Why is there a tropical desert climate and a Mediterranean climate on the west coast and a monsoon climate on the east coast?

The middle and low latitudes are affected by subtropical high all the year round at 20 ~ 30, with strong downward airflow, less precipitation, clear weather and large evaporation, which is easy to form a tropical desert climate; In East Asia, due to the strong difference of thermal properties between land and sea, and the Qinghai-Tibet Plateau blocking the northward shift and eastward shift of southwest monsoon, it brought a lot of precipitation to the eastern part of China, forming a monsoon climate.

The Mediterranean climate is northward relative to the tropical desert climate, which belongs to the alternate control of subtropical high and westerly belt. In summer, the subtropical high controls high temperature and little rain, and in winter, the pressure belt moves south, so the westerly belt is controlled. Because the westerly belt blows from the ocean to the west of the mainland, the temperature of the mainland is lower than that of the ocean in winter, and the dew point temperature decreases, which brings a lot of precipitation. When the westerly belt passes through the mountains and reaches the eastern part of the continent at the same latitude, the water vapor has basically dropped, so the eastern part of the continent is still dominated by continental climate.

In addition, the most fundamental driving force of ocean currents and wind directions is the rotation of the earth from west to east, and the angular velocity at low latitudes is greater than that at high latitudes. In addition, in the ocean and atmosphere, the northern hemisphere rotates counterclockwise and the southern hemisphere rotates clockwise, so the approximate path of ocean currents and winds is clear. ...