Geostopic winds are high altitude winds which flows parallel to the isobars Which of the following s...........

Geography Atmosphere

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Geostopic winds are high altitude winds which flows parallel to the isobars. Which

of the following statements are correct about Geostopic winds?

1. The net force on geostopic winds is zero.

2. The friction does not act on geostropic winds.

3. The winds blow with varying speed.

Select the code from below:

1&2 only

1&3 only

2 only

1,2&3 only

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Explanation:

The velocity and direction of the wind are the net result of the wind generating forces. The
winds in the upper atmosphere, 2 - 3 km above the surface, are free from frictional effect of
the surface and are controlled mainly by the pressure gradient and the Coriolis force. When
isobars are straight and when there is no friction, the pressure gradient force is balanced by
the Coriolis force and the resultant wind blows parallel to the isobar. This wind is known as
the geostrophic wind. Since, these winds blow with a uniform speed, statement (3) is wrong.
Hence (a) is the correct answer.