It is sunny, sunny, dry, hot in summer, large temperature difference between day and night, windy and dusty, dry in summer and wet in winter. The key is doing. Because it is dry, there is less cloud and rain, more sunshine and strong sunshine; Because it is dry, there is no cloud in the sky, which can not block some sunlight, and the ground has no water, which can not be evaporated and cooled. The heat from the sun to the ground is used to heat the earth and air, so the temperature in summer is extremely high, and the temperature difference between day and night is particularly large; Because it is dry, there are few plants on the ground.
The high temperature on the desert surface makes the temperature difference between the top and bottom of the gas layer close to the ground extremely great. The temperature distribution of cool and hot air above the atmosphere can reflect the distant scenery in front of and below the tourists, which is called the lower mirage in meteorology, commonly known as mirage. Therefore, travelers in the desert often see the blue lake in front of them. In fact, it is an inverted image of the sky in the distance, which makes them happy. On the black asphalt road in summer afternoon, we can often see a blue water on the road in front of us. This is also a trick of mirage on the road.