can anyone tell me what are hadley cell, ferrel cell nd polar cell?

Answer 1

This is a very good question Gabriela. Let me try to answer it for you. These terms you have used are related to the general circulation of the atmosphere. In this circulation there are three cells of vertical circulation. Try to picture a cross-section of the earth. At the equator the air rises with heating and in the upper atmosphere begins to flow toward the north. At about 30 degrees north latitude it sinks and flows back toward the equator forming the easterlies in the band from 30 N to the equator. This cell is the Hadley circulation. Between 30 N and about 60 N there is a similar circulation but in a reverse mode. It flows at the surface from 30 N to 60 N where it rises along the Polar front and returns aloft by flowing southward where it sinks at 30N. This cell is called the Ferrel cell. Finally, north of 60 N there is the Polar cell which in the upper atmosphere flows toward the Pole where it sinks and flows southward near the surface. Where the Ferrell and Hadley cells sink at 30 N we have the Horse latitudes an area of generally high pressure. The Ferrell cell flow at the surface is the cause of the westerlies. And with the Polar cell the surface winds are called the polar easterlies. This same pattern is repeated in the southern hemisphere. I hope this helps explain these terms a little better for you.

Answer 2

Ferrel Cell

Answer 3

Polar Cell

Answer 4

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Polar, Ferrel and Hadley cells are all large scale atmospheric circulatory systems - air moving about the globe. The polar high and the polar cell are not the same thing, but they are related. The polar high is part of the polar cell. Cold air sinks at the poles and causes high atmospheric pressure. This is the polar high. This air flows away from the poles as the polar easterlies. At about 60 deg latitude it meets air from further north (in the southern hemisphere, or south in the northern hemisphere) and rises again. It then splits and either flows back to the pole, completing the polar cell, or heads equatorwards in the Ferrel cell.

Answer 5

These are all circulations from an older model of the circulations of the atmosphere.

Hadley cell: near equator, has a thermally direct circulation. Transports energy to the north to the ferrel cell.

Ferrel cell: Middle circulation, replaced by Rossby waves in the current circulation model. Has a thermally indirect circulation.

Polar cell: Near poles, has a thermally direct circulation. Almost all energy transported here.

Answer 6

They are all vertical motions in the atomosphere, but different from each other. See this site for easy explanations and pictures:
http://ag.arizona.edu/~lmilich/dry.html