Discussion
Match each type of inversion with how it forms.
List I
A. Radiation inversion
B. Subsidence inversion
C. Frontal inversion
D. Valley inversion
List II
1. warm air riding over colder air at a front
2. surface cooling on a clear calm night
3. cold dense air draining downhill at night
4. sinking air warming by compression aloft
Answer: C
Correct answer: A-2, B-4, C-1, D-3
Four routes to the same profile. A radiation inversion forms when the ground loses heat on a clear calm night and chills the air touching it. A subsidence inversion forms aloft where sinking air in a high-pressure system warms by compression. A frontal inversion occurs where warm air rides over colder air at a front. And a valley inversion forms when cold dense air drains downhill and pools in the bottom.
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