Write an essay on the cyclone amphan 250-300 words nothing more or
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Answer:
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Explanation:
The cyclones are irregular wind movements involving closed air circulation around a low pressure centre. This closed air circulation is caused by atmospheric disturbances over and above the earth’s surface, coupled with the earth’s ‘rotation which imparts to these disturbances a whirling motion.
Cyclones are associated with destructive and violent disturbances, such as heavy squalls and torrential rainfall.
Significance of Cyclones:
The cyclones level down inequalities of pressure and wind movement over the globe. They play an important role in the complex process of heat exchange between various latitudinal zones. Cyclones have a bearing over the phenomenon of precipitation, especially in mid-latitude regions, by lifting up the moist air from oceans and taking it into the surrounding landmasses.
The cyclonic wind movements are anti-clockwise in the northern hemisphere and clockwise in the southern hemisphere. The cyclones are often characterised by existence of an anticyclone between two cyclones. Depending on their area of origin and principal tracks followed, the cyclones can be either tropical or temperate/extra-tropical.
1. Tropical Cyclones:
Origin and Development:
The tropical cyclones have a thermal origin, and they develop over tropical seas during certain seasons. At these locations, the local convectional currents acquire a whirling motion because of the Coriolis force generated by the earth’s rotation. After developing, these cyclones advance till they find a weak spot in the trade wind belt.
The ideal conditions for the development of tropical cyclones are:
(i) Quiet air
(ii) High temperature
(iii) Highly saturated atmospheric conditions.
Such conditions exist over the equatorial doldrums, especially in western margins of oceans, which have great moisture carrying capacity because the trade winds continuously replace the saturated air. Also, the whirling motion is enhanced when the doldrums are farthest from the equator. This happens during the autumnal equinox (August-September). At this time, there are two advantages—the air is overheated and the sun is exactly over the equator. The source of energy for the development of tropical cyclones is latent heat of condensation.
Cyclones are violent storms that are accompanied by rain, thunder and lightning. In general, a cyclone blows in the form of small circles but moves in different directions. Cyclones impact warm countries of the world including India
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