Machine-translated by Google. Questions are authored in English.
Top

Discussion

Which balance must hold for the thermal wind relation to be valid?

  • A.Gradient wind balance alone, since it is the more general of the two horizontal balances available
  • B.Cyclostrophic balance
  • C.Ekman balance, because friction is what couples the wind at one level to the wind at the level above
  • D.Both geostrophic and hydrostatic balance

Answer: D

The relation is derived by combining geostrophic and hydrostatic balance, so it fails wherever either does, which means near the equator, in strongly curved flow and in convective systems. A gradient wind version exists but is much more complicated and rarely used. Cyclostrophic and Ekman balances are quite different regimes in which no simple thermal relation applies at all.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.