What is the formation principle of wind?

The formation of wind is mainly caused by three reasons. 1. Pressure difference. Due to various reasons, the air pressure varies from place to place. Among them, the main reason is that different places (the equator has the most light and the poles have the least light) get uneven light, resulting in temperature difference, because the atmospheric density at different temperatures is different, which will cause pressure difference. At this time, air will flow from the high pressure area to the low pressure area, forming wind.

2. Coriolis effect This is an effect caused by the earth's rotation, which means that moving objects in the northern hemisphere will deflect to the right and moving objects in the southern hemisphere will deflect to the left. The pressure difference in front will only make the air flow straight from the high pressure to the low pressure. Because the places at the same latitude on the earth get roughly the same illumination, the pressure belt on the earth is basically parallel to the latitude, and the resulting winds are also north-south. It is precisely because of the existence of Coriolis force that these north-south winds are biased east by west. For example, the famous trade wind (also called trade wind) is the wind blowing from the subtropical high to the equatorial low pressure area. Due to Coriolis force, it will deflect to the right in the northern hemisphere into a wind blowing from northeast to southwest, while it will deflect from southeast to northwest in the southern hemisphere. Another example is the typhoon, which is vortex-like due to Coriolis force.

3. Friction mainly acts near the ground. From mountains to buildings, it will have an impact on airflow. Friction slows down the air flow, making it either rise to the sky or sink to the ground (when the horizontal movement of air is blocked, it naturally develops in the vertical direction). When the air rises, the water vapor will condense to form clouds or even rain, and when it falls, the water vapor will evaporate and it will be sunny. Whether it is rising or falling, it will produce wind (when rising, the ground air decreases, forming a low pressure, and the nearby air flows to supplement it; When falling, high pressure is formed, and air flows out all around. )