USGCRP
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Updated
12 October, 2003 |
US National Assessment of
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Simulations used for the U.S. National Assessment1. CGCM1Canadian Centre for Climate Modelling and Analysis (CCCma): First generation Coupled General Circulation Model (CGCM1) Simulations:
Optional additional scenarios for the National Assessment (1 run each).
2. HADCM2United Kingdom Meteorological Office/ Hadley Centre for Climate Prediction and Research: HADCM2 Simulations:
time series: 1860, scenarios start 1990 3. ECHAM4/OPYC3
4. NCAR
CSM (Climate System Model)
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CGCM1 | HADCM2 | ECHAM4/OPYC3 | GFDL | NCAR CSM | DOE PCM | HADCM3 | |
Atmosphere | 3.75o x 3.75o/10 T32 |
2.5o x 3.75o/19 grid |
2.8o x 2.8o/19 T42 |
3.75o x 2.25o/14 R30 |
2.8o x 2.8o/18 T42 | 2.8o x 2.8o/18 T42 | 2.5o x 3.75o/19 grid |
Land | modified bucket | canopy processes and stomatal resistance included | canopy processes and stomatal resistance included | bucket | canopy processes and stomatal resistance included | canopy processes and stomatal resistance included | canopy processes, stomatal resistance, and CO2 processes included (MOSES) |
Ocean | 1.8o x 1.8o
/29 Based on GFDL MOM 1.1 |
2.5o x 3.75o/20 | 2.8o x 2.8o/9 | 1.875o x 2.25o /18 GFDL MOM 1.1 |
2.4o x 1.2o(VAR)/45 | 0.66o x 0.66o (VAR)/32 | 1.25o x 1.25o/20 |
Sea Ice | Thermodynamic only | Dynamic and Thermodynamic | Dynamic and Thermodynamic | Dynamic and Thermodynamic | Dynamic and Thermodynamic | Dynamic and Thermodynamic | Dynamic and Thermodynamic |
Coupler | flux-adjusted | flux-adjusted | flux-adjusted | flux-adjusted | not flux-adjusted | not flux-adjusted | not flux-adjusted |
Multiple Greenhouse Gases | no | no | no | no | yes | yes | yes |
Sulfate Chemistry Model | no | no | no | no | yes | no | yes |
*Sensitivity | 3.5o C | 2.6o C | 2.6o C | 3.4o C | 2.0o C | 2.0o C | 3.3o C |
* sensitivity is based on 2xCO2 equilibrium experiments
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Emission Scenarios
For a complete description of the NCAR CSM forcing scenarios, go to NCAR CSM. Note: The CGCM1 experiments used the same forcing as the HADCM2 experiments (for the 1% case). ReferencesHoughton, J. T., Filho, L. G. M., Griggs, D. J., and K. Maskell, Eds., 1997, An introduction to simple climate models used in the IPCC second assessment report, IPCC,47 pp. Langner, J. and H. Rodhe, 1991, "A global three-dimensional model of the tropospheric sulfur cycle", J. Atmos. Chem., 13, 225-263. Mitchell, J. F. B. and T. C. Johns, 1997, "On modification of global warming by sulfate aerosols", J. Climate, 10(2): 245-267. Shine, K.
P. , Derwent, R. G., Wuebbles, D. J., and J. J. Morcrette, 1990, "Radiative
forcing of climate", Climate Change. The IPCC Scientific
Assessment, J. T. Houghton, G. J. Jenkins, and J. J. Ephraums, Eds.,
Cambridge University Press, 41-68. |
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