Why is the temperature difference between day and night large in the desert?

The reason why the desert is hot during the day and cold at night is inseparable from the sand and stones in the desert. Because the specific heat of sand is less than that of air, when the surface of the earth absorbs the radiant heat of the sun during the day, the temperature of sand with the same mass is higher than that of air near the ground, and the heat is transferred from sand to air.

At the same time, due to the small specific heat of sand and gravel, the air near the ground also heats up rapidly, and the air convection heats up the air in desert areas rapidly;

At night, the surface radiates heat to the air, the air convection, the sand and stone exchange heat with the cold air near the ground, and then the sand and stone are cooled and transferred to the air.

Extended data:

Desert areas are often clear and cloudless in Wan Li, and the wind is strong, with the maximum wind reaching hurricane level. Cause of formation of tropical desert: it is mainly covered by subtropical high, and the air sinks and warms, which inhibits surface convection and is difficult to cause rainfall.

If it is blocked by high mountains and located inland or on the tropical west coast, it can form a desert. For example, the desert in the Australian mainland is formed because all the water has been lost when the sea breeze comes. Sometimes, the leeward side of the mountain will also form a desert.

The material desert on the ground is not all sandy ground, but more common is rockfill ground or rock ground; There are lakes and oases on the ground.