| Planetary
Boundary Layer |
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| • | Because
of friction the air |
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| near
the ground moves |
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| slower
than the air above. |
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| – | Friction
layer |
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| – | Planetary
boundary layer |
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| • | With
more vertical mixing of |
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| the
air (e.g. unstable |
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| atmosphere)
the difference in |
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| speed
is smaller. |
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