2.2. Factors Related to Air Pressure and Wind

Air pressure and wind system is different at different altitude which affects the local climates of India. Consider the following factors:

♤ Distribution of pressure and surface winds.

♤ Upper air circulation and the movement of different air masses and the jet stream.

♤ Rainfall caused by the westerly disturbances in winter and the tropical depressions in south-west monsoon season.

The mechanism of these three factors can be understood with reference to winter and summer seasons of the year separately.