Geography

Air Masses When the air remains over a homogenous area for a sufficiently long time, it acquires the characteristics of the area. The homogenous regions…

Pressure and Wind Direction The velocity and direction of the wind are the net results of the wind generating forces. The wind blows because of…

General circulation of the atmosphere The circulation of wind in the atmosphere is driven by the rotation of the earth and the incoming energy from…

General Atmospheric Circulation and its Effects on Oceans Atmospheric circulation is the movement of air at all levels of the atmosphere over all parts of…

World Distribution of Sea Level Pressure The world distribution of sea level pressure in January and July has been shown in Figures 1 and 2.…

Horizontal Distribution of Pressure Small differences in pressure are highly significant in terms of wind direction and velocity. The distribution of atmospheric pressure across the…

Coriolis force Affecting the Velocity The rotation of the earth about its axis affects the direction of the wind. This force is called the Coriolis…

Forces Affecting the Velocity and Direction of Wind The main factors that affect wind direction and speed are the pressure-gradient force, the Coriolis force, and…

Distribution of Temperature in Earth Surface The global distribution of temperature can well be understood by studying the temperature distribution in January and July. The…

Vertical Variation of Pressure in Earth Surface In the lower atmosphere, the pressure decreases rapidly with height. The decrease amounts to about 1 m for each…