Traditional Culture Encyclopedia - Weather inquiry - What is the symbol of weather and wind?
What is the symbol of weather and wind?
In the weather forecast, we often hear the expression "the north wind is 4 to 5", in which the wind refers to the average wind; If you hear the phrase "gust 7", gust refers to the wind with high and low speed, and the wind at this time refers to the high-speed wind.
Wind is caused by air pressure difference.
When the air pressure difference exists, the air will move from the high pressure area to the low pressure area, thus producing winds with different wind speeds. On a rotating planet outside the equator, the airflow will be deflected by Coriolis force.
On a global scale, the two main driving factors of large-scale wind (atmospheric circulation) are the difference in heating between the equator and the polar regions (the difference in absorbing solar energy leads to buoyancy) and the rotation of the planet.
In high altitude areas outside the equator, which are not affected by ground friction, large-scale winds often reach geostrophic balance. On the surface of the earth, friction will gradually slow down the wind. Surface friction will also cause more wind to blow to the low pressure area.
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