What are the factors that affect the daily temperature range?

Daily range refers to the difference between the highest temperature and the lowest temperature in a day, and the size of daily range reflects the degree of temperature change. Usually, the highest temperature in a day appears between14 and15, and the lowest temperature appears around sunrise. Due to the influence of season, latitude and weather, the sunrise may be advanced or postponed.

Latitude of factors affecting daily temperature range

The diurnal range decreases with the increase of latitude, because the change of solar height in a day decreases with the increase of latitude.

season

Generally speaking, the daily temperature difference in summer is greater than that in winter, but in the middle and high latitudes, the highest daily temperature difference generally appears in spring. Although the sun's altitude angle is large at noon in summer, the sunshine time is long, and the temperature is high during the day, but the temperature in the middle and high latitudes is also high at night, so the daily temperature difference in summer is not as big as that in spring.

zone

The diurnal temperature range of low concave terrain (basin and valley) is greater than that of flat land, and that of flat land is greater than that of convex land (hill). Low-concave terrain has large air contact area, poor ventilation during the day and poor heat dissipation, and low-temperature mountain wind is often blown at night, so the daily temperature difference is large.

The upper part of the protruding terrain has a small area, high altitude, and the temperature is mostly regulated by the surrounding air, so it is not easy to rise and fall at night and the daily temperature difference is small.

The flat land is in between.

The plateau is bigger than the plain: the plateau area has high altitude, thin atmosphere, strong solar radiation during the day and rapid temperature rise. At night, the atmospheric inverse radiation is weak, the heat dissipation is fast, the temperature drops rapidly, and the daily temperature difference is large. The plain area is low and flat, because of evaporation and other effects, the cloud amount is large, the solar radiation is weakened during the day, and the atmospheric inverse radiation is strong at night, which plays the role of ground insulation, so the daily temperature difference is small.

underlaying surface

The different properties of the underlying surface make the specific heat capacity different, so the absorption of solar radiation is different, which leads to different daily temperature difference changes. For example, the daily temperature difference on land is greater than that on the ocean.