Jet Stream
Jet Stream
Velocity of the jet stream decreases over the oceans and increases when it is over continents?
I read that the speed of jet stream is more over the continents than on oceans...
Close to the Earth's surface, friction reduces the wind speeds but the jet streams are air currents that blow at an altitude of 10-12 km...Does the earth's surface effect its velocity ?
Friction is not really a factor since jet streams exist well off the surface (other than low level jets). Jet stream are driven by temperature gradients in the atmosphere. The stronger the gradient, the stronger the jet stream. Oceanic areas tend to have weaker gradients than land areas simply because ocean areas tend to warm and cool slower than land. Thus over land relatively warm and cold air masses can lie quite close to each other. As a result the temperature gradients in the atmosphere tend to be greater, especially in the wintertime, which in turn is when the strongest jet streams are typically observed.
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How Does The Jet Stream Work?
Jet Stream
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