Impact of geoengineering schemes on the terrestrial biosphere
G. Bala, S. Thompson, P. Duffy, K. Caldeira, & C. Delire
Future implementation of large scale "geoengineering" has often been suggested as a way to combat the impact that unusually high CO2 concentrations will have on our climate. Here, the negative effects that geoengineering could have on the terrestrial biosphere are investigated.
Climate stabilization via ‘‘Geoengineering’’ schemes seek to mitigate climate change due to increased greenhouse gases by compensating reduction in solar radiation incident on earth’s surface. In this paper, we address the impact of these climate stabilization schemes on terrestrial biosphere using equilibrium simulations from a coupled atmosphereterrestrial biosphere model. Climate stabilization would tend to limit changes in vegetation distribution brought on by climate change, but would not prevent CO2 induced changes in Net Primary Productivity (NPP) or biomass; indeed, if CO2 fertilization is significant, then a climate-stabilized world could have higher NPP than our current world. Nevertheless, there are many reasons why geoengineering is not a preferred option for climate stabilization.