CBSE Class 11 Geography Chapter 10 Atmospheric Circulation and Weather Systems Notes
Atmospheric Pressure is the weight of a column of air contained in a unit area from the mean sea level to the top of the atmosphere. Atmospheric Pressure is measured by an instrument called ‘barometer’. Atmospheric Pressure is expressed in the units of Millibars and Pascal. Pressure belts are unstable. They oscillate with the movement of the Sun.
The forces, which affect the velocity and direction of the wind, are: Pressure Gradient Force Frictional Force and, Coriolis Force Pattern of the movement of planetary winds depends on: Latitudinal variation of atmospheric heating Emergence of pressure belts Migration of belts following apparent path of the Sun Distribution of continents and oceans Rotation of the earth Movements of air repetitively and predictably, driven by changes in the weather patterns are called seasonal winds. Differential heating and cooling of the earth’s surface can create several local or regional winds. Please refer Class 11 Geography Chapter 10 Atmospheric Circulation and Weather Systems Notes for more information.
CBSE Revision Notes 