Types of winds, causes of wind formation. Wind and its types Permanent types of winds on earth

PERMANENT WIND - a wind that maintains its direction and speed over time if within two minutes its direction changes by no more than one rumba. There are winds of different constancy: in speed - smooth, gusty (by spirits), squally (holomyany); in the direction-constant (trade wind, strip,) or variable, changing, transitional (variable, rickety) and vortex, circular (vortex,).

Dictionary of the winds. - Leningrad: Hydrometeoizdat. L.Z. Proh. 1983.

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The air moves continuously, it always goes down and rises, and also moves horizontally. We call wind exactly the horizontal movements of air. Wind is characterized by such values \u200b\u200bas speed, force, direction. The average wind speed near the surface of the earth is 4-9 meters per second. The maximum wind speed –22 m / s - was recorded off the coast of Antarctica, with gusts up to 100 m / s.

The wind arises because of the difference in pressure, moving from the high pressure region to the low region along the shortest path, deviating to the left in the Southern Hemisphere and to the right in the Northern Hemisphere (Coriolis force). At the equator, this deviation is absent, and in the region of the poles, on the contrary, it is maximum.

Constant winds

The main directions of winds at different latitudes are determined by the distribution of atmospheric pressure. In each hemisphere, air moves in two directions: from areas of the tropical climate in which high pressure reigns, to temperate latitudes and to the equator. At the same time, it deviates in the Northern Hemisphere to the right and left in the Southern, in the direction of flow.

In the region between the equator and the tropics, trade winds blow - east winds that are constantly directed to the equator.

In regions of temperate latitudes, on the contrary, westerly winds, which are called the western transport, predominate.

These winds determine the main constant movement of air masses, which interacts with anticyclones and cyclones, and on which regional winds are then superimposed.

Regional winds

Monsoons appear on the border of land and ocean water due to the displacement of high and low pressure zones, as a result of which intermediate belts appear that change the direction of the winds according to the seasons. There are no huge land masses in the Southern Hemisphere; therefore, monsoons dominate the Northern. In summer, they blow towards the mainland, and in winter - towards the ocean. Most often, this wind is found on the Pacific coast of Eurasia (northeastern China, Korea, the Far East), in North America (Florida). It is these winds that also blow in Vietnam, which is why there is such a steady regime of winds.

Tropical monsoons are a cross between trade winds and monsoons. They arose as trade winds due to differences in pressure in different climatic zones, but, like monsoons, they change their direction depending on the season. This wind can be found on the shores of the Indian Ocean and the Gulf of Guinea.

Sirocco, a wind originating in the Mediterranean, also belongs to regional winds. It is a western transport, which, passing through the tops of the mountains, heats up and becomes dry, since it gave all its moisture to the windward slopes. Cirocco brings to the regions of southern Europe a lot of dust from the deserts of North Africa, as well as the Arabian Peninsula.

Local winds

These are coastal winds arising from the difference in the speed of heating and cooling of the sea and land, and operating in the region of the first tens of kilometers of the coast.

A breeze is a wind that arises on the border of the coast and the water area and changes its direction twice a day: during the day it blows from the water area to land, at night - the opposite. Breezes blow along the banks of large lakes and rivers. A change in direction of this wind occurs due to changes in temperature and, accordingly, in pressure. On land, it is much warmer by day, the pressure is lower than above water, while at night it is vice versa.

Bora (Mistral, Bizet, Nord-Ost) is a cold wind of a hurricane force. It is formed on narrow sections of the shores of warm seas in the cold season. Bora is directed from the leeward slopes of the mountains towards the sea. These winds blow, for example, in the mountainous regions of Switzerland and France.

Pampero is a cold storm, south or southwest wind of Argentina and Uruguay, sometimes with rain. Its formation is associated with the invasion of masses of cold air from the Antarctic.

Thermal wind is the common name for winds associated with the temperature difference that occurs between the hot desert and the relatively cold sea, Red, for example. This is the difference between the conditions of Dahab and Hurghada in Egypt, which is nearby, but the wind is not blowing there with such force. The fact is that the city of Dahab is located at the exit of the canyon formed by the Sinai and Arabian Peninsulas. The wind accelerates in the canyon itself, the effect of a wind tunnel arises, but, going out into the open space, the wind force gradually decreases. With the distance from the coast, the speed of such winds dies away. As we move toward the open ocean, global atmospheric winds have a greater impact.

Tramontana is the hurricane north wind of the Mediterranean, generated by the collision of atmospheric currents of the Atlantic with the air of the Gulf of Lyons. After their meeting, a violent flurry forms, which can exceed a speed of 55 m / s and be accompanied by a loud whistle and howl.

Another group of local winds depends on the local topography.

A hairdryer is a warm, dry wind directed from the leeward slopes of the mountains to the plain. The air gives off moisture, rising along the windward slopes, and it is here that precipitation falls. When the air descends from the mountains, it is already very dry. A type of hair dryer - the Garmsil wind - blows mainly in the summer from the south or southeast in the foothills of the Western Tien Shan.

Mountain-valley winds change their direction twice: during the day they are directed up the valley, at night, on the contrary, they blow down. This happens because the lower part of the valley warms up more intensively during the day.

There are also winds that occur in large areas of deserts and steppes.

Samum is a hot dry wind of tropical deserts, which has a stormy, barrage character. Gusts accompany dusty and sandstorms. You can meet him in the deserts of the Arabian Peninsula and North Africa.

A dry wind is a warm, dry wind in the steppe regions that forms in the warm season under conditions of an anticyclone and contributes to the appearance of droughts. These winds are found in the Caspian region and Kazakhstan.

Hamsin is a dry, hot and dusty wind, usually southerly, blowing in northeastern Africa and the eastern Mediterranean. Hasmin blows in the spring for about 50 days, carries a lot of dust and sand. It reaches its greatest strength in the afternoon, going down to nothing at sunset. Often found in Egypt.

Thus, each point on the Earth has its own different features that affect wind conditions, for example, we give some of them.

Anapa is one of the few places in Russia where the climate is subtropical Mediterranean and very pleasant for practicing water sailing. In winter it is humid, but not cold, and in the summer season the cool sea is softened by the cool sea breeze. The most favorable period for skiing is the season from July to November. Wind power in summer reaches an average of 11-15 knots. After mid-October and November, the wind intensifies and can reach 24 knots.

The Canary Archipelago has a tropical trade wind climate, moderately dry and hot. From the coast of Africa on the islands of Fuerteventura and Lanzarote comes the “Harmattan,” which brings the heat and sand of the Caxapa desert. The main wind prevailing on these islands is the trade wind, which blows for six months and almost constantly in the summer. The wind strength is 10-20 knots, in October and November it increases to 25−35.

Philippines - islands with a tropical monsoon climate. Temperatures on the coast are about 24-28 degrees. The rainy season here begins from November and lasts until April, then the north-eastern monsoon blows, and from May to October the south-western monsoons blow. Tsunamis and typhoons often occur in the northern regions of the country. The average wind force is 10-15 knots.

So, in a particular territory, the effect of various types of winds is simultaneously manifested: global, depending on areas of high or low pressure, and local, blowing only in this territory, due to its physical and geographical features. This means that for a certain place the wind system can be predictable to some extent. Scientists have created special maps for a long time, with the help of which it became possible to find out and trace the wind regimes of different areas.

Internet users often recognize the peculiarities of winds in a particular territory with the help of resources and, where it is fairly accurate, you can check whether there is wind in a particular point in the world or not.

Education local winds due to the nature of the underlying surface (orography, surface type - water or land) and temperature. Local winds of thermal origin include breezes. They are better expressed in cloudless anticyclone weather and are especially common on the western coasts of the tropics, where heated continents are washed by the waters of cold currents. We grouped other local winds depending on their properties and origin (temperature or type of landscape over which they are formed) into three groups: cold, mountain-valley and desert. Separately, the local names of the Baikal winds were cited.

Local winds

Wind description

Cold local winds:

Blizzard

cold piercing wind of storm force in Canada and Alaska (analogue of the blizzard in Siberia).

Bora (Greek: “Boreas” - north wind)

strong, gusty wind blowing mainly in the winter months from mountain ranges on the coast of the seas. It occurs when a cold wind (high pressure) passes over the ridge and displaces warm and less dense air (low pressure) on the other side. In winter, it causes severe cooling. It happens in the northwest of the Adriatic coast. Black Sea (near Novorossiysk), on Lake Baikal. The wind speed at boron can reach 60 m / s, its duration is several days, sometimes up to a week.

dry, cold, north or northeast winds in the mountains of France and Switzerland

Borasco, burraska (Spanish "borasco" - small bora)

strong flurry with thunderstorm over the Mediterranean Sea.

a small intense vortex in the Antarctic.

cold north wind in spain.

cold wind from Siberia, bringing sharp cooling, frosts and snowstorms, in Kazakhstan and the deserts of Central Asia.

sea \u200b\u200bbreeze softening the heat on the northern coast of Africa.

cold northeastern wind blowing over the lower part of the Danube lowland.

Levantine

strong east, wet wind, accompanied by cloudy weather and rains in the cold half-year above the Black and Mediterranean Seas.

cold north wind over the coast of China.

Mistral

the invasion of cold, strong and dry winds from the polar regions of Europe along the Rhone river valley on the coast of the Gulf of Lyons in France from Montpellier to Toulon in the winter-spring period (February, March).

Meltemi

north summer wind in the Aegean.

cold north wind in Japan blowing from the polar regions of Asia.

wind like bora only in the region of Baku (Azerbaijan).

Nortser, norter (eng. "Norther" - north)

strong cold and dry winter (November - April) northerly wind blowing from Canada to the USA, Mexico, the Gulf of Mexico, up to the northern part of South America. It is accompanied by a quick cooling, often with showers, snowfalls, ice.

cold south gale in argentina. Accompanied by rain and thunder. Then, the cooling rate reaches 30 ° C per day, atmospheric pressure increases sharply, cloud cover dissipates.

strong winter wind in Siberia, raising snow from the surface, resulting in reduced visibility to 2-5 m.

Mountain-valley winds:

hair dryers (Bornan, brev, Talvind, Helm, Chinook, Garmsil) - warm, dry, gusty winds that cross the ridges and blow from the mountains along the slope into the valley last less than a day. In different mountainous regions, foehn winds have their own local names.

a breeze in the Swiss Alps blowing from the valley of the river. Drans to the middle of Lake Geneva.

daytime valley wind combined with a breeze on Lake Como (Northern Italy).

Garmsil

strong dry and very hot (up to 43 ° С and above) wind on the northern slopes of Kopetdag and the lower parts of the Western Tien Shan.

pleasant valley wind in Germany.

Chinook (or Chinook)

dry and warm southwest wind on the eastern slopes of the Rocky Mountains of North America, which can cause very strong temperature fluctuations, especially in winter. There is a known case when in January in less than a day the air temperature increased by 50 °: from -31 ° to + 19 °. Therefore, the Chinook is called a "snow-eater" or "snowmobile."

Desert Winds:

samum, sirocco, hamsin, habub - dry, very hot dusty or sandy winds.

dry hot west or southwest wind in the deserts of Sev. Africa and Arabia, flies in a whirlwind, closes the sun and sky, rages for 15-20 minutes.

dry, hot, strong wind of the southern rumbas blowing to the Mediterranean countries (France, Italy, the Balkans) from the deserts of North Africa and Arabia; lasts several hours, sometimes days.

the sweltering hot and dusty wind blowing over Gibraltar and southeastern Spain

it is a wind with high temperature and low humidity in the steppes, semi-deserts and deserts, is formed along the edges of anticyclones and lasts several days, increasing evaporation, drying out the soil and plants. Prevails in the steppe regions of Russia, Ukraine, Kazakhstan and the Caspian region.

a dust or sand storm in northeast Africa and the Arabian Peninsula.

Hamsin (or “fifty days”)

a hot gale in Egypt blowing from Arabia for up to 50 days in a row.

Harmattan

the local name of the northeast trade wind blowing from the Sahara to the Gulf of Guinea; Brings dust, high temperatures and low humidity.

hamsin analog in Central Africa.

Eblis ("the dusty devil")

the sudden rise of heated air on a calm day in the form of a vortex that carries sand and other objects (plants, small animals) to a very high height.

Other local winds:

dusty south or southwest wind blowing from Afghanistan along the valleys of Amu Darya, Syr Darya, Vakhsh. It depresses vegetation, falls asleep with sand and dust, demolishes the fertile layer of soil. In early spring it is accompanied by downpours and cold snap to frost, ruins the sprouts of cotton. In winter, it is sometimes accompanied by wet snow and leads to frostbite and death of livestock caught on the plains.

strong wind from the Caspian, bringing flood surges to the lower Volga.

southeast trade wind in the Pacific Ocean (for example, off the islands of Tonga).

Cordonaso

strong south winds along the west coast of mexico.

the sea breeze blowing from the Pacific Ocean on the coast of Chile is especially strong in the afternoon in the city of Valparaiso because of which they even suspend port work. Its antipode - the coastal breeze - is called terrap.

Probe (Sondo)

strong north or west dry and hot winds like foehn on the eastern slopes of the Andes (Argentina). It affects people depressingly.

prevails in the eastern part of the Mediterranean Sea, warm, brings rains and storms (lighter in the western part of the Mediterranean Sea)

tailwind on rivers and lakes.

Tornado (Spanish: Tornado)

a very strong atmospheric whirlwind over land in North America, is highly repeatable, is formed as a result of the collision of cold masses from the Arctic and warm masses from the Caribbean.

Winds of Baikal:

Verkhovik, or hangar

north wind, overpowering other winds.

Barguzin

northeast gale wind blowing in the central part of the lake from the Barguzin valley across and along Baikal

local southwestern gale, bearing cloudy weather.

Harahaiha

autumn-winter northwest wind.

southeast storm wind blowing from the valley of the river. Goloustnoy.

cold strong chilling winter wind blowing along the river valley. Sarma.

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Sourse of information:  Romashova T.V. Geography in figures and facts: Textbook / - Tomsk: 2008.

Atmospheric pressure and its measurements

The air surrounding the Earth has mass, and therefore presses on the earth's surface. 1 liter of air at sea level weighs about 1.3 g. Therefore, the atmosphere presses with a force of 1.33 kg for every square centimeter of the earth's surface. This average air pressure at sea level corresponding to the mass of a mercury column with a height of 760 mm and a cross-section of 1 cm2 is taken as normal. Air pressure is also measured in millibars: 1 mm of pressure is 1.33 mbar. So, to convert millimeters to millibars, you need to multiply a millimeter of pressure by 1.33.

The pressure varies with air temperature and altitude. Since air expands when heated, and contracts when it is cooled, warm air is lighter (causes less pressure) than cold air. As the air rises upward, the pressure decreases mainly because its column height is less per unit area. Therefore, in the high mountains, the pressure is much less than at sea level. The vertical segment through which atmospheric pressure decreases by one is called the baric degree. In the lower atmosphere at the surface, pressure decreases by about 10 mm for every 100 m of uplift.

To measure pressure, a mercury column meter is used, and in the field, a metal aneroid barometer. The latter is a metal box from which air is pumped out. With an increase in atmospheric pressure, the bottom of the box contracts, and with a decrease, it unbends. These changes are passed to the arrow, moves on a dial.

Winds and their origin

In the distribution of pressure on the earth's surface is also zoning. The general planetary scheme of pressure distribution is as follows: a belt of low pressure extends along the equator; to the north and south of it at C-40 latitudes - high pressure belts, then at 60-70 ° C. and y. w. - Belts of low pressure, in the circumpolar regions - areas of high pressure. The real picture of the distribution

pressure is much more complicated, which is reflected on the maps of July and January isobars).

The uneven distribution of pressure on the globe causes the movement of air from the region of high pressure to low. This movement of air in the horizontal direction is called the wind. The greater the pressure difference, the stronger the wind blows. Wind power is estimated from 0 to 12baliv.

The direction of the wind is determined by the side of the horizon from where it blows. The wind changes with pressure. A significant effect on its direction is also the rotation of the Earth around its axis.

General atmospheric circulation. Trade winds and other constant winds

Winds observed above the earth's surface are divided into three groups: local winds caused by local conditions (temperature, terrain features) winds of cyclones and anticyclones; winds, is part of the general circulation of the atmosphere. The general atmospheric circulation is formed by the largest air flows of a planetary scale, capturing the entire troposphere and lower stratosphere (up to about 20 km) and are characterized by relative stability. In the troposphere, these include the trade winds, western winds of temperate latitudes and eastern winds of the circumpolar regions, monsoons. The reason for these planetary air movements is the pressure difference.

A belt of reduced pressure is formed above the equator due to the fact that here the air is warm throughout the year and it mainly rises (the upward movement of air dominates). In the upper layers of the troposphere, it cools and spreads towards high latitudes. Coriolis force, deflecting the air currents going in the upper troposphere from the equator, provides them at 30 latitudes of the western direction, forcing them to move only along parallels. Therefore, this cooled air undergoes downward movement here, causing high pressure (although the surface temperature is even higher than at the equator). These subtropical high-pressure belts serve as the main “vitrorazdilam on Earth. From them, the air volumes of the lower troposphere are directed both to the equator and towards temperate latitudes.

Winds, characterized by the stability of direction and speed, blow all year round from high pressure belts (25-35 ° N and S). They are called trade winds to the equator. Due to the rotation of the Earth around its axis, they deviate from the previous direction, in the Northern Hemisphere they blow from the northeast to the southwest, and in the South from the southeast to the northwest.

Winds blowing from subtropical high-pressure belts towards the poles, deviating to the right or left depending on the hemisphere, change their direction to the west. Therefore, in moderate latitudes, westerly winds prevail, although they are not as steel as the trade winds.

Constant winds also blow from high-pressure regions of the polar latitudes toward temperate latitudes with relatively low pressure. Experiencing the effects of the rotation force, they are northeastern in the Northern Hemisphere, and southeastern in the Southern Hemisphere.

In temperate latitudes, where there is a meeting of warm air masses from the tropics and cold - from the polar regions, frontal cyclones and anticyclones constantly arise, in which air is transported from west to east.

Wind is one of the most unique natural phenomena. We cannot see it, touch it, but we are able to observe the results of its manifestation, for example, how it slowly or quickly drives clouds and clouds through the sky, tilts trees to the ground with its power or slightly rubs foliage.

Concept of wind

What is the wind? The definition from the point of view of meteorology is as follows: this is the horizontal movement of layers of air from a zone with high atmospheric pressure to a zone of low, accompanied by a certain speed. This movement occurs because during the day the sun penetrates the air layer of the Earth. Some rays, reaching the surface, heat the oceans, seas, rivers, mountains, soil, rocks and stones that give off heat to the air, thereby heating it. For the same amount of time, dark objects absorb more heat and get warmer.

But what does it matter how heat is given off and how fast? And how does this help us figure out what the wind is? The definition is as follows: the land heats faster than water, which means that the air accumulated above it receives heat from it and rises, therefore, the atmospheric pressure above this section drops. With water, everything is exactly the opposite: above it, the air masses are colder and the pressure is higher. As a result, cold air is displaced from the high-pressure section to the low-pressure section, forming a wind. The larger the difference between these pressures, the stronger it is.

Types of winds

Having figured out what the wind is, you need to find out how many species there are and how they differ from each other. There are three main groups of winds:

  • local
  • permanent
  • regional.

Local winds correspond to their name and blow only in certain areas of our planet. Their appearance is associated with the specifics of local reliefs and temperature changes in relatively short periods of time. These winds are characterized by short length and daily frequency.

What is a wind of local origin, is now clear, but it is divided into its subspecies:

  • A breeze is a light breeze that changes direction twice a day. In the daytime it blows from the sea to land, and at night the opposite.
  • Bora is a high-speed cold air stream blowing from the tops of mountains to valleys or coasts. He is fickle.
  • Foehn is a warm and light spring wind.
  • Dry wind - a dry wind prevailing in the steppe regions during the warm period under conditions of an anticyclone. He portends a drought.
  • Cirocco - the rapid southern, southwest air currents that form in the Sahara.
  • And what is the hamsin wind? These are dusty, dry and hot air masses prevailing in northeast Africa and the east of the Mediterranean.

Permanent winds include those that depend on the total air circulation. They are stable, uniform, permanent and strong. They include:

  • trade winds - winds from the east, differ in constancy, not changing direction and strength of 3-4 points;
  • anti-trade winds - winds from the west, carrying huge air masses.

Regional wind appears as a result of pressure drops, a bit like a local one, but more stable and powerful. The monsoon, which originates in the tropics, at the turn of the ocean, is considered a vivid representative of this species. It blows periodically, but in large-scale flows, changing its direction a couple of times a year: in the summer season - from water to land, in the winter - vice versa. Monsoon brings a lot of moisture in the form of rains.

A strong wind is ...

What is a strong wind and how does it differ from other streams? Its main feature is its high speed, which ranges from 14-32 m / s. It produces devastating actions or brings damage, destruction. In addition to speed, temperature, direction, location and duration also matter.

Types of Strong Winds

  • A typhoon (hurricane) is accompanied by saturated precipitation and a drop in temperature, great strength, speed (177 km / h or more), blowing at a distance of 20-200 m for several days.
  • What is a wind called a flurry? This is a sharp, sudden stream at a speed of 72-108 km / h, formed in the hot period as a result of the powerful penetration of cold air into the warm zone. It blows for a couple of seconds or tens of minutes, changing direction, and brings a decrease in temperature.
  • Storm: its speed is 103-120 km / h. It is characterized by high duration, strength. It is a source of strong sea oscillations and destruction on earth.

  • A tornado (tornado) is an air vortex visually similar to a dark pillar along which a curved axis passes. At the bottom and top of the column there are extensions similar to a funnel. The air in a whirlwind rotates counterclockwise at a speed of 300 km / h and draws all nearby objects and objects into its funnel. The pressure inside the tornado is reduced. The pillar reaches a height of 1,500 m, and its diameter is from a dozen (above water) to hundreds of meters (above the ground). A tornado can go from a couple of hundred meters to tens of kilometers at a speed of 60 km / h.
  • Storm - air mass, the speed of which is in the range of 62-100 km / h. Storms abundantly cover the area with sand, dust, snow, earth, causing harm to people and the economy.

Description of wind power

Answering the question of what is wind power, it will be appropriate to note that here the concept of force is interconnected with speed: the higher it is, the stronger the wind. This indicator is measured on a 13-point Beaufort scale. Zero value characterizes calm, 3 points - light, weak wind, 7 - powerful, 9 - the appearance of a storm, over nine - merciless storms, hurricanes. Strong winds often blow over the sea, the ocean, because nothing prevents them here, unlike the rocky mountains, hills, forests.

Solar wind definition

What is a solar wind? This is an amazing phenomenon. Ionized plasma particles flow from the solar corona (outer layer) into space with a speed range of 300-1200 km / s, which depends on the activity of the Sun.

There are slow (400 km / s), fast (700 km / s), high-speed (up to 1200 km / s) solar winds. They form a region with space around the central celestial body that protects the solar system from interstellar gas entering it. In addition, thanks to them, such phenomena as the radiation belt and aurora occur on our planet. This is what the solar wind is.

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