Discussion
Match each wind with what it describes.
List I
A. Geostrophic
B. Thermal
C. Ageostrophic
List II
P. vertical shear of the geostrophic wind
Q. two-force balanced flow
R. departure from balance
Select the correct match.
Answer: A
The geostrophic wind is the two-force balanced flow, the thermal wind is the vertical shear of that flow implied by a horizontal temperature gradient, and the ageostrophic wind is the departure of the actual wind from balance. The three together give a complete description of the horizontal wind at synoptic scales, with the small third member carrying the vertical motion and the evolution.
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