What is the main reason for the dry climate in Tarim Basin, Xinjiang?

The reason is that it goes deep inland, far away from the sea, surrounded by tall mountains, and it is difficult for the humid airflow of the ocean to penetrate. The topography of the basin is close to the Siberian high, with little precipitation and large evaporation throughout the year. The topography of the basin is high in the west and low in the east, and slightly inclined to the north, which is the lowest point of the basin.

Tarim basin belongs to warm temperate climate, and the annual total solar radiation reaches 575 ~ 627 kJ/cm2. The annual sunshine hours are about 3000 hours in the north and less than 3000 hours in the south. It's windy and dusty. The annual average temperature is 9 ~ 1 1℃, which is slightly higher in the south than in the north. Continental nature is strengthened from west to east. It is colder in the east than in the west in winter, and the monthly average temperature is 1. Ruoqiang is 3.2℃ lower than Hotan and 2.4℃ lower than Kashgar.

The average temperature in winter is below -20℃, and the freezing days are only 1 ~ 2 days. The average temperature in July is 25 ~ 27℃. The active accumulated temperature above 10℃ exceeds 4000℃, which is higher in the south than in the north; Its duration is 200 days in the south and 190 days in the north. The accumulated temperature varies greatly every year. The frost-free period is more than 200 days, 200 ~ 2 10 days in the north and as many as 220 days in the south. The annual average daily range of temperature is 14 ~ 16℃, and the maximum daily range is 25℃.

The reasons for the dry climate in Tarim Basin are: living in the deep inland, far away from the ocean, blocked by the terrain, the water vapor in the ocean is difficult to reach, the air is dry, the precipitation is scarce, and the climate is dry.