Stratospheric Control of Climate

Firm evidence for a connection between variations in solar radiation and climate has been elusive. In his Perspective, Robock discusses the results of Haigh, who reports in this same issue (p. 981) new computer simulations of solar-climate interaction. The computer model produces a realistic tropospheric response to solar variation, in part because the simulation takes into account the stratospheric changes in ozone caused by the sun, which in turn influence the troposphere.