Why is the land temperature higher than the ocean in summer and the opposite in winter?

The specific heat capacity of land (soil) is less than that of ocean (seawater). When they are exposed to the sun at the same time, the land heats up faster than the ocean. Similarly, they emit the same amount of heat at a certain moment, while the specific heat capacity of land is less than that of ocean, and the land cools faster and the temperature is lower than that of ocean.

The hot air rises upward, so that it stays at the bottom in vertical space, and needs to be supplemented by the surrounding air (cold air is dense and heavy at the bottom of the atmosphere), so that the air begins to flow and form wind, which is called monsoon because it is caused by seasons.

Heating and cooling are affected by ambient temperature, so the heating and cooling rates in different seasons are different!