A MODEL OF A COUPLED SEA-ATMOSPHERE-CLOUD CLIMATE SYSTEM^*

In this paper,a coupled sea-atmosphere-cloud climatic model is set up.Qualitative analysis shows that the system exists at least in five possible equilibrium states,and not four as traditionally considered.Numerical simulation stated that when we do not consider the feedback of clouds the SST will raise 0.96 K and 0.97 K respectively as the concentrations of CO2 rise from 280 ppm and 330 ppm to 560 ppm and 660 ppm.When we consider the feedback the SST rises only about 0.51 K under same conditions.So greenhouse effect of CO2 is lessened in certain extent.