Discussion
Match each inversion in List I with its cause in List II.
List I
A. Radiation inversion
B. Subsidence inversion
C. Frontal inversion
D. Advection inversion
List II
1. Descending air in a high pressure system
2. Nocturnal cooling of the ground under a clear sky
3. Warm air moving over a colder surface
4. Warm air overrunning cold air at a front
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Each inversion takes its name from the process that creates it. A radiation inversion (A) comes from nocturnal cooling of the ground under a clear sky (2), which chills the air in contact with it. A subsidence inversion (B) comes from descending air in a high pressure system (1) warming as it is compressed.
A frontal inversion (C) forms where warm air overruns cold air at a front (4), the warm air riding above the denser cold wedge. An advection inversion (D) forms where warm air moves horizontally over a colder surface (3) - sea air crossing cold land, for instance - and is cooled from below.
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