How is the southwest monsoon formed, and the difference between the southeast monsoon and the southw

The southeasterly trade winds in the Southern Hemisphere move northwards across the equator and become southwesterly to the right due to geostrophic deflection forces.

The difference between the southeast monsoon and the southwest monsoon is:

1. The reasons for the formation are different.

The southeast monsoon is the summer monsoon of the East Asian monsoon, which is caused by the difference in thermal properties between land and sea, and the wind blows from the Hawaiian high pressure over the ocean to the Indian low pressure on land. The southeast monsoon is generated in the subtropical high and its northwest edge, and has the characteristics of high temperature and high humidity.

The southwest monsoon is the summer monsoon of the South Asian monsoon, which is caused by the seasonal movement of the barometric wind belt. In summer, the pressure belt wind belt moves northward, and the southeast trade winds in the southern hemisphere cross the equator and become the southwest monsoon.

2. The affected areas are different.

The southwest monsoon mainly affects South Asia, while the southeast monsoon mainly affects East Asia, i.e. China.

3. The monsoon formation area is different.

The southeast monsoon region is formed from the southeast warm and humid airflow from the Gulf of Beibu in the western Pacific Ocean, and the southwest monsoon region is formed from the southwest warm and humid airflow from the Bay of Bengal in the Indian Ocean.

The monsoon is a phenomenon associated with the annual cycle, and the monsoon is one of the most typical cases of seasonal variation in atmospheric circulation. The so-called typical, namely:

1. The prevailing wind direction in winter and summer is opposite.

2. Summer: blowing from the cool ocean to the hot continent; Winter: Blowing from a cold continent to a warm ocean.

3. The summer wind must be humid and the winter wind must be dry.

The Asian monsoon system includes the Indian monsoon system (tropical monsoon) and the East Asian monsoon system. The East Asian monsoon system includes the South China Sea-western Pacific tropical monsoon and the Chinese mainland-Japan subtropical monsoon.

Annual cycles and seasonal abrupt changes of the East Asian monsoon.

Early to mid-May: South China Sea summer monsoon builds. Around the same time: the pre-flood season in South China was established.

Mid to late June: Jianghai Meiyu established, and South China entered the dry season; Indian monsoon breakout; The South China Sea monsoon trough moved to the northern part of the South China Sea.

Late July: The subtropical monsoon rain belt moved to North China-Northeast China; Jianghuai entered the drought; The monsoon trough of the South China Sea moves to the coast of the South China Sea and reaches the northernmost position of the summer monsoon.

September-October: The entire summer monsoon system retreats southward.

South Asian southwest monsoon.

Causes:1The main reason is that the difference in thermal properties between land and sea makes the wind blow from the southern ocean to the northern land, and is affected by the geostrophic deflection force.

The action formed the southwest wind.

2.The movement of the barometric pressure belt of the wind belt makes it in the Southern Hemisphere.

The southeast trade winds in the Indian Ocean cross the equator and change direction to form southwesterly winds.

These two southwesterly winds combine to form the southwest monsoon.

Causes of the Northeast Monsoon in South Asia: The difference in thermal properties between land and sea causes the wind to blow from the northern land to the southern ocean, and the northeast monsoon is formed by the geostrophic deflection force.

The southwest monsoon mainly affects the southeastern part of China, most of Yunnan and southwestern Sichuan.

The southeast monsoon mainly affects the eastern part of China.

The southwest monsoon from the Indian Ocean mainly affects southwest and southern China.

One is the southeast monsoon and the other is the southwest monsoon.

The southeast monsoon is the main force affecting our country, and it is affected by the strength of the Pacific low pressure and makes landfall at different times, bringing precipitation to the continent. Sometimes, if you come late, North China is prone to drought disasters.

However, the rainy season in the south was relatively light. On the contrary, North China is prone to flooding!

The southwest monsoon will also be affected by the low pressure of the Indian Ocean at the same latitude, blowing and blowing in our country, but blocked by the Himalayan mountains, it is difficult to reach the Chinese mainland, so a lot of rainfall will be on the south bank of the Himalayas, which is one of the main reasons why we often hear about floods in Bangladesh.

The southeast trade winds in the Indian Ocean, after crossing the equator, turn to the southwest under the influence of the earth's rotational deflection force, forming the southwest monsoon, passing through the tropical ocean, carrying a large amount of water vapor, which is the main precipitation in the Indian Peninsula and Southeast Asia. eastward through the Indian Peninsula and the Bay of Bengal, it can affect South China; When the southwest monsoon develops strongly, it can also penetrate deep into the Yangtze River basin.

The southwest monsoon is the summer monsoon that prevails in South and Southeast Asia, with the Indian summer monsoon being the most typical.

Characteristics: 1. The characteristic cycles of the southwest monsoon are mainly 41 ka and 23 ka.

2. The water vapor transport in the southwest monsoon is mainly in the zonal direction.

3. The main prevailing wind direction is southwest wind, which has obvious characteristics of staggered rainy season and dry season;

Cross-equatorial airflow, summer in the Northern Hemisphere. "Somali Rapids".

The southeast trade winds depart from the island of Madagascar in East Africa and reach the equator, and due to the northward shift of the direct sun, the equatorial depression belt weakens, and the temperature high pressure in South Asia is very low, forming an Indian depression. This stream crosses the equator and turns right into a southwesterly wind under the action of geostrophic deflection force, and continues to accelerate northward, bringing the moist air flow over the Indian Ocean to South and Southeast Asia.

Causes of the South Asian Southwest Monsoon:

The summer pressure belt and wind belt move northward, the equatorial low pressure moves to the northern hemisphere, and the southeast trade wind, which was originally located in the southern hemisphere, moves northward to the Indian peninsula, and becomes the southwest wind under the influence of geostrophic deflection force, which is the summer monsoon of South Asia. And because the southwest wind is stronger in summer than the northeast wind in winter, it is called the southwest monsoon. Dry winters and wet summers are the main climatic characteristics of the South Asian monsoon.

In summary, the causes of the South Asian monsoon can be summarized as follows: the difference in thermal properties between land and sea in winter and the movement of the wind belt in the pressure belt in summer.