Global atmospheric circulation consists of the observed wind systems with their annual and seasonal variations and is the principal factor in determining the distribution of climatic zones. The two major causes of global wind circulation are inequalities in radiation distribution over the Earth's surface and the Earth's rotation. Global radiation distribution drives global circulation, whereas the Earth's rotation determines its shape. Basically, the mean surface circulation consists of easterly winds with equatorial components in the tropics and westerly winds with poleward components in middle latitudes, the corresponding meridional flows aloft being reversed. Weak surface easterlies are found in the polar regions, and extensive areas of calms are found in the equatorial and subtropical regions. Strong, upper westerly winds are found poleward of about 25°N and 25°S.
Causes of the Global Atmospheric Circulation
Radiation Distribution
The planet Earth receives energy from the sun in...
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Lockwood, J.G. (1987). Atmospheric circulation, global . In: Climatology. Encyclopedia of Earth Science. Springer, Boston, MA. https://doi.org/10.1007/0-387-30749-4_20
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