What is the cause of the formation of the south Asian monsoon southwest monsoon?

The southeast trade winds in the Indian Ocean, after crossing the equator, turn southwest under the influence of the earth's rotation deviation, forming a southwest monsoon, crossing the tropical ocean and carrying a lot of water vapor, which is the main source of precipitation in the Indian Peninsula and Southeast Asia. Passing eastward through the Indian Peninsula and the Bay of Bengal can affect the southern part of China; When the southwest monsoon develops strongly, it can also go deep into the Yangtze River basin.

Southwest monsoon is a summer monsoon prevailing in South Asia and Southeast Asia, especially in India.

Features:

1 and the characteristic periods of southwest monsoon change are mainly 4 1ka and 23ka；;

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

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