We tested the hypothesis that the effect of the role of CO_2 change and soil moisture availability on terrestrial net primary productivity (NPP) is interactively linked for all the GCM based vegetation types globally. A 1D atmospheric model dynamically coupled with a prognostic soil moisture / soil temperature scheme with a photosynthesis based vegetation / stomatal resistance submodel was used in this study. The objective was to analyze the effects of CO_2 doubling, under high as well as limiting soil moisture conditions, over different terrestrial biomes. Results for all the nine global biomes, as defined through the SiB2 land cover classification, were analyzed for responses such as evapotranspiration, NPP or net carbon assimilation, stomatal resistance, and air temperature.
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