Discussion
Statement I: Friction acts throughout the depth of the troposphere.
Statement II: Friction is confined mainly to the planetary boundary layer.
In the light of the above statements, choose the correct answer.
Answer: B
Turbulent stress transmits surface drag upward only through the lowest kilometre or so, and above that the free atmosphere behaves as very nearly inviscid on the timescales of weather. The first statement is therefore wrong. This confinement is what makes the boundary layer a distinct object of study and what allows free tropospheric dynamics to be treated with frictionless equations to a good approximation.
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