What's the difference between the basement temperature and the ground temperature?

The difference between the basement temperature and the ground temperature is mainly the temperature difference.

The temperature difference between ground and underground is mainly due to the poor heat transfer function of soil. At the hottest time in midsummer, the heat wave on the ground can not be quickly transmitted to the deep soil, but can only be slowly transmitted downwards. The basement is close to the ground, and the arrival of the hottest period is close to the occurrence time of the hottest period on the ground; The farther from the ground, the greater the difference between the time of the hottest period and the ground.

For example, the surface and underground temperatures in Shanghai:

In July, the average temperature in Shanghai was 27.8℃, 0.8m underground was 24.0℃, underground 1.6m was 20.6℃, and underground 3.2m dropped to 16.9℃. So when the ground is hottest, it is very cool deep underground. On the contrary, the average temperature in Shanghai in June 65438+ 10 was 3.4℃, 9.8℃ at 0.8m underground, 1.6m underground 13. 1℃, and 3.2m underground rose to 17.3℃.

Extended data:

The geothermal heating rate varies from place to place. In Asia, the temperature will increase by 2.5℃ per 100 meter; In North America, the temperature will increase by 2 ~ 2.5℃ for every increase of 100 meter. When the temperature rises by 65438 0℃, the increased depth is called geothermal level, which is expressed in meters. The temperature that increases with the increase of 100 meter depth is called geothermal gradient (or geothermal warming rate), which is expressed in℃.

Usually, the temperature changes with the seasons. When the ground is the hottest, it is the coldest and coldest deep in the soil. When the ground is coldest, the depth of soil is warm and pleasant, so well water and deep groundwater are warm in winter and cool in summer.

In winter, because the ground is much warmer than the ground, northerners regard the cellar as a good place to store vegetables. Some small animals, such as snakes and insects, can survive the severe winter safely by virtue of the warm underground environment.

Baidu encyclopedia-underground temperature