Does the geography show that the summer monsoon is only in the vicinity of the subtropical high?

There are four distinct seasons in the middle latitudes, and no distinctions in the high and low latitudes. In the middle latitudes, there is a significant difference between land and sea heat in winter and summer, with cold high pressure forming in winter and hot low pressure forming in summer on the continent, and vice versa at sea, so a monsoon climate is formed in the eastern part of the continent. Among them, China's summer monsoon is formed in the north and west of the western Pacific subtropical high, blowing to the Asian low pressure, with the north-south movement of the direct sun point of the subtropical high followed the north-south movement, the summer monsoon also followed the northward extension or south-east retreat, in this process the frontal rain belt is naturally affected and moved, thus affecting the rainy season in various parts of China to start early and evening and the length of the rainy season.

a.If the location of the subtropical high is northerly, the rainy season in the south is long, which is easy to form floods, and if the location of the subtropical high is northerly, the rainy season in the north is prolonged, and floods are easy to occur. The South is the opposite.

b.If the summer monsoon is weak, the rainy season in the north is long, which is easy to form floods, and the summer monsoon is weak, and the rain belt stays in the south for a long time, and the rainy season is long and waterlogged. The North is the opposite.

c.If the summer monsoon is strong, the rainy season in the south is short, and it is easy to form a drought pair, and if the summer monsoon is strong, the frontal rain belt stays in the north for a long time, and the south forms a drought.

d.If the location of the subtropical high is eastward, the rainy season in the east is short, which is prone to drought error, and if the location of the subtropical high is eastward, the rainy season in the east is prolonged, the rainy season in the west is shortened, and the rainy season in the west is shortened, and the west is dry and the east is flooded.

The monsoon is a climatic feature that only a few regions have, of course, the monsoon climate is most significant in East and Southeast Asia, and these regions are controlled by the subtropical high in summer, so the influence range of the summer monsoon is only near the subtropical high.

There must be a difference between land and sea heat at high latitude;

c must be right;

I can't be very sure about the reasons for A and D, for example, in the Mediterranean region, the summer is controlled by the subtropical high, which is hot and dry, so the analysis of both options is correct. However, generally speaking, the early and evening precipitation and the intensity of precipitation in various parts of China mainly depend on the advance and retreat of the summer monsoon;

Fault cause of b: When the summer monsoon is stronger, the rainy season starts earlier in the north and the precipitation is higher than in previous years, and the opposite is true in the south; When the summer monsoon is weak, the rainy season starts later in the north and the precipitation is lower than usual, while in the south the opposite is true.

This topic is to examine the position of the subtropical high and the influence of the rain belt on the weather in China.

To understand this problem, we must first know two things.

1. The subtropical high that affects the weather in China is the subtropical high from the western Pacific Ocean.

2. The rain band is located 5 8 degrees north of the subtropical high ridge (understood as the subtropical high).

2 In April, the subtropical high ridge stabilized at 18° 20° north latitude, and the rain band was about 5° 8° north of the subtropical high ridge in the Pearl River Basin, at which time the Pearl River Basin entered the flood season. There was low temperature and rainy weather in southern China.

In June, the subtropical high ridge advanced to South China, and South China had high temperatures and little rainfall. The rain belt reaches the Yangtze River Basin, and the Yangtze River Basin enters the flood season.

In July, the subtropical high reached the middle and lower reaches of the Yangtze River, and the weather in the middle and lower reaches of the Yangtze River was hot and dry. The rain belt is in the Huanghuai River Basin, and the Huanghuai flood season. The rain belt also affects Japan.

At the end of July and the beginning of August, the ridge of high pressure crossed the latitude of 30°N, and the northern monsoon climate zone entered the flood season. Such as the Northeast Songhua River and Nenjiang.

In early September, the subtropical high withdrew from the mainland, and the rain belt withdrew south to South China. Precipitation will fall again in southern China. There is a phenomenon of "autumn rain in western China".

Unclear can continue to ask if I will.

More than that! The summer monsoon can penetrate deep inland, so there is "the spring breeze does not pass the Yumen Pass"!

In this multiple-choice question, only C is correct.

a, if the subtropical high is northerly, then the warm and humid airflow directly reaches the north and forms rainfall. In the south, there will be drought. b, as opposed to a. d, if it is easterly, water vapor always passes over the eastern region, forming a long period of rainfall.

If so, give more points! This one isn't that easy either.

Choose AC, anyway, you remember that the summer monsoon is strong, the south is dry and the north is flooded, and the summer monsoon is weak and the south is flooded and the north is dry. The reason for this is that the summer monsoon is weak, the high pressure in the north is strong, the advance is slow, and the rain band is in the south. As for the deputy high school, where is he not raining. That's it.

a The northern part of the subtropical high ridge is often a rain band, and the ridge line of the subtropical high and the interior of the subtropical high are often sunny and sunny, then item A is incorrect. b.The summer monsoon is weak, and the rainy season in the north and south is prone to drought, and b is not right c

The stronger the summer monsoon, the greater the ability to penetrate inland, the northerly the subtropical high will be, and the drought will expand in the southThe location of the subtropical high is more easterly and generally southerly, so it cannot go deep inland. There are also typhoons that move westward along the southern part of the subtropical high until the ridge line of the subtropical high and then move northward.

The easterly movement will increase the probability of a typhoon making landfall on the eastern coast.

The warm high pressure zone in the transition zone between the tropics and the temperate zone, affected by the distribution of land and sea, often breaks into several isolated warm highs, which are collectively referred to as subtropical highs. This high pressure is a long-lasting, large-scale weather system that controls tropical and subtropical regions, and its location and intensity vary with the seasons.

The warm high pressure zone in the transition zone between the tropics and the temperate zone, affected by the distribution of land and sea, often breaks into several isolated warm highs, which are collectively referred to as subtropical highs. This high pressure is a long-lasting, large-scale weather system that controls tropical and subtropical regions, and its location and intensity vary with the seasons.

East Asian summer monsoon.

Located in the southern part of the low pressure in South Asia, Southeast Asia and southwest China, the southwest monsoon prevails. Located in the eastern part of China, which is located in the east of low pressure, the southeast monsoon prevails. The summer monsoon usually affects the coast of South China in early March, then pushes northward in two ways, gradually and sharply, reaching the north of the Yellow River in July, which is the peak of the summer monsoon.

The retreat from north to south began in early September, and the complete withdrawal from Chinese mainland was made in mid-October. The Chinese summer monsoon is mainly found in tropical and subtropical oceans. It is rich in water vapor, so the summer monsoon is often closely associated with precipitation. The date of arrival in various places, which is basically the start date of the rainy season in these areas.

The summer monsoon makes the plants in the eastern part of our country rain and heat at the same time.

The Meiyu period and the rainy season in North China are closely related to the northward movement of the western Pacific high. In the rainy season in South China, due to the southerly airflow in the west bringing a large amount of water vapor from the sea, a wide range of rain bands will occur when encountering weather systems such as low pressure troughs or low vortices in the westerly wind belt. According to statistics, this rain belt is in the 5-8 latitude zone north of the western ridge line of the western Pacific high, generally in the east-west direction, affected by the distribution of sea and land, often breaks into a number of isolated warm highs, these isolated highs, collectively known as the subtropical high, are one of the main weather systems that cause drought and flood changes in summer in China.

In different parts of the subtropical high, it often causes long-term high temperature and drought in the region, but when the conditions are right, local hot thunderstorms sometimes occur; On the southern side of the western Pacific high. This high pressure is a warm high pressure zone that controls the transition between the tropics and the temperate zone; In the north and northwest of the subtropical high, it is an area with frequent typhoon activity, in its easterly airflow, south of the Yangtze River, thundershowers and torrential rain occur, there are often easterly waves formed and moving westward, affecting the east of Yunnan and Guizhou, the longer the rain belt stops, the more floods occur, and the shorter the stay time. The length of time this rain belt stays in a given area is directly related to the drought and flood in that area.

In general, long-lasting, large-scale weather systems prone to drought, subtropical regions vary in location and intensity with the seasons. The subtropical high affecting China mainly includes the western Pacific high, the Qinghai-Tibet high and the South China Sea high, among which the western Pacific high has the greatest impact on China's hunger.

The air flow is blown from the high pressure zone to the low pressure zone. In the summer. The Pacific Ocean is a zone of high atmospheric pressure.

The East Asian continent is a zone of low pressure, so the air currents blow from the Pacific Ocean to Asia. The East Asian summer monsoon is formed. Or the southeast monsoon of the city.

The pressure zone, the farther north, the greater the pressure difference in East Asia, the stronger the summer monsoon. On the contrary, the air pressure is high, the farther south. The smaller the pressure difference in East Asia, the weaker the summer monsoon.

The term "subtropical high" refers specifically to the subtropical high pressure zone in the western Pacific Ocean. The warm air mass (summer monsoon) blowing from the "subtropical high" meets the cold air mass from the north to form a frontal rain band that affects our country. The frontal rain band is generally located at 5 8 latitudes on the northwest side of the "subtropical high", and advances and retreats at the same time as the "subtropical high".

The position or strength of the subtropical high will lead to the rapid or slow advance of the "rain belt", causing many drought and flood disasters in eastern China. If the subtropical high is strong, the summer monsoon will be strong, the frontal rain belt will advance quickly to the north, and the control time in the north will be long, and there will be flooding in the north and drought in the south; If the subtropical high is weak, the summer monsoon will be weak, the frontal rain belt will move slowly to the north, and the control of the south will be long, and there will be flooding in the south and drought in the north.

The law and influence of the rain belt in China (the subtropical high is the source of the summer monsoon in China) The formation of the frontal rain belt:

When the warm and humid air flow of the summer monsoon makes landfall in the north, it meets the cold and dry air flow of the winter monsoon moving south from the north, and the lighter warm and humid air flow is lifted above the cold air. In the process of the warm and humid airflow rising, the temperature decreases continuously, condensing and causing rain, forming frontal rain, so that a frontal rain belt with more precipitation appears in the area where the cold and warm airflow converge in eastern China.

Movement of frontal rain bands:

In May, the rain bands linger in the South Ridge area;

In June, after the rain belt moved to the Yangtze River basin, it oscillated between the Yangtze River and the Huaihe River for about a month (plum rain);

In early July, the rain belt began to move northward and westward, reaching North China and Northeast China in July and August. At this time, there was a drought in the middle and lower reaches of the Yangtze River. (In June, July and August, the southwest and Guangxi regions are also affected by the southwest monsoon).

In September, the rain band moved southward;

In October, the rainy season ends.

The weather in the subtropical high pressure zone is characterized by high temperature and little rainfall. The subtropical high plays an important role in the transport and balance of water vapor, heat and energy between the middle and high latitudes and the low latitudes, and is an important system of atmospheric circulation.

The subtropical high pressure zone is located in the subtropical region near 20-30°N. Its formation is mainly due to the updraft of the equatorial low pressure belt to the air, which is affected by the pressure gradient force, and due to the influence of land and sea distribution, in summer, the subtropical high pressure belt is often cut off by the continental thermal low pressure and only remains on the ocean. The subtropical high prevails with a downdraft, and the climate is generally dry and rainless.

Sunny and hot weather.

The eastern part of the subtropical high is a strong subsidence movement area, and the downdraft is warmed by adiabatic compression, and the controlled area will have persistent sunny and hot weather.

The western part of the subtropical high is a low-level warm and moist air convergence and upward movement area, which is prone to thundershowers. With the change of seasons, the intensity and position of the subtropical high belt will also change significantly.

From January to July, the main body of the subtropical high showed a trend of moving northward and westward and intensifying. From July to January, the main body of the subtropical high moved southward and eastward, and weakened in intensity. This seasonal change also has different phases of obvious slow change and jump change.

In summer, under the control of the subtropical high, the airflow sinks, and there is no rain. In winter, the subtropical high moves to low latitudes, and the westerly wind belt in this climate zone has frequent cyclone activity and abundant precipitation, and the climate is mild and humid because the westerly wind blows from the warmer winter ocean (the difference in thermal properties between land and sea).

In the eastern part of the subtropical high, there is a big difference between the direct motion of the atmosphere in the east and west: in the eastern part of the high pressure, the sinking motion is particularly strong, and the downdraft warms due to adiabatic compression, resulting in a strong subsidence inversion, which is called a trade wind inversion.

This stratification of the strong temperature inversion is very stable (see Atmospheric Static Stability), which inhibits the development of direct lead convection and keeps the weather fine, forming a dry climate zone on the west coast of the subtropical continent See Mediterranean climate. In the western part of the high pressure, the downdraft and temperature inversion are relatively weak, so that the warm and moist air that converges and rises in the lower layers is easy to break through the inversion layer and form convection, so there are many thundershowers.

The formation principle of the subtropical high is not complicated, and the geostrophic deflection force generated by solar radiation and the earth's rotation are the two main driving forces behind it. Due to the strong solar radiation in the equatorial region, the air in the region rises, and when it reaches high altitude, it flows in a polar direction.

The geostrophic deflection force generated by the earth's rotation causes the airflow to shift continuously, and the northern hemisphere is right-to-the south, and with the increase of latitude, the deflection force of the floor tiles increases, resulting in the airflow basically becoming a flow from west to east in the subtropical region (near 30 degrees north latitude), and obstructing the follow-up air. As a result, the air over the region gathers and is forced to sink, resulting in a subtropical high.

The well-known subtropical high generally refers to the subtropical high located in the northwest Pacific Ocean of the northern hemisphere, which has a great impact on China, and it exists all year round and is a stable and inactive warm deep system. In summer, because of its high intensity, its range can occupy almost 1 5 1 4 of the entire area of the Northern Hemisphere, and in winter, the intensity and range decrease.

In most cases, the Pacific subtropical high is in the shape of an east-west flattened elongation, sometimes there are several in the center, sometimes there is one, and the changes in its intensity, scope and structure have an extremely close relationship with the weather in China.

The area controlled by the subtropical high is often hot and rainless. Typical tropical desert climate.

Due to the strong solar radiation in the equatorial region, the air in the region rises, and when it reaches high altitude, it flows in a polar direction. The geostrophic deflection force generated by the earth's rotation causes the airflow to shift continuously, and the northern hemisphere is right-to-right, and the southern hemisphere is left-shifting, and with the increase of latitude, the geostrophic deflection force increases, resulting in the airflow basically changing from west to east in the subtropical region (near 30 degrees north latitude), and obstructing the subsequent air. As a result, the air over the region gathers and is forced to sink, resulting in a subtropical high.