Influencing factors of temperature difference between day and night

The influencing factors of temperature difference between day and night mainly depend on latitude, height and land and sea position.

Usually the latitude is high and the temperature difference between day and night is large; High altitude, large temperature difference between day and night; In the mainland far from the ocean, the temperature difference between day and night is very large.

What are the factors that affect the temperature difference between day and night?

Latitude: high latitude > low latitude

Altitude: annual temperature difference: low altitude > high altitude (Northeast Plain > Qinghai-Tibet Plateau)

Daily temperature difference, high altitude > low altitude (altitude affects the thickness of the atmosphere, the insulation effect of the atmosphere and the weakening effect of the atmosphere)

Underlying surface: wasteland > forest > lake.

Weather conditions: sunny > cloudy.

Land and sea location: inland > coastal.

(1) underlying surface properties: large specific heat capacity, slow ground temperature rise and fall, and small temperature difference between day and night. For example, the ocean temperature difference is generally smaller than that on land.

(2) Weather conditions: On sunny days, the weakening effect of the atmosphere on solar radiation during the day and the heat preservation effect of the atmosphere on the ground at night are weak, and the temperature difference between day and night is large. Cloudy days are the opposite.

Northwest China, living inland and far from the ocean, has a temperate continental climate with strong sunlight and large temperature difference between day and night.

The Qinghai-Tibet Plateau has a high altitude and thin air, which has little weakening effect on solar radiation, strong solar radiation, weak reverse radiation at night, poor heat preservation and large temperature difference between day and night.

Why is the diurnal range of convex land small and concave land large?

The starting point of analyzing the daily range is to find out the reason why the temperature is the highest in the daytime and the lowest in the early morning. When the temperature is high during the day, the daily range will be large when the temperature is low in the early morning. On the contrary, the daily range will be small when the temperature is high or low during the day and night.

Convex land (ridge land) is relatively open, exchanges with the surrounding atmosphere frequently, and heat is easily lost during the day. Due to high altitude, the temperature will not be too high; At night, cold air is easy to sink into the valley, and the atmosphere in the convex land is higher than the ground, which is less affected by the divergent cooling of the ground, so the temperature near the convex land (ridge) changes little, so the daily range of the convex land is small.

However, the concave land (valley) is not easy to exchange heat with the outside world because of its relatively closed terrain, and the temperature is relatively high during the day, while the temperature difference between day and night is large due to the sinking and accumulation of cold air at night, so the daily temperature difference of the concave land is large.

Why do you say: high altitude, large temperature difference between day and night?

This is a conclusion drawn by comparing the plateau with the plains of the same latitude, such as the Qinghai-Tibet Plateau and the Sichuan Basin. The plateau is high in altitude and the air is thin. During the day, the atmosphere has a weak weakening effect on solar radiation, and at night, the atmosphere has a weak heat preservation effect on the ground, resulting in a large temperature difference between day and night.