ATMOSPHERIC CIRCULATION WEATHER SYSTEMS - NCERT

ATMOSPHERIC CIRCULATIONAND WEATHER SYSTEMSE arlier Chapter 9 described the unevendistribution of temperature over thesurface of the earth. Air expands whenheated and gets compressed when cooled. Thisresults in variations in the atmosphericpressure. The result is that it causes themovement of air from high pressure to lowpressure, setting the air in motion. You alreadyknow that air in horizontal motion is pressure also determines whenthe air will rise or sink. The wind redistributesthe heat and moisture across the planet,thereby, maintaining a constant temperaturefor the planet as a whole. The vertical rising ofmoist air cools it down to form the clouds andbring precipitation. This chapter has beendevoted to explain the causes of pressuredifferences, the forces that control theatmospheric CIRCULATION , the turbulent patternof wind, the formation of air masses, thedisturbed WEATHER when air masses interactwith each other and the phenomenon of violenttropical PRESSUREDo you realise that our body is subjected to alot of air pressure.

convergence, some eddies, convection currents, orographic uplift and uplift along fronts cause the rising of air , which is essential for the formation of clouds and precipitation. Figure 10.4 : Geostropic Wind General circulation of the atmosphere The pattern of planetary winds largely depends on : (i) latitudinal variation of atmospheric

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