Why is there much night rain on the Qinghai-Tibet Plateau?

The dynamic and thermal effects of the Qinghai-Tibet Plateau are important reasons for the unique climate of the plateau, among which solar radiation is the main energy source of the dynamic and thermal effects of the Qinghai-Tibet Plateau. It not only has an important influence on the temperature, climate and weather types in this area, but also is the main energy source for the formation of unique ecological phenomena in the plateau. . In the general precipitation season, there are more clouds, less total solar radiation, larger diurnal range and smaller annual range. The distribution of precipitation in the Qinghai-Tibet Plateau is influenced by the southwest monsoon, and the precipitation varies greatly in different regions. The precipitation difference between the area with the largest precipitation and the area with the smallest precipitation is 200 ~ 300 times. The average precipitation in southeastern Tibet is over 4000mm, and the annual precipitation in Pasigart is 4500mm, which is one of the centers with the most precipitation in China. Therefore, it gradually decreases to the northwest of the plateau. The annual precipitation in the northwest of Qaidam Basin is only about 200 mm, and the average annual precipitation in the whole northern Tibet Plateau is only 300 ~ 500 mm. It can be seen that the seasonal distribution of precipitation in various regions of the plateau is extremely uneven, and the differentiation between rainy season and dry season is very obvious. Except the rainy season (June-September) on the southern slope of the Himalayas accounts for about 60% of the annual precipitation, the precipitation in other areas of the plateau generally accounts for about 90% of the annual precipitation. The daily variation of plateau precipitation is also very obvious, and the precipitation often comes quietly with the arrival of night, and the night rain rate is above 50%. Scientific research shows that night rain is beneficial to the growth of various plants.