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Solar heating of the atmosphere, differential heating of water and land masses, rotation of the Earth and the Coriolis effect it causes are the sources of global wind patterns.
To understand the global wind patterns it is best to first view the Earth as a fixed (non rotating) planet. (www.bom.gov.au/info/ftweather/ images/hadley3.gif) As you can see in the absence of the Coriolis effect the cold air from the poles and the warm air from the equator create 4 distinct convection cells.