SEASONAL CHANGES OF SOIL MOISTURE INDUCED BY INCREASED CO2 AS SIMULATED BY THE ATMOSPHERIC GENERAL CIRCULATION AND MIXED LAYER OCEAN MODEL

The atmospheric general circulation model coupled to the mixed layer ocean model has been used to simulate the changes of the global soil moisture.Comparing the simulated results with observations,it is shown that the model is capable of doing sensitive experiments about the carbon dioxide change.The 2×CO2/1×CO2 comparison shows that there are the obvious changes of the soil moisture in the global for four seasons.There are the wet soil moisture in the lower latitudes of both hemispheres and dry soil moisture in the middle latitudes of both hemispheres for four seasons.The dry soil moisture in summer and wet in other seasons are foundin the northern higher latitudes.The analyses of the physical feedbacks responsible for the CO2-induced changes of soil moisture show that the budgets of the surface water and heat are the important factors.