CLIMATE AND NATURAL REGIONS
World Climatic Types and Their Characteristics.
The world climatic types on the basis of temperature are classified into four basic types;
i. HOT CLIMATES
Is the climatic type of the world characterized by mean annual temperature which is over 21ºC and have the following natural vegetation; Equatorial Forests, Monsoon Forest and Tropical Grassland scrub e.g Equatorial, Tropical Desert, Monsoon and Marine areas.
ii. WARM CLIMATES
Is the world’s climatic type whereby no month has the temperature of less than 7ºC and have the following natural vegetation, Evergreen Woodland and Grassland Temperate Forest e.g West Margine and China Type.
iii. COOL CLIMATES
Is the world’s climatic type whereby one to five month have temperature below 7ºC and have the following natural vegetation; Temperate Forest, Grassland and Scrub e.g British Type, Cool Temperate Interior and Laurentian Type.
iv. COLD CLIMATES
Is the world’s climatic type whereby six months or more have temperature below 7ºC and the natural vegetation are Nil, Mosses, Linchen and Coniferous Forest e.g Polar, Tundra, West Margine,etc.
FACTORS INFLUENCING CLIMATE
The characteristics of various type of climate are a result of the following factors;
-Influences temperatures on the surface of the earth whereby the areas nearer to the Equator experience higher temperature than those far away.
-Shifting of the overhead position of the sun is determined by latitudes and has an influence on climate.
-Influences temperature and pressure of a region.
-Low altitude regions are warmer and experience high atmospheric pressure while high altitude areas are cooler and have low pressure.
c) Distance from the sea
-Has an influence in both temperature and rainfall of a region. During summer onshore winds have cooling effect on the land which is warm.
-During winter the sea is warmer than the land.
Aspect refers to the direction in which a slope faces e.g in The Northern Hemisphere, the Southern ward slopes are warmer than the North ward facing slopes. This is because the North slopes never receive direct sunshine as the sun in this region never gets over head.
-Windward slopes of highlands receive much higher rainfall than the Leeward slopes.
e) Ocean Currents
Current flowing along the Coasts tend to modify the climate of the Coastal regions. Where onshore wind blow over a cold ocean current are cooled from the below and the moisture they are carrying is condensed and dropped over the sea as rain.
f) Prevailing Winds
Wind is a medium of transfer of heat and moisture over the land. If wind is blowing from a warm region, it has the warming effects over the region it is blowing across and if wind will blow from cold region it will be cold and will cool the land over which it is blowing.
g) Human Activities
Like development of settlements, agriculture and construction of dams and creation of man made lakes have influence on climate. In recent times we are realizing the effects of human activities in causing climate change, caused by clearing of forests , draining and cultivating swamp areas, emission of Chlorofluorocarbons and other gases from factories and motor vehicles.
NATURAL REGIONS OF THE WORLD
Natural Regions are geographical areas with uniform physical characteristics that distinguish it from other natural regions.
CHARACTERISTICS OF THESE REGIONS
– They experience similar problems.
– They have same geographical back ground.
– Are unified by the same certain latitudes which help in locating them over.
– Tend to have almost the same type of soil and vegetation cover.
– They have the same occupation such as a mining, agriculture and animal husbandry.
TYPES/ CLASSIFICATIONS OF NATURAL REGIONS
1. Equatorial Regions.
2. Tropical/savannah Region.
4. Hot Desert.
5. Warm Temperate Interior Region.
6. Cold Temperate Continental Region (SIBERIAN TYPE).
7. Cool Temperate West margin Region (BRITISH TYPE).
8. Cool Temperate Eastern margin Region (LAURENTIAN TYPE).
9. Warm Temperate Eastern coast margin Region (CHINA TYPE).
10. Monsoon Region.
12. Tundra and Polar Region.
1. EQUATORIAL REGIONS
Location: The religion is found between 0° – 5° North and South of the equator.
Area found: west coastal Nigeria S.W and S. Central Ghana, Congo, and Amazon basin / East Indies.
Characteristics of Equatorial
– High temperature about 27°c throughout the year.
– Annual temperature range is 2°c.
– Rainfall is heavy throughout the year.
– The Annual rainfall is about 2000mm.
– There are no seasons of the year.
– Type of rainfall is convectional.
Crops grown are cassava, groundnuts, maize, millet, beans, bananas.
Plantation agriculture, fishing, cultivation, peasantry sedentary agriculture.
Common animals found
Monkey, gorillas, crocodiles, and hippopotamus.
2. TROPICAL REGION /GRASSLAND/SAVANNAH/SUDAN TYPE
Location: the region is found between 5° – 20°North and South of the equator Between equatorial and tropical desert.
Area found: East and Central Africa, Brazilian plateau, Venezuela, Africa and N. Australia.
Climate: hot wet summer season, warm dry winter, rainfall is moderate. Torrential rainfall associated with thunderstorms in annual range of temperature increases with the distance from equator.
CHARACTERISTICS OF TROPICAL REGION
-High temperature range from 20°c – 32°c.
-Temperature range is 8°c.
Total rain varies from 500mm to 1500mm.
Vegetation: tall grasses which lie dormant in dry season e.g Miombo, palm, acacia,gum tree.
Human activities: Livestock keeping and cultivation.
Animals found: Lion, leopard, zebra, giraffe.
crops grown: cotton .
3. MEDITERRANEAN REGION
It is found between 30° – 45° North and south of the equator around Mediterranean ocean only.
– South Eastern Australia, central Chile, central California, north and South America.
CHARACTERISTICS OFMEDITERRANEAN REGION
– Mean temperature is about 20°c – 25°c.
– Annual temperature rainfall is about 500mm to 760mm.
– Has two (2) types of climatic conditions (season) per annual.
– They face problems like TSUNAMI.
– Type of rainfall is cyclonic rainfall.
– The climatic condition is dry in summer and cool wet in winter.
– It is a coastal belt region.
– Rain has 2 seasons, not throughout the year.
– Elephant, rhino, zebra, lion, buffalo.
– Tourism, agriculture, fishing and navigation.
– Crops are wheat potatoes, vegetable, maize and fruit cultivation, as orange, lemon and grape fruits.
4. HOT DESERT
It is located between 15° – 30° latitudes North and south of the equator.Hot Desert of the world are Sahara, Kalahari, Attacama and Namib desert.
CHARACTERISTICS OF HOT DESERT
– Very high temperature of about 40°c during day time.
– There is very little rainfall usually less than 250 mm a year
– There is no complete cover of vegetation on the land because is too scanty.
– It consist mostly of thorny club bushes and cacti tropics.
Crops grown are dates, palm, cotton, rice, tobacco,fruit tree and tomato.
– Trading, mining, low agriculture over irrigation around coastal areas.
5. WARM TEMPERATE INTERIOR REGION (STEPPE TYPE)
Location : it is located 20° – 35° North and South of the equator.
Australia, Argentina, Mexico, USA (Oklahoma, Texas, place of Manchuria).
CHARACTERISTICS OF STEPPE TYPEREGION
– Short warm summer and long cold winter.
– Two seasonal in the year.
– Rainfall is very little because of the dry winds (winds without moisture).
– Type of rainfall is conventional rainfall caused by low pressure system.
– Total annual rain 380mm -700mm, depending on distance of the sea.
– Temperature range from 15ºc- 25ºc depending on place location.
– Maximum temperature during daytime exceed 30ºc.
– When temperature falls less than Oºc the land is covered with ice (snow).
– The area experience low rainfall in general which form in spring and early summer.
– Animal rearing ( cattle and sheep ranching ) to large grassland.
– Agriculture, main crop cultivate is wheat, maize, linseed.
– Mining in grassland (coal, oil, and iron ores).
– Environmental pollution (air) due to industries.
– Snow fall destroy crops.
– Floods, soil erosion.
– Dust storm, thunderstorms.
– Drought condition.
6. COLD TEMPERATE CONTINENTAL REGION (SIBERIAN TYPE)
Northern hemisphere along 60ºN in Europe, Asia and Northern America.
CHARACTERISTICS OF SIBERIAN TYPE
– Short warm summer season, long cold winter season warmest month reached about 30ºc.
– Annual temperature range is 37ºc very high due to distance from the sea.
– Minimum temperature during night may be less than 40ºc.
– Most rain falls in summer associated with thunderstorms.
– Type of rain is convectional rainfall.
– Average rainfall is 500mm.
– Coniferous forest ( but fewer than in equatorial climate).
– Trees are evergreen; leaves are needle shaped, thick and leathery in order to reduce loss of moisture by transpiration.
– Conical shaped trees do not permit the accumulation of snow.
– Mining and trapping.
– Coarse, infertile soil which do not favor agriculture. Agriculture is rarely practiced due to short time of grow season.
– Animal have short ears and tails, fur so as to adapt to seasonal changes (e.g. moose , caribou fox).
– Glacial erosion.
– Soil infertility.
– Frost destroys crops.
– Environmental pollution.
7. COOL TEMPERATE WEST COAST MARGIN REGION (BRITISH TYPE)
It is located in Western sides of continents between 45º-60ºN and S of the equator.
-Northern Western Canada, Coast of South Chile and Southern Island of New Zealand.
CHARACTERISTICS OFBRITISH TYPE
– Type of rainfall is cyclonic and orographic which is distributed throughout the year.
– Total annual rain is 760mm but varies with distance from sea.
– Windward slopes receive heavier rain than leeward slope.
– Coastal regions are in oceanic influence (near the ocean).
Deciduous trees are dominant (but are cleared to allow farming).
– Main activity is mining and manufacturing industries.
– Few people practice agriculture in Northern Europe.
– Cattle, sheep, growing wheat and fruit develop in farming.
– Availability of coniferous trees/forests encourages lumbering activities.
– Deforestation due to lumbering, overgrazing.
– Establishment of settlement and cultivation.
– Water,air,soil pollution (also water borne diseases due to water pollution).
– floods due to poor drainage,soil erosion.
– Earthquake and volcanic eruption that affect coast lands destruction of properties.
– Soil leaching,soil acidification and decline of soil fertility.
8. COOL TEMPERATURE EASTERN MARGIN REGION (LAURENTIAN TYPE)
It is located on eastern side between 35° and 50° Northern and Southern Hemisphere.
East Canada, north china, Korea, north Japan, England, USA.
CHARACTERISTICS OF LAURENTIAN TYPE
– Two (2) seasons per year warm in summer and cold in winter. Rain throughout the year.
– Summer temperature , range from 12°c – 18°c.
– Annual range is high in summer about 25°c, it differs in America 25°c and in Asia 29°c.
– In winter low temperature range 10°c – 4°c, in America and 15°c – 4°c in Asia.
– Cold winds carry moisture , they blow outward from interiors which are responsible for low winter temperature.
– Winds in North America are warmed by Great lakes which results in heavy snow falls in Eastern Canada (Great lakes influence the climate).
– Precipitation is in the form of snow falls and rain in Southern America and Northern Japan.
– Total rain is 550mm to 1000mm annually.
– Rain is convectional and cyclonic.
– Coniferous forest found in areas with high rainfall.
– Northern hemisphere there are deciduous trees.
– Farming (USA – mixed farming , Canada – fruit trees).
– Manufacturing industries.
– Mining activity in America and Asia ( minerals extraction).
NB. In Asia crops as wheat, maize and soya beans grown intensively.
– Snow fall destroys crops.
– Butter cold winter cause frost formation.
– Environmental pollution.
– Glacial erosion.
– Stormy condition.
– Dense fogs which hinder effective visibility.
– Volcanic eruptions and earth quakes e.g. In Japan Tsunamis.
– Decline in fertility,deforestation.
– Soil acidification.
– Loss of biodiversity.
9. WARM TEMPERATE EASTERN COAST MARGIN (CHINA TYPE)
It is located in the Eastern side of the continents between 23° – 35° north and south of the equator.
South Eastern USA, East central China and Eastern part of Argentina, S.E Australia and S.E Africa.
CHARACTERISTICS OFCHINA TYPE
– 2 season, summer and winter.
– Hot summers with temperature about 26°c and 13°c during winter.
– Trade winds are dominant seasonal winds they blow on short and bring convectional type of rainfall.
– Most rain takes place in summer. in winter rain is light.
– Annual total rain is 1000m.
– There are variety of soil type depending on location and topography.
– A long coast the soil is sandy, loam, silt and clay.
– Beneath deciduous forest soil are called alfisols, rich in plant nutrients due to humus created by fallen leaves of deciduous tree.
– Also there is peddlers and volcanic soil.
Volcanic eruption and earth quakes which bring valuable minerals near the surface.
Mining – Recreational centers ( camp, climb, ski).
Pastoralism – Manufacturing of HEP.
Tourism – Employment to people in HEP power plants.
Transhumance – seasonal movement of animals to the valleys and to the uplands. People take animals to the upland pastures which are free from snow in summer and brought back to the valleys during winter.
– Drought condition in the leeward side due to rain shadow effect.
– Soil erosion.
– Land slides.
– Avalanches in snow cover.
– Deforestation ( because of lumbering and settlement).
– Water population.
– Flooding in lowlands.
– Earthquakes and volcanic eruption.
– Global warming that leads to melting of attractive snow
10. THE MONSOON REGION
Is the area in which its climate is influenced by wind that blow from one direction in one season and another direction in another season.
It prevails mainly in Indian Ocean.
India, Burma, china ,Indonesia, N. Australia, southern Horn of Africa.
Characteristics of monsoon region
– Receives rainfall in different amounts from place to place.
– Wind blows from south –West in April – October.
– Deciduous trees/forest in low lands and coniferous forests in highlands.
– Flowering shrubs and bamboos are common
– Good temperature and rain makes it possible for growing crops throughout the year.
– Dairy farming.
– Agriculture ( maize , tobacco, and cotton, in S.E USA and paddy in china).
11. THE MOUNTAIN REGION
Location: found mostly in areas where young fold mountain is obtained such as Himalaya, Alps Rockies and Andes.
S. Europe central Asia, N. E Africa, E Australia and N & S of America.
CHARACTERISTICS OF THE MOUNTAIN REGION
– Temperature of air drop as altitude increase.
– When the warm moist air moves up the windward slope of mountain it cools and water vapour condenses into water droplet, which then fall as rain or snow on the windward side
. The dry area (leeward side) which is away from wind is called rain shadow.
– Precipitation increase when altitude increase, it is called relief or orographic precipitation.
-Types of rainfall is orographic or relief rainfall.
Only few living things survive in the bitter cold of snow. Just below snowfield a variety of small animals are found.
It has unfavorable for human settlement. The in habitats are ESKIMOS of N. America, Yakutsk , Lapps of Scandinavia and Samoyed of Siberia.
– Rearing of vender.
– Severally cold condition.
– Snow fall and snow cover.
– Frozen soil that hinder cultivation.
– Environmental pollution.
– Avalanches in mount onerous region.
– Shallow soil.
– Sub glacial desert.
– Glacial erosion.
Eskimos use clothes made of fur and polar deerskin.
– In winter they live in house made up of ice blocks known as IGLOOS.
– In summer they live in tents made up of wood and deerskin.
– They use canoes called KAYAKS for transport.
12. TUNDRA AND POLAR REGIONS
(a) TUNDRA REGION
Location: Lies beyond latitude 600 N & S.
Areas found: N. Siberia, Russia and N. Canada.
Characteristics of tundra region
– Short cool summer and long cold winter.
– The annual range temperature varies from 290c to 500c.
– Nights are long and day are short.
– Snow covers the land for 9 months during the year.
– Mosses , lichens sedges and grasses.
– Arctic scrub vegetation on southern parts.
– Tundra stands for region with low vegetation cover.
(B). POLAR REGION
Location: Large parts of Greenland, Antarctica and interior of Iceland. It lies for away from Equator.
CHARACTERISTICS OF POLAR REGION
– Temperature below 0°c due to effect of cold polar. Continental mass.
– Also known as ice cap climate.
– Receives sun rays at low angle.
– Low temperatures.
– Winters are extremely very long and cold.
– The region experiences continuous darkness since it is inclined far from the sun.
– Summer are quite cool and highest temperature hardly exceed 100c opposite direction North- East from October to April.
– South – West / summer monsoon is accompanied by heavy rain.
– Climate is characterized by heavy daily rainfall.
– It various with amount of rainfall.
– Areas with heavy rain more than 2000m, consist of dense forest with big trees (teak and tropical cedar).
– Area with 1000mm- 2000mm, rain less dense forest, sandal wood and iron wood trees.
– Farming ( rice, millet, wheat , maize).
– Land degradation.
– Heavy annual flood.
– Destructive heavy rains.
– Earthquakes due to tectonic plate movement.
– Drought condition in some areas.
– Leaching of soil.
WORLD MAP SHOWING DIFFERENT NATURAL REGIONS