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Ecology

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There are many different ways in which heat is tranferred from the equator to the poles. one of which is a single circulation that air moves from the tropics to the poles and back. This such circulation model was proposed originally in the 1700's. Hadley who proposed such states that low latitiude air moves towards the equator and then it heat up. During this movement the temperature rises as well as the air rises vertically and moves the poles wards into the upper atmosphere, this is known as Hadley Cell. Such is the reason for cells that dominate the tropics and also the sub-tropics. There is another cell involved which is the ferrel cell which is a mid-latitude cell of the atmospheric circulation. In this specific cell the air moves the poles towards the ear nearer to the surface and the equator while in the west direction at higher levels. The last cell asociated is called the polar cell. The polar cell makes heat rise and then spreads it out and it then travels towards the poles. The air spreads out from the polar high and the surface winds are easterly at the surface. If the air is circuated higher than the poles, the air may then drop and form a polar high. There is also the factor of solar equator which si the latitutde beneath the sun. the sun is positioned there vertically only at midday. The solar equator varies during the year because of our earth orbit. In more of the cold or polar areas the rays from the sun strike the earth in a slant and then less energy is delivered to the tropics. Seasonal variation in temperature and day length increases with latitude because of the rotation of the axis. Global temperature diffrentials happen to create winds and drives the atmospheric circulation. Atmospheric circulation is a huge movement of air where energy is distributes on the surface of the earth. From year to year out atmospheric circulation changes due to...

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