Analysis pressure belts and the following diagram and write 20 points about it?
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Answers
Answer:
On the earth's surface, there are seven pressure belts. They are the Equatorial Low, the two Subtropical highs, the two Subpolar lows, and the two Polar highs. Except the Equatorial low. the others form matching pairs in the Northern and Southern Hemispheres.
Explanation:
List of Idealized Global Air Pressure Belt across the globe
1. Equatorial low-pressure belt
It is located in the vicinity of the geographical equator between 50 North and 50 South latitude. It is the region of convergence of trade winds blowing equatorward from the sub-tropical belts of high pressure in the northern and southern hemispheres. Within this belt the winds are light and variable with frequent calms. Because the converging air is wet and full of excess energy, it expands and cools as it rises, creating the clouds and heavy rainfall that are prominent throughout the area. It also forms the Inter-Tropical Convergence Zone (ITCZ) and trade winds.
In this region the temperature is high throughout the year, so the air pressure is always low. It is thermally produced region. Therefore, the pressure is more uniform than that in other parts of the world.
2. Subtropical high-pressure cells
It is also called subtropical ridge or subtropical high or horse latitudes. It is situated around the latitudes of 30°N in the Northern Hemisphere and 30°S in the Southern Hemisphere. This belt owes its origin to the rotation of the Earth and sinking and settling down of wind. It is, thus mainly dynamically induced. The air rising at the equatorial belt starts blowing poleward. But these winds get deflected towards east due to rotation of the Earth. This phenomenon was first discovered by the French scientist Coriolis; hence this force exerted by the rotation of the Earth is called Coriolis force.
The quantity of force keeps increasing with increasing distances from the equatorial belts. This results in piling up of air at a height over these latitudes. The air starts descending due to cooling and resultant increase in its density. In this way high-pressure zones are created between the Tropic of cancer and 350 north latitude; and tropic of Capricorn and 350 south latitude. This is not continuous belt, but it is broken into a number of high pressure centres or cells. The dominant winds in the subtropical high are called westerlies.
3. Subpolar low-pressure cells
It is located between 60° and 70° latitudes in the Southern and Northern hemisphere. This low pressure belt is dynamically induced and is the regions of frontogenesis or temperature cyclones. It creates all the major deserts along the west coast of the continents.
4. Polar high-pressure belts
It is located between 80 degree North and 90 degree South latitude in the Northern Hemisphere and Southern Hemisphere. High pressure persists at the poles throughout the year because of the prevalence of very low temperature all the year. The air subsides in this zone due to intense cooling and results into high density.
Answer:
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