What is Baikal made of? Dark rings on the lake. Video: The underwater world of Lake Baikal

Security measures

During the 20th century, some efforts were made to preserve Baikal: the fight against poaching, illegal logging, laws were adopted to protect the Baikal Territory. Reserves appeared in the Baikal region and National parks. In 1916, the first Barguzinsky Reserve was created. To the best of their ability, scientific research was carried out to protect the Baikal nature.

Tipping point in conservation unique lake occurred when it received UNESCO World Heritage Site status on December 5, 1996. Obligations were imposed on Russia to preserve the unique ecosystem. IN present time ongoing big job for the protection of Baikal nature:

• About 97 organizations deal with the problems of Baikal, 400 dissertations have been written on the topic of protecting the lake;
• 3 institutes are responsible for monitoring the state of Lake Baikal;
• to the essential work of protecting a unique corner nature, numerous environmental societies and environmental organizations have joined;
• was established in 2012 federal program"Protection of Lake Baikal and socio-economic development of the Baikal natural area for 2012-2020".

The unique ecosystem of Baikal, the richest sources of resources of the Baikal flora and fauna, the beauty of its vast expanses is vital to preserve and protect.

Very informative article. I didn’t even suspect that there could be something unique in Russia. I was struck by the fact that the temperature on the lake differs from the surrounding areas by as much as ten degrees! It turns out that in the summer you can go there to cool down, and in the winter to warm up. Now I will definitely visit this lake, because it amazes everyone. I want to see the transparency of the waters with my own eyes.

Baikal- lake tectonic origin located in the southern part of Eastern Siberia, on the border of the Republic of Buryatia and the Irkutsk region

Baikal itself

Lake Baikal stretches from southwest to north for 636 kilometers. The width of the lake varies from 25 to 80 km. The water surface area is 31,722 km. sq. Length coastline is 2100 km. Baikal is the deepest lake in the world - its maximum depth is 1642 meters. The lake has huge reserves of fresh water - 23,615 km. cubic meters, which is 20% of all world reserves.

The area around

Lake Baikal is surrounded on all sides by hills and mountain ranges. Wherein West Coast- steep and rocky, the eastern coast is more gentle. 336 streams and rivers flow into the Lake. Most major tributaries: Upper Angara, Selenga, Turk, Barguzin, Sarma, Snezhnaya. Only one river flows out of the lake - the Angara. There are 27 islands on Baikal, the largest of the islands is Olkhon, which is 71 km long and 12 wide, largest peninsula- Holy Nose

Climate

The huge water mass of Lake Baikal has a strong influence on the climate of the coastal area. Summers are cooler here, while winters are milder. Spring comes later by 10-15 days compared to the surrounding areas, and sometimes longer. The peculiarities of the climate are determined by the Baikal winds, which even have their own names - Sarma, Barguzin, Kultuk, Verkhovik.

When to go to Baikal

Characteristics

Briefly the main characteristics of Baikal

• Length - 363 km.
• Width - 79.5 km.
• Area -31722 sq. km.
• Volume - 23615 cubic meters. km.
• The average depth is 744 meters.
• Max Depth- 1637 meters.
• There are 27 islands on Baikal.
• 29 fish species are endemic

Depth

Lake Baikal is the deepest in the world - 1637 meters, the depth was established in 1983. Wherein average depth also very large - 744 meters. In 2002, these data were confirmed and a depth map was compiled.

• the area of ​​Baikal is equal to the area three countries— Denmark, Belgium, the Netherlands.
• Baikal is the deepest lake on earth
• The lake contains 19% of the world's fresh water

Baikal is one of the wonders of Russia. The depth of Lake Baikal is a record. The African Lake Tanganyika, which follows it, has a depth that is 200 meters less. The reservoir is popular with tourists and explorers. Until now, the secrets of Baikal have not been fully disclosed and excite scientists.

Where is

Located almost in the center of Eurasia, in Western Siberia, on the border of the Irkutsk region and the Buryat Republic, Baikal has the shape of a huge crescent. In terms of area, it is equivalent to the Netherlands, Belgium or Denmark. Surrounded by mountains and hills, the reservoir occupies a huge pit. The question of how deep Lake Baikal is is very interesting. We will tell about this later, and now we will describe the relief of the coast. In the eastern part it is relatively flat, the mountains are tens of kilometers away. West Bank lakes are mountainous.

The Baikal area is seismically active. Earthquakes of small magnitude occur regularly, and there are strong ones, the echoes of which are felt even in Irkutsk. So, in the second half of the 19th century, an earthquake with a force of 10 points occurred. As a result, a land plot of 200 square meters was flooded. km, where 1300 people lived. Strong tremors were noted in 1959 (9 points), in 2008 (9 points) and 2010 (6 points).

The history of the lake and the name

For a long time it was believed that the age of Baikal is 25-30 million years. But recent studies of the relief of the bottom of the lake with its mud volcanoes have shown that it is up to 150 thousand years old. In this regard, Baikal is also unique, because the average age of lakes of a similar origin is 10-15 thousand years.

The rift basin in which Baikal is located is similar in structure to the Dead Sea. Its depth is the depth of Baikal. The opinions of scientists on the formation of the basin differ.

There are 3 versions:

1. The depression is the result of a transform fault.
2. The depression arose as a result of the action of a hot mantle flow under the lake.
3. The depression was formed as a result of minor collisions of Hindustan and the Eurasian plate.

Obviously, as a result of seismic activity, the relief of the bottom of Lake Baikal is changing and is still subsiding.

The origin of the name of the lake is unclear, but all four points of view reflect the greatness of the reservoir and indirectly indicate how deep Baikal is: Japanese - "great water", Turkic - "rich lake", Mongolian - "rich fire" and Chinese - "northern sea" . In our country modern name began to be used in the 17th century, it was borrowed from the Buryats (Beigkhel): in Russian the word was assimilated and the usual pronunciation was established - Baikal.

Features of the landscape and climate

The record depth of Baikal and the vast area of ​​the watershed determine local climate. Mild winters, but rather cool summers, long autumns and long springs - these are the climatic characteristics of the areas adjacent to the lake. Also, the weather of Lake Baikal is influenced by local specific winds, such as barguzin or kultuk. Because of the current winds, Baikal is referred to as the most restless lakes in the world.

Another remarkable property of the climate is mirages, which appear up to 7 times a year and last for 5-6 hours. They arise due to the difference in air temperature between the surface of the water and the space above it. Mirages occur due to the refraction of rays. Landscape objects can visually rise above the water surface so that the horizon is visible. Another kind of mirage is when thousands of kilometers distant natural objects approach optically.

Baikal waters: features and currents

The water of the lake has fascinated local residents: she was idolized, she was treated. It is saturated with oxygen, close in composition to distilled water, and due to the action of microorganisms, it is practically devoid of minerals. The volume of Baikal water is 90% of Russia's fresh water reserves and 20% of the world's. For comparison: there is more water in our great lake than in the 5 largest American lakes combined.

The transparency of Baikal water is surprising: visibility reaches 40 meters. True, this figure can drop to 10 meters during the flowering period of plants. Depending on the time of year and the activity of plants and microorganisms, Baikal water changes its color from bright blue in cold weather to green in summer and autumn.

Baikal is saturated with 336 rivers and streams constantly flowing into it. Turka, Snezhnaya, Upper Angara, Sarma are the largest of them. The Angara is the only river flowing from Lake Baikal.

Depth indicators

How deep is Lake Baikal? It is determined by the origin and parameters of the depression in which the lake is located. The last depth studies were carried out in 1983, they were confirmed in 2002. The lake is fascinating: with an average of 730 meters, the maximum depth of Baikal is 1630 meters. There are two more lakes on Earth with a depth of more than 1000 meters: Tanganyika and the Caspian Sea. And in last water salty, not fresh. Even the average depth of Baikal is amazing - few lakes on Earth can boast a value of 730 meters.

Currents act on the surface of Lake Baikal, encircling its shores and the largest islands. In certain places (the western coast of the Small Sea), the current is quite strong, so even in calm weather, ships drift. The decrease in the intensity of water movement is affected by the depth of Lake Baikal in this place and distance from the coastline.

Flora and fauna

Baikal is unique in its flora and fauna: two thirds of animal representatives live exclusively here. Oxygenated water provides a favorable environment for the reproduction of species. Scientists have discovered only 70% of the fauna of Baikal. Epishura crustaceans form the basis of the lake's food chain, in addition, they perform an important function of water purification - they pass it through themselves. The fauna of Baikal has 56 species of fish. Among them is a unique species - golomyanka. The fish is interesting in that it does not lay eggs, but gives birth to fry alive. The golomyanka is 43% fat; in search of food, it migrates from great depths to shallow ones.

Nerpa is the only mammal that lives on Lake Baikal.

From flora sponges can be noted, which grow at great depths and are the oldest inhabitants of Baikal.

The uniqueness of the lake is recognized all over the world. Not only the depth of Baikal is taken into account, but also its unique ecosystem. The climate, geographical features of the lake attract tourists and scientists from all over the world.

Baikal - freshwater lake in the south of Eastern Siberia, it stretched from 53 to 56 ° N. and from 104 to 109°30’ E Its length is 636 km, and the coastline is 2100 km. The width of the lake varies from 25 to 79 km. The total area of ​​the lake (mirror area) is 31,500 sq. km.

Baikal is the deepest lake in the world (1620 m). It contains the largest fresh water reserves on earth - 23 thousand cubic kilometers, which is 1/10 of the world's fresh water reserves. A complete change of such a huge amount of water in Baikal takes 332 years.

This is one of the oldest lakes, its age is 15-20 million years.

336 rivers flow into the lake, including the Selenga, Barguzin, Upper Angara, and only one Angara flows out. Baikal has 27 islands, the largest of which is Olkhon. The lake freezes in January, opens in May.

Baikal lies in a deep tectonic depression and is surrounded by taiga-covered mountain ranges; the area around the lake has a complex, deeply dissected relief. Near Baikal, the band of mountains expands noticeably. mountain ranges stretch here parallel to one another in the direction from the northwest to the southeast and are separated by basin-like depressions, along the bottom of which rivers flow and lakes are located in some places. The height of most of the ridges of Transbaikalia rarely exceeds 1300 - 1800, but most high ridges reach high values. For example, xr. Khamar-Daban (Sokhor peak) - 2304 m, and the Barguzinsky ridge. about 3000 m.

Tectonic movements continue here even now. This is evidenced by frequent earthquakes in the region of the basin, outcrops of hot springs, and, finally, subsidence of significant sections of the coast.

The waters of Baikal have a blue-green color, are distinguished by exceptional purity and transparency, often even greater than in the ocean: you can clearly see stones lying at a depth of 10-15 m and thickets of greenish algae, and a white disk lowered into the water is visible at a depth of 40 m.
Baikal lies in the temperate zone.

Geography of Lake Baikal.

Lake Baikal is located in the south of Eastern Siberia. In the form of a crescent being born, Baikal stretched from southwest to northeast between 55°47′ and 51°28′ north latitude and 103°43′ and 109°58′ east longitude. The length of the lake is 636 km, the maximum width in the central part is 81 km, the minimum width opposite the Selenga delta is 27 km. Baikal is located at an altitude of 455 m above sea level. The length of the coastline is about 2000 km. The area of ​​the water mirror, determined at the water's edge of 454 m above sea level, is 31,470 square kilometers. The maximum depth of the lake is 1637 m, the average depth is 730 m. 336 permanent rivers and streams flow into Baikal, while half of the water entering the lake comes from the Selenga. flows out of Baikal the only river— Angara. However, the question of the number of rivers flowing into Baikal is rather controversial, most likely there are fewer than 336. There is no doubt that Baikal is the deepest lake in the world, the closest contender for this title, African lake Tanganyika, lags behind by as much as 200 meters. There are 22 islands on Baikal, although, as mentioned above, there is no unanimity on this issue. Most large island— Olkhon.

Age of Lake Baikal.

The age of the lake is usually given in the literature as 20-25 million years. In fact, the question of the age of Baikal should be considered open, since the use of various methods for determining the age gives values ​​from 20-30 million to several tens of thousands of years. Apparently, the first estimate is closer to the truth - Baikal is really very ancient lake.
It is believed that Baikal arose as a result of the action of tectonic forces. Tectonic processes are still going on, which is manifested in the increased seismicity of the Baikal region. If we assume that the age of Baikal is indeed several tens of millions of years, then this is the oldest lake on Earth.

Origin of name.

Numerous scientific studies have been devoted to the problem of the origin of the word "Baikal", which indicates a lack of clarity in this matter. There are about a dozen possible explanations for the origin of the name. Among them, the most probable is the version of the origin of the name of the lake from the Turkic-speaking Bai-Kul - a rich lake. Of the other versions, two more can be noted: from the Mongolian Baigal - a rich fire and Baigal Dalai - big lake. The peoples who lived on the shores of the lake called Baikal in their own way. Evenks, for example, - Lamu, Buryats - Baigal-Nuur, even the Chinese had a name for Baikal - Beihai - the North Sea.

The Evenki name Lamu - the Sea was used for several years by the first Russian explorers in the 17th century, then they switched to the Buryat Baigal, slightly softening the letter "g" by phonetic replacement. Quite often, Baikal is called the sea, simply out of respect, for its violent temper, for the fact that the far opposite shore is often hidden somewhere in the haze ... At the same time, the Small Sea and the Big Sea are distinguished. Small Sea - what is located between north coast Olkhon and the mainland, everything else is the Big Sea.

Baikal water.

Baikal water is unique and amazing, like Baikal itself. It is unusually transparent, pure and saturated with oxygen. In not so ancient times, it was considered healing, with its help, diseases were treated. In spring, the transparency of Baikal water, measured using the Secchi disk (a white disk with a diameter of 30 cm), is 40 m (for comparison, in the Sargasso Sea, which is considered the standard of transparency, this value is 65 m). Later, when a massive algae bloom begins, the transparency of the water decreases, but in calm weather, the bottom can be seen from a boat at a fairly decent depth. This high transparency is due to the fact that Baikal water, due to the activity of living organisms living in it, is very weakly mineralized and close to distilled. The volume of water in Baikal is about 23 thousand cubic kilometers, which is 20% of the world's fresh water reserves.

Climate.

The climate in Eastern Siberia is sharply continental, but the huge mass of water contained in Baikal and its mountainous surroundings create an unusual microclimate. Baikal works like a big thermal stabilizer - in winter it is warmer in Baikal, and in summer a little cooler than, for example, in Irkutsk, located at a distance of 60 km from the lake. The temperature difference is usually around 10 degrees. A significant contribution to this effect is made by forests growing on almost the entire coast of Lake Baikal.

Baikal's influence is not limited to regulation temperature regime. Due to the fact that evaporation cold water from the surface of the lake is very insignificant, clouds cannot form over Baikal. In addition, the air masses that bring clouds from the land heat up when passing the coastal mountains, and the clouds dissipate. As a result, the sky over Baikal is clear most of the time. This is also evidenced by the numbers: the number of hours of sunshine in the area of ​​Olkhon Island is 2277 hours (for comparison, on the Riga seashore in 1839, in Abastumani (Caucasus) - 1994). You should not think that the sun always shines over the lake - if you are not lucky, then you can run into one or even two weeks of disgusting rainy weather even in the sunny place Baikal - on Olkhon, but this is extremely rare.

Average annual temperature water on the surface of the lake +4°С. Near the coast in summer the temperature reaches +16-17°C, in shallow bays up to +22-23°C.

Wind and waves.

The wind on Baikal blows almost always. More than thirty local names of winds are known. This does not mean at all that there are so many different winds on Baikal, just that many of them have several names. Peculiarity Baikal winds in that almost all of them almost always blow along the coast and there are not as many shelters from them as we would like.

Prevailing winds: northwest, often called mountain winds, northeast (barguzin and verkhovik, also known as angara), southwest (kultuk), southeast (shelonnik). Maximum wind speed, registered on Baikal, 40 m/s. In the literature, there are also large values ​​- up to 60 m / s, but there is no reliable evidence for this.

Where there is wind, there, as you know, there are waves. I note right away that the opposite is not true - the wave can be even with complete calm. Waves on Lake Baikal can reach a height of 4 meters. Sometimes values ​​​​of 5 and even 6 meters are given, but this is most likely an estimate “by eye”, which has a very large error, as a rule, towards overestimation. The height of 4 meters was obtained using instrumental measurements in the open sea. The excitement is strongest in autumn and spring. In the summer on Lake Baikal, strong excitement is rare, and calm often occurs.

Numerous scientific studies have been devoted to the problem of the origin of the word "Baikal", which indicates a lack of clarity in this matter. There are about a dozen possible explanations for the origin of the name. Among them, the most probable is the version of the origin of the name of the lake from the Turkic-speaking Bai-Kul - a rich lake.

Of the other versions, two more can be noted: from the Mongolian Baigal - a rich fire and Baigal Dalai - a large lake. The peoples who lived on the shores of the lake called Baikal in their own way. Evenks, for example, - Lamu, Buryats - Baigal-Nuur, even the Chinese had a name for Baikal - Beihai - the North Sea.

The Evenk name Lamu - the Sea was used for several years by the first Russian explorers in the 17th century, then they switched to the Buryat Baigal, slightly softening the letter "g" by phonetic replacement. Quite often, Baikal is called the sea, simply out of respect, for its violent temper, for the fact that the far opposite shore is often hidden somewhere in the haze... At the same time, the Small Sea and the Big Sea are distinguished. The Small Sea is what is located between the northern coast of Olkhon and the mainland, everything else is the Big Sea.

Baikal water

Baikal water is unique and amazing, like Baikal itself. It is unusually transparent, pure and saturated with oxygen. In not so ancient times, it was considered healing, with its help, diseases were treated. In spring, the transparency of Baikal water, measured using the Secchi disk (a white disk with a diameter of 30 cm), is 40 m (for comparison, in the Sargasso Sea, which is considered the standard of transparency, this value is 65 m). Later, when a massive algae bloom begins, the transparency of the water decreases, but in calm weather, the bottom can be seen from a boat at a fairly decent depth. Such a high transparency is due to the fact that Baikal water, due to the activity of living organisms that live in it, is very weakly mineralized and close to distilled.

The volume of water in Baikal is about 23 thousand cubic kilometers, which is 20% of the world and 90% of Russian fresh water reserves. Every year, the Baikal ecosystem reproduces about 60 cubic kilometers of clear, oxygenated water.

Age of Lake Baikal

The age of the lake is usually given in the literature as 20-25 million years. In fact, the question of the age of Baikal should be considered open, since the use of various methods for determining the age gives values ​​from 20-30 million to several tens of thousands of years. Apparently, the first estimate is closer to the truth - Baikal is indeed a very ancient lake. If we assume that the age of Baikal is indeed several tens of millions of years, then this is the oldest lake on Earth.

It is believed that Baikal arose as a result of the action of tectonic forces. Tectonic processes are still going on, which is manifested in the increased seismicity of the Baikal region.

Climate in the area of ​​Lake Baikal.

The climate in Eastern Siberia is sharply continental, but the huge mass of water contained in Baikal and its mountainous surroundings create an unusual microclimate. Baikal works like a big thermal stabilizer - in winter it is warmer in Baikal, and in summer a little cooler than, for example, in Irkutsk, located at a distance of 70 km from the lake. The temperature difference is usually around 10 degrees. A significant contribution to this effect is made by forests growing on almost the entire coast of Lake Baikal.

The influence of Lake Baikal is not limited to the regulation of the temperature regime. Due to the fact that the evaporation of cold water from the surface of the lake is very small, clouds cannot form over Baikal. In addition, the air masses that bring clouds from the land heat up when passing the coastal mountains, and the clouds dissipate. As a result, the sky over Baikal is clear most of the time. This is also evidenced by the numbers: the number of hours of sunshine in the region of Olkhon Island is 2277 hours (for comparison - on the Riga seashore 1839, in Abastumani (Caucasus) - 1994). One should not think that the sun always shines over the lake - if you are not lucky, you can get one or even two weeks of disgusting rainy weather even in the sunniest place of Baikal - on Olkhon, but this is extremely rare.

The average annual water temperature on the surface of the lake is +4°C. Near the coast in summer the temperature reaches +16-17°C, in shallow bays up to +22-23°C.

Wind and waves on Baikal.

The wind on Baikal blows almost always. More than thirty local names of winds are known. This does not mean at all that there are so many different winds on Baikal, just that many of them have several names. The peculiarity of the Baikal winds is that almost all of them almost always blow along the coast and there are not as many shelters from them as we would like.

Prevailing winds: northwest, often called mountain winds, northeast (barguzin and verkhovik, also known as angara), southwest (kultuk), southeast (shelonnik). Max speed wind, registered on Baikal, 40 m/s. Large values ​​are also found in the literature - up to 60 m/s, but there is no reliable evidence for this.

Where there is wind, there, as you know, there are waves. I note right away that the opposite is not true - the wave can be even with complete calm. Waves on Lake Baikal can reach a height of 4 meters. Sometimes values ​​​​of 5 and even 6 meters are given, but this is most likely an estimate “by eye”, which has a large error, as a rule, in the direction of overestimation. The height of 4 meters was obtained using instrumental measurements in the open sea. The excitement is strongest in autumn and spring. In the summer on Lake Baikal, strong excitement is rare, and calm often occurs.

Ichthyofauna of Baikal.

Depending on the habitat conditions, fish can be divided into several groups. Sturgeon, pike, burbot, ide, roach, dace, perch, minnow occupy coastal shallow waters and river deltas in Baikal. Siberian fish mountain rivers: grayling, taimen, lenok inhabit small tributaries of the lake and its coastal zone. Omul, since ancient times considered a symbol of Baikal, inhabits its open and coastal part, whitefish, another well-known inhabitant of Baikal, inhabits only the coastal part.

The most remarkable group of Baikal fish are gobies, of which there are 25 species. Most Interest of them are golomyanka. This miracle of Baikal is not found anywhere else in the world. Golomyanka is unusually beautiful, shimmers in the light blue and pink, and if it is left in the sun it will melt, leaving only bones and a greasy stain. She is the main and most numerous inhabitant of Baikal, but rarely gets into the nets of fishermen. Her only enemy is the seal, for which she is the main food.

In order to preserve rare and endangered animals, the strictest and complete ban on hunting, the maximum preservation of the habitat, the creation of special nurseries, national parks, nature reserves and sanctuaries