Causes of East and South Asian Monsoons

First, the causes of the East Asian monsoon

East Asian monsoon is caused by the difference of thermal properties between land and sea. In summer, the land temperature is high, forming a low pressure, and the summer monsoon blows from the subtropical ocean to the land (southerly wind); In winter, the cold land forms high pressure, so the winter wind blows from the high latitude mainland to the ocean (northerly wind), and the winter wind is strong.

The East Asian monsoon originated from the Australian high. After crossing the equator, it also became the southwest jet of the South China Sea and the western Pacific Ocean. Due to the influence of the western Pacific subtropical high, the intertropical convergence zone was formed. The southeast airflow on the south side of the subtropical high turns to the southwest airflow on the north side, which cooperates with the cold air in the north to form a Meiyu front in the Yangtze River basin.

Second, the causes of the South Asian monsoon

The reasons for the formation of South Asian monsoon can be summarized as follows: it is influenced by the difference of thermal properties between land and sea in winter and by the movement of wind belt in pressure zone in summer.

The South Asian monsoon originated from the Mascarin high in the southern hemisphere and crossed the equator along the east African coast to form the somali jet. It affects India, Indo-China Peninsula and southwest China in the form of southwest monsoon, and has a great influence on the formation of Indian monsoon trough and monsoon precipitation. ?

Extended data:

East Asian monsoon and South Asian monsoon are two independent Asian monsoon subsystems, and their dividing line is around100 e. On the other hand, these two monsoon subsystems exist in a large monsoon circulation and interact with each other.

The southwest monsoon in southern India extends eastward, which can affect the South China Sea and the Western Pacific Ocean and strengthen the southwest airflow there. The tropical depression in the South China Sea or the westward movement of typhoon will cause the development of the Bay of Bengal depression, and ultimately affect the Indian monsoon.

Baidu encyclopedia-East Asian monsoon

Baidu encyclopedia-south Asian monsoon