Geoscience Reference
In-Depth Information
Summer
mb
400
450
cT
('Superior Air')
500
550
600
mP
(Interior)
650
700
mP
(West
Coast)
750
mA
800
850
'cP'
mT
900
950
1000
Figure 9.5
The average vertical temperature structure for selected air masses affecting North America
in summer.
Sources: After Godson (1950), Showalter (1939) and Willett.
(A)
(B)
180°
0°
12
12
SOUTH
ATLANTIC
NORTH
PACIFIC
12
6
6
12
6
SOUTH
AFRICAN-
INDIAN
6
11
12
CENTRAL
EAST
ASIA
6
11
ARCTIC
11
ANTARCTIC
90°W
90°E
90°W
90°E
CENTRAL
ASIA
OHIO
VALLEY
GREENLAND
6
SOUTH
PACIFIC
6
6
SOUTH
AFRICAN-
INDIAN
6
6
12
6
TURKIC
6
6
NORTH
ATLANTIC
8
12
EAST
SAHARAN
6
12
6
12
0°
180°
Figure 9.6
Air-mass source regions in the Northern Hemisphere (A) and the Southern Hemisphere (B). Numbers
show the areas affected by each air mass in months per year.
Sources: After Wendland and Bryson (1981) and Wendland and McDonald (1986).
