A Comparison of Simulations of Current Climate from
Two Coupled Atmosphere-Ocean Global Climate Models
Against Observations and Evaluation of Their Future Climates

Ruth Doherty and Linda O. Mearns

Revised 27 April 1999

Note About Revision


Tables

Table 1: CGM configurations

Atmosphere Oceans
CGCMI
Spectral T32 Truncation
3.75° x 3.75° horizontal resolution
10 vertical levels
1.8° x 1.8° resolution

29 levels

HADCM2
Spherical
2.5° x 3.75° horizontal resolution
19 vertical levels
2.5° x 3.75° resolution

11 levels

Table 2: Increases in temperature over the US

2030
Winter
2030
Summer
2060
Winter
2060
Summer
2090
Winter
2090
Summer
CGCMI
2 - 4°C
west & central US,
0 - 2°C east US
1 - 3°C
over US
2 - 5°C
west US,
4 - 7°C central US,
1 - 5°C east US
2 - 4°C
over US
3 - 7°C
west US,
4 - 12°C central US,
3 - 7°C east US
3 - 7°C
over US
HADCM2
1 - 4°C
west & central US,
1 - 3°C east US
1 - 2°C
west US,
0 - 3°C central US,
0 - 1°C east US
1 - 3°C
west US
1 - 4°C central US,
2 - 4°C east US
2 - 3°C
west & east US
2 - 4°C central US
2 - 7°C
west & central US,
1 - 5°C east US
3 - 5°C
west US,
0 - 5°C central US,
1 - 3°C east US

Table 3a: Changes in precipitation over western US

2030
Winter
2030
Summer
2060
Winter
2060
Summer
2090
Winter
2090
Summer
CGCMI
0.0 to +3.0
mm/day
-0.5 to +0.5
mm/day
0.0 to +3.0
mm/day
-1.0 to +0.5
mm/day
+0.5 to +10.0
mm/day
-0.5 to +0.5
mm/day
HADCM2
0.0 to +2.0
mm/day
-0.5 to +1.0
mm/day
0.0 to +3.0
mm/day
-0.5 to +0.5
mm/day
0.0 to +10.0
mm/day
-0.5 to +0.5
mm/day

Table 3b: Changes in precipitation over central US

2030
Winter
2030
Summer
2060
Winter
2060
Summer
2090
Winter
2090
Summer
CGCMI
-2.0 to 0.0
mm/day
-1.0 to +0.5
mm/day
-1.0 to +0.5
mm/day
-2.0 to +0.5
mm/day
-2.0 to +0.5
mm/day
-3.0 to +0.5
mm/day
HADCM2
-0.5 to +1.0
mm/day
-0.5 to +1.0
mm/day
0.0 to +1.0
mm/day
-0.5 to +0.5
mm/day
-1.0 to +1.0
mm/day
-0.5 to +2.0
mm/day

Table 3c: Changes in precipitation over eastern US

2030
Winter
2030
Summer
2060
Winter
2060
Summer
2090
Winter
2090
Summer
CGCMI
-2.0 to 0.0
mm/day
-1.0 to +0.5
mm/day
-1.0 to+ 0.5
mm/day
-2.0 to+ 0.5
mm/day
-2.0 to +0.5
mm/day
-2.0 to +0.5
mm/day
HADCM2
0.0 to +1.0
mm/day
-0.5 to +1.0
mm/day
0.0 to +1.0
mm/day
-0.5 to +0.5
mm/day
0.0 to +2.0
mm/day
-0.5 to +2.0
mm/day


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