Causes of South Asian Summer Monsoon

It is caused by the seasonal movement of the pressure belt and wind belt, and is also affected by the thermal difference between land and sea and topographic factors. In summer, the pressure belt and wind belt move northward, and the equatorial depression moves to the northern hemisphere. The southeasterly trade winds originally located in the southern hemisphere moved northward to the Indian Peninsula, and became southwesterly winds due to geostrophic bias, which is the summer monsoon in South Asia. Because the southwest wind in summer is stronger than the northeast wind in winter, it is called southwest monsoon.

Most of South Asia has a tropical monsoon climate, which is divided into hot season (March-May), rainy season (6-65438+1October) and cool season (165438+1October to February of the following year). The temperature is high throughout the year and the precipitation changes greatly. The rainfall on the windward slope of the southwest monsoon is extremely rich, which is one of the highest rainfall areas in the world (such as Kira Bangqi, India). There is less precipitation in northwest China.

South Asian monsoon refers to the monsoon that affects southern Asia (Indian Peninsula, Indo-China Peninsula and southwest China), among which the Indian Peninsula is the most typical, so it is named South Asian monsoon.