Why does the temperature drop slower in mountainous areas at night than in plains?

The difference of topography and landform also has obvious influence on temperature.

On the convex terrain such as the top of the mountain, due to the small contact area with the land surface, it is less affected by the ground heating in the daytime and cooling at night, and because of the high wind speed and strong turbulent exchange, the cold air near the ground can sink along the slope at night to exchange warmer air in the free atmosphere, so the daily temperature difference and annual temperature difference are small; On the other hand, the depression has the opposite topography, poor airflow and weak turbulence exchange, and is surrounded by surrounding hillsides. Under the strong sunlight during the day, the ground temperature rises sharply, which affects the lower temperature, and the ground heat dissipates quickly at night. Due to the sinking of cold air, the valley bottom and basin bottom are particularly cold, so the daily temperature difference is very large.