What's the climate like on the Qinghai-Tibet Plateau?

The atmospheric pressure at sea level is 10 1.3kPa(760mmHg), which is called atmospheric pressure. The oxygen concentration (volume percentage) in the atmosphere does not change with altitude and is constant at 20. 95%. Oxygen partial pressure = atmospheric pressure × oxygen concentration, so the sea level oxygen partial pressure is 2 1.2kPa( 159mmHg).

The higher the altitude, the lower the atmospheric pressure and the lower the oxygen partial pressure. With the increase of altitude, the boiling point of water also decreases. Generally speaking, the atmospheric pressure drops by 0.7kPa(5mmHg) and the boiling point of water drops by 0.33℃ per altitude 100 m.

Clear rainy season and dry season:

Due to the hot low pressure in summer, wet and warm precipitation weather appears on the plateau, and cold and high pressure in winter forms dry and cold windy weather, and the unique plateau monsoon changes obviously in dry and wet seasons. The westerly belt in winter controls the plateau area as dry season; In summer, influenced by the humid southwest monsoon and southeast monsoon, the precipitation increased obviously. Therefore, there is an obvious phenomenon of alternating dry and wet seasons.

In addition, the precipitation on the Qinghai-Tibet Plateau is characterized by thunderstorms, hail and night rain. Even in summer, the snow on the plateau above 5000 meters above sea level will not melt all the year round. In addition, the plateau has a typical continental climate, with high temperature at noon and low temperature in the morning and evening, and the temperature difference in one day can reach 15~30℃.