ABSTRACT
The atmospheric wind system is driven by the sun. The earth’s atmosphere is more or less transparent to the radiation. Only ultraviolet radiation is absorbed by Ozone in the stratosphere. Meteorologists collect observations of the atmosphere like pressure, temperature, wind, humidity etc., for weather forecasting. The basic equations of the atmosphere are integrated numerically to simulate general circulation, climate, monsoon etc. There have been attempts to simulate intraseasonal, interannual, and decadal and century and longer scale variability of climate. Over the equatorial Pacific notice the east-west Walker circulation with easterlies in the lower troposphere, rising motion over equatorial western Pacific, westerlies in the upper troposphere and sinking motion over equatorial eastern Pacific. The Himalayas also help to confine the lower tropospheric moist monsoon winds to the south of the Himalayas. Even the east African topography has been shown to be important for monsoon circulation.
