Write short notes on Geostropic wind and gradient wind.
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Winds tend to move parallel to isobars and pressure gradient under the influence of Coriolis force. When isobars are straight, there is less friction and winds tends to move faster, such winds are called geostropic winds.
In a low pressure system or trough, the gradient winds move at a speed less than geostropic winds and in a high pressure system or ridges, gradient winds move at a speed higher than geostropic winds.
The winds blowing almost in the same direction throughout year is are called as planetary or permanent winds. In the given diagram Trade Winds (North East and South East Trade Winds), Westerlies constitutes planetary winds.
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