Geography: Why are the temperatures different in spring and autumn?

Solar photothermal is called solar radiation, and it is ground radiation that directly affects the temperature. Solar radiation must be absorbed by the earth first and then converted into ground radiation, thus raising the temperature.

The influence of the sun's light and heat is not immediate, nor does it mean that the temperature rises as soon as the sun comes out. At the vernal equinox, the sun just came from the southern hemisphere, and the heat was absorbed by the earth but not yet converted into ground radiation. In summer and half a year, the sun radiates a lot, and the earth's interior is full of energy, so the temperature is still relatively high due to ground radiation at the autumn equinox.

It is not that the temperature of the atmosphere is mainly controlled by solar photothermal, and the influence of heat in the earth is less than that of the sun, but that ground radiation is the direct factor affecting the temperature, and solar photothermal works through the ground.