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(a) DJF
90°N
750
45°N
Equator
750
45°S
750
600
600
600
600
90°S
0°
60°E
120°E
180°
120°W
60°W
0°
(b
) JJA
90°N
750
45°N
750
Equator
750
45°S
600
750
600
750
90°S
0°
60°E
120°E
180°
120°W
60°W
0°
(
c) DJF - JJA
90°N
-50
0
50
-50
45°N
-100
-50
100
0
Equator
0
-50
45°S
0
0
-100
-200
0
-50
-100
-200
90°S
0°
60°E
120°E
180°
120°W
60°W
0°
Figure 2.4 Geopotential height climatology at 900 hPa in meters for (a) December-
January-February (DJF),(b) June-July-August (JJA), and (c) their difference.
