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atmospheric general circulation

is essential to study the time to have at least a slight idea of \u200b\u200bwhat is the circulation of air in the atmosphere and the movement of cells warm and cold air, which along with ocean currents redistribute heat in the Earth. 'd Better go see him for helping parties of different images:

image obtained http://www.dgeo.udec.cl/wiki/index.php/Circulaci% C3% B3n_de_la_atm%

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The tilt of the Earth produces differences in the incidence of the rays of the sun, being equatorial and tropical zone that receives more light and energy (producing more heat), leaving the less polar lit (therefore colder). The differences tend to balance and produce the movement of air masses with different pressures resulting in atmospheric general circulation

This creates a series of convective cells in each hemisphere to work autonomously and cause as the high-latitude areas predominate pressure (above the tropics) and low pressure (as the equatorial area.) In areas of contact between high and low pressure results in greater instability which favors the appearance of fronts that bring procipitaciones inportant, in the northern hemisphere this area is called the polar front.

image obtained http://homepage.mac.com/uriarte/circulacionleroux.html

Nuesto During the northern hemisphere winter what usually happens is that the cyclonic air masses of polar origin move further south being conducted by the relief of the great mountain ranges, making alternate in the middle latitudes powerful storms with warm, moist air that bring rainfall and cyclone cold air compounds (hence the talk of polar air) dry, generating calls cold waves.

Isobar map showing the influence the Azores anticyclone in summer. Image obtained from http://www.ebrisa.com/portalc/media/media-S/images/00015777.jpg

However, during the summer masses of tropical cyclones are located farther north, displacing the polar front (area where storms are associated with large foreheads) to higher latitudes, leaving most of southern Europe under the influence of called the Azores anticyclone, resulting a very stable time, marked by clear skies and high temperatures, which may increase further with the arrival of winds south from the Sahara, are called heat waves .

To learn more about the functioning of the atmospheric circulation can visit these pages:
http://www.ambientum.com/enciclopedia_medioambiental/atmosfera/La-circulacion-general-de-la-atmosfera.asp
http : / / www.atmosphere.mpg.de/enid/2__Sistemas_de_circulaci_n/-_Circulaci_n_global_3bg.html
http://www.ujaen.es/dep/fisica/lec7.pdf