The areas located between the 30°and40° parallels of latitude in both hemispheres are mostly affected by the shifting of air pressure belts - Explain with suitable examples.
Answers
Answer:
Pressure belts are created due to the heating and cooling of the air at different places and in different magnitude due to the difference in heating of the surface of the earth from the sun rays, due to the spherical shape of the earth. The latitudes of the earth can be divided into seven pressure belts, which are as follows:
1. Equatorial Low-Pressure Belt: It lies between 5 degrees north and 5 degrees south latitude around the equator. Now as direct sunlight falls on the equator, this is a region of high heat, and hence the heated air ascends upward, creating a region of low pressure. It is also called doldrums because it is a region of extreme calmness not so much as even a breeze.
2. Sub-tropical High-Pressure Belts: There are two such belts, one each in north and south hemisphere at 30-degrees latitudes from the equator, in the respective hemispheres. This is a region where the light air from the equator descends and cools down, and hence this is a region of high pressure. It is called the horse latitude.
Winds move from high to low-pressure regions and hence, the wind from here diverges, one part moves towards the equator called the Tradewinds and on to the circumpolar low-pressure region called the Westerlies.
3. Circum-Polar Low-Pressure Belts: Again there are two of these, between 60 degrees and 70 degrees in each hemisphere. Now due to the rotation of the earth, the centrifugal force due to the gravity cause the winds to go towards the equator and towards the poles, in the region near the poles, thus creating a low pressure. It is characterised by high storms in winter.
4. Polar High-pressure Belts: Two of them, between 70 degrees and 90 degrees latitude in the northern and southern hemisphere. The temperature at the poles is extremely low, characteristics of the ice caps in the region and hence the air here is dense, creating a high pressure in the region.
Shifting: The above-mentioned zones of latitudes would have remained the same if the earth were not tilted to the plane of revolution around the Sun. But as it is not so and the earth is tilted at 23 and 1/2 degrees, when the sun is overhead the Tropic of Cancer(the July month), the belts shift 5 degrees to the north of the equator; when the sun is overhead the Tropic of Capricorn(the January month), the belts shift 5 degrees to the south of the equator.
Answer:
There is a close relationship between temperature and air pressure. When the temperature is high, the air gets heated, expands, becomes lighter, and rises up creating a low-pressure area. High pressure occurs when the temperature is low. The areas between the 30' and 40' parallels of latitude in both hemispheres are most affected by the shifting of air pressure bells.
Explanation:
The apparent northward and southern marches of the sun occur from 22 December to 21 June and from 21 June to 22 December, respectively. The Tropic of Cancer in the Northern Hemisphere and the Tropic of Capricorn in the Southern Hemisphere are the furthest limits of the apparent movement of the sun. Therefore, the pressure belt swing is more apparent inside the tropical pressure belts of either hemisphere and less noticeable outside of them. This changing of the pressure belts has a significant impact on the entire world's wind system as well. The region affected by this shift in pressure belts is located between 25 and 40 degrees latitude, where trade winds prevail in the summer and westerlies in the winter. During the summer solstice, the eastern parts of the continents in this region receive rainfall from the onshore North East trade, for example. However, the offshore winds in Argentina do not bring rain to the western regions, such as Chile in South America.
learn more about it
https://brainly.in/question/48840465
https://brainly.in/question/46218182
#SPJ2