Wind belt problem: Why is it called polar easterly wind, prevailing westerly wind, northeast trade wind and southeast trade wind? Don't give theoretical answers!

Polar easterly wind is a geographical name, that is, the wind blowing on the polar easterly belt. It blows from the North and South Pole to the temperate zone. The prevailing westerly wind, also known as the mid-latitude westerly wind, flows from the subtropical high belt near 30 degrees north and south latitude to the subtropical low belt near 60 degrees north and south latitude. Due to the deviation of the earth's rotation, the prevailing westerly winds are southwest winds to the right in the northern hemisphere and northwest winds to the left in the southern hemisphere. However, they all tend to blow from low latitude to high latitude. For the west coast of the mainland in mid-latitude areas (especially between 40-60 degrees), the prevailing westerly wind can bring warm and humid air flow at sea, which makes the local climate have obvious maritime characteristics: the daily temperature difference is less than that of annual range, the annual precipitation is average, and there is more winter rain. Think about the umbrella in the hand of Sherlock Holmes, a British detective, and think about the Premier League in winter, all of which reflect the maritime climate characteristics under the control of the prevailing west wind.

The low latitude trade winds flow from the subtropical high to the equator. Because of the earth's rotation bias, they are northeast trade winds to the right in the northern hemisphere and southeast trade winds to the left in the southern hemisphere. But there is a tendency to blow from high latitude to low latitude. For the central and western parts of the mainland at low latitudes (especially near the Tropic of Cancer), the trade winds at low latitudes are relatively dry, which makes the local precipitation scarce. Mostly grasslands or deserts.

The east coast of the mainland is generally occupied by monsoon climate, which is hardly affected by trade winds and westerly winds. When the air in the subtropical high in the northern hemisphere moves southward, it moves to the right of the pressure gradient force due to the influence of the earth's rotation bias, forming the northeast wind, that is, the northeast trade wind. When the air in the subtropical high in the southern hemisphere moves northward, due to the influence of the earth's rotation bias, the air moves to the left of the pressure gradient force, forming the southeast wind, that is, the southeast trade wind. India's southeast trade winds cross the equator and turn to the southwest monsoon.

Under the influence of the southeast wind, the precipitation in the Amazon plain is more abundant.

East Madagascar in Africa is also affected by the southeast trade winds.