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Which layer typically shows the largest thermal wind in mid-latitudes?

  • A.The middle and upper troposphere
  • B.The boundary layer, where the surface temperature contrast between land and sea is at its sharpest
  • C.The lower stratosphere
  • D.The layer immediately above an inversion, where the temperature increases with height over a shallow depth

Answer: A

Although the surface temperature gradient may be sharp, the deep gradient through the middle and upper troposphere accumulates the greatest shear because the relation integrates over depth. This is why the strongest winds are found near the tropopause. Boundary layer gradients act over too shallow a depth, and the lower stratosphere has a reversed gradient that reduces the wind again.

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