When does the northwest wind blow?

The temperature on the sea and land in our country is different. In winter, the temperature of the ocean is higher than that of the land. The air flow is always in the direction from cold air to hot air. So the winter wind always blows from the land to the southeast sea, which is why the northwest wind always blows in winter.

Asia is the most famous monsoon region in the world, and its monsoon characteristics are mainly manifested in the existence of two main monsoon circulations, namely, the northwest monsoon prevailing in winter and the southeast monsoon prevailing in summer, and their transformation has an explosive mutation process with a short transition period.

Extended data

Monsoon influencing factors

In winter, the middle and high latitudes have a great influence on land and ocean. The cold high pressure center on land is at higher latitudes, while the low pressure is on the ocean. In summer, the influence of low latitude land and sea is great, the center of land thermal depression is southward, and the position of ocean subtropical high moves northward.

The seasonal movement of planetary wind belts can also strengthen or weaken the monsoon, but it is not the basic factor. Whether the monsoon phenomenon is obvious or not is related to the size, shape and latitude of the mainland.

The continental area is large, and the seasonal high and low pressure and pressure gradient caused by the thermal difference between land and sea are also large, and the monsoon is more obvious. North America is much smaller than Eurasia, with cold and high pressure in winter and low heat pressure in summer, so the monsoon is not obvious.