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Warm occlusion
Cold occlusion
B
D
L
L
Air mass
2
Air mass
2
A
C
Air mass 1
Air mass 1
Warm sector
air
Warm sector
air
Air mass 1:
Cold
Air mass 1:
Colder
Air mass 2:
Cold
Air mass 2:
Colder
A
BC
D
Warm sector
air
Warm sector
air
Air mass 1
Air mass 1:
More statically
stable
Air mass 2:
More statically
stable
Air
mass 2
A
BC
D
Figure 9.16 Schematic illustration of a cold and a warm occlusion in the classical model. Plan view of
synoptic pattern (above) and cross-sections along line A-B (center). Colder air is shaded darker. The bottom
panel illustrates proposed criteria for identifying warm and cold occlusions based on static stability.
Source: Above and center from Stoelinga et al., (2002, p. 710, Fig. 1). Courtesy of the American Meteorological Society. The
bottom panel is based on their new definition.
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