Is it really hot in Yuanmou summer?

Just in April, the first solar term in summer has not yet arrived, and the temperature in Yuanjiang and Yuanmou has reached 40. 1 Celsius, ranking first in the country. In fact, it is not only Yuanjiang and Yuanmou, but also sites like Qiaojia in Yunnan, Baise, Turpan in Xinjiang and Ceheng in Guizhou. It's easy to get very hot, and the speed and height of temperature soaring are comparable to those in unusual places. The secret that they will never return on the road of high temperature and heat is: dry and hot valley!

Dry-hot valley refers to the valley with high temperature and low humidity. Generally speaking, they are mostly distributed in tropical or subtropical regions. Such areas are often rich in light and heat resources, with hot climate and little rain, and dry soil without desertification. Due to the lack of rain and light, the soil in the dry-hot valley is often dry and low in viscosity, which leads to serious soil erosion and very fragile ecology.

The reason of Yuanmou's trip to the dry-hot valley

In the valley with closed terrain, due to the influence of dry heat, the water is excessively lost, and the forest vegetation here is difficult to recover. The lack of water makes the land barren in a large area, and the topsoil on the slope of the valley loses in a large area, exposing a large area of bare soil and bare rocks. Regarding the formation of dry-hot valleys, the most important influencing factors are "foehn effect" and "local circulation effect of mountain valley wind".

Accompanied by the climate of dry-hot valley, there is another peculiar natural phenomenon-wind burning. Foehn is caused by the sinking of airflow after passing through the mountain. When a mass of air sinks from the sky to the ground, the temperature rises by 6.5 degrees Celsius on average for every drop of 1000 meters. That is to say, when the air drops to the ground from the mountain at an altitude of 4000 to 5000 meters, the temperature will rise by more than 20 degrees, making the cool climate suddenly dry and hot.