40°C) and cool winters (+15°C). The air temperature can change dramatically during the day - up to 40°C! That is, a person can languish from the heat during the day and shiver from the cold at night. Such changes lead to the destruction of rocks, creating a mass of sand and dust, which is why dust storms are frequent here.

Photo: Shutterstock.com

This type of climate, like the tropical one, forms two zones in the Northern and Southern Hemispheres, which form over areas of temperate latitudes (from 40-45° North and South latitudes to the Arctic Circles).

There are many cyclones in the temperate zone, causing the weather to become capricious and produce either snow or rain. In addition, westerly winds blow here, which bring precipitation all year round. Summers in this climate zone are warm (up to +25°-28°C), winters are cold (from +4°C to -50°C). Annual precipitation ranges from 1000 mm to 3000 mm, and in the center of the continents it is only up to 100 mm.

In the temperate climate zone, unlike the equatorial and tropical ones, the seasons are clearly defined (that is, you can build snowmen in winter and swim in a river in summer).

Temperate climate is also divided into two subtypes - marine and continental.

Marine dominates the western parts of North America, South America and Eurasia. It is formed by westerly winds blowing from the ocean to the mainland, so it has fairly cool summers (+15 -20°C) and warm winters (from +5°C). Precipitation brought by westerly winds falls all year round (from 500 to 1000 mm, in the mountains up to 6000 mm).

Continental predominates in the central regions of the continents. Cyclones penetrate here less frequently, so there are warmer and drier summers (up to +26°C) and colder winters (up to -24°C), and the snow lasts a very long time and melts reluctantly.

Photo: Shutterstock.com

Polar belt

It dominates the territory above 65°-70° latitude in the Northern and Southern Hemispheres, therefore it forms two zones: Arctic and Antarctic. The Polar Belt has a unique feature - the Sun does not appear here at all for several months (polar night) and does not go below the horizon for several months (polar day). Snow and ice reflect more heat than they receive, so the air is very cool and the snow does not melt for most of the year. Since a high pressure area is forming here, there are almost no clouds, the winds are weak, and the air is saturated with small ice needles. The average summer temperature does not exceed 0°C, and in winter it ranges from -20° to -40°C. Rain falls only in the summer in the form of tiny droplets - drizzle.

Between the main climatic zones there are transitional zones, which have the prefix “sub” in their names (translated from Latin as “under”). Here, air masses change seasonally, coming from neighboring belts under the influence of the Earth's rotation.

a) Subequatorial climate. In summer, all climatic zones shift to the north, so equatorial air masses begin to dominate here. They shape the weather: a lot of precipitation (1000-3000 mm), average air temperature +30°C. Even in the spring the sun reaches its zenith and burns mercilessly. In winter, all climatic zones shift to the south, and tropical air masses begin to dominate in the subequatorial zone; winter is cooler than summer (+14°C). There is little precipitation. The soils dry out after summer rains, so in the subequatorial zone, unlike the equatorial zone, there are few swamps. The territory of this climatic zone is favorable for human life, which is why many centers of civilization are located here.

The subequatorial climate forms two zones. The northern ones include: the Isthmus of Panama (Latin America), Venezuela, Guinea, the Sahel desert belt in Africa, India, Bangladesh, Myanmar, all of Indochina, Southern China, part of Asia. The southern zone includes: the Amazonian lowland, Brazil (South America), central and eastern Africa and the northern coast of Australia.

b) Subtropical climate. Here tropical air masses predominate in summer, and in winter - air masses of temperate latitudes, which determines the weather: hot, dry summers (from +30°C to +50°C) and relatively cold winters with precipitation, and no stable snow cover is formed.

c) Subpolar climate. This climate zone is located only on the northern edges of Eurasia and North America. In summer, humid air masses come here from temperate latitudes, so summers here are cool (from +5°C to +10°C). Despite the small amount of precipitation, evaporation is low, since the angle of incidence of the sun's rays is small and the earth does not warm up well. Therefore, in the subpolar climate in northern Eurasia and North America there are many lakes and swamps. In winter, cold arctic air masses come here, so winters are long and cold, temperatures can drop to -50°C.

The tropical climate zone is one of two geographical zones on the globe. The tropics are located in the Northern and Southern hemispheres of the Earth between the subequatorial and subtropical zones from 20 to 30° N latitude. and S. Tropical zones cover certain areas on all continents except Antarctica, including the territory of countries such as Australia, Algeria, Egypt, China, Libya, UAE, Taiwan, Chile, Brazil, Vietnam, Hawaii, Maldives, Oman, Nigeria, Thailand, etc. The tropical climate has characteristic features over the oceans.

Climatic conditions are formed under the influence of tropical air masses, which are characterized by high atmospheric pressure and persistent anticyclonic air circulation, light cloudiness, low relative air humidity, and low annual precipitation. Seasonal temperature changes are pronounced over the continents. The prevailing winds are trade winds - constant winds from the east.

Average annual temperatures

The average annual temperatures of the warmest months are 30-35°C, the coldest months are at least 10°C. The maximum temperature was recorded at 61°C, the minimum – 0°C and below. The average annual precipitation ranges from 50 to 200 mm. In the eastern oceanic region alone, up to 2000 mm of precipitation can fall per year.

The territory lying in the tropical zone is conventionally divided into four regions:

1. Eastern Oceanic (with high humidity and dominant forest areas);

2. Eastern transitional (with a predominance of shrubs and woodlands);

3. Inland;

4. Western-oceanic (with a predominance of deserts and semi-deserts).The latter region experiences high relative humidity with frequent fog and relatively stable temperatures.

Continental areas located in the tropical zone are characterized by changes in natural processes when moving from east to west: the runoff layer becomes less abundant (from 100 mm to 2-10 mm) and the water content of rivers decreases (eastern rivers are constantly full-flowing, western rivers are periodically).

To the east, erosion processes and chemical weathering are predominant, to the west and in the inland region - deflation and physical weathering. From east to west, the thickness of the soil cover decreases; inland and western regions are characterized by desert soils with a primitive composition (gypsum, carbonate, solonchaks), which alternate with sands and accumulations of rubble. Also, the types of plant communities change from east to west: mixed evergreen forests are replaced by monsoon deciduous forests and then by savannas or open forests, dry forests, shrubs, semi-deserts and deserts. Accordingly, the composition of the fauna changes - from many forest inhabitants to rare inhabitants of desert areas.

From east to west, the following zones of the tropical zone on land are distinguished: zone of tropical rainforests, zone of open forests, zone of savannas and dry forests, tropical semi-deserts and deserts. Mountainous areas are characterized by altitudinal zones.

Areas of continents with a tropical climate are poorly developed and populated by humans, except for the eastern regions of the continents. In the eastern oceanic region, agriculture and forestry are developed, in the western oceanic and inland region - pasture cattle breeding with areas of irrigated agriculture, as a result of which natural landscapes are almost completely transformed in the process of human economic activity.

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