Question

in which directions to you normally expect wind to blow in the two latitude belts of
0 degree to 30 degree north and
0 degree to 30 degree south? give reasons.
please give long answer ​

Answer 1

Answer :-

The winds in the latitude belt 0 to 30 degrees South are expected to blow

in the the northwest direction. This is due to the prevailing Southeasterly

Trade winds .

Similarly, the most frequent winds in the latitude belt 0 to 30 degrees North

are in the southwest direction, however with some geographical limitations.

While the Northeasterly Trade Winds are prevalent in the region of Pacific

ocean, South America, Saharan and Sub-Saharan Africa, the situation is

different in South and South-East Asia, where the prevailing wind changes

between southwestern and northeastern direction.

The main reason for the prevailing wind in tropics is the Hadley cell driven

by the heating of the air by the surface and the Earth’s rotation. The Earth’s

surface is generally warmest around the equator. The warm air there is

rising up to the upper troposphere, where it starts moving towards poles.

As the air cools, it encounters stronger horizontal winds at the latitude 30

degrees, and descends towards the surface.

Once the air is by the surface, it starts warming up and is pushed by the

differences in the density towards the equator. As the earth rotates and

lower latitudes have higher circumference, the air moving towards the

equator is slower relative to the surface of the Earth, and therefore the wind

starts turning towards west.

This is indeed a simplified explanation, and the zone where the hedley cells

are located shifts south and north twice during the year. Furthermore, there

are number of regional and coastal phenomena that also change wind

direction.

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