Present Day and Historical Response to Solar Forcing in the Fully Coupled Chemistry-Climate GISS ModelE

Drew Shindell [dshindell@giss.nasa.gov], Greg Faluvegi, Gavin Schmidt, and Elliot Aguilar, NASA Goddard Institute for Space Studies, New York, New York.

            We have incorporated fully interactive chemistry operating seamlessly from the surface through the stratopause into the new state-of-the-art GISS climate model (modelE/III). The flexible architecture of this model allows us to easily run the identical atmospheric model with or without chemistry, and coupled to either a fully dynamic ocean, a slab ocean or using prescribed sea surface temperatures (SSTs). We are using this model to examine the dependence of the atmospheric response to solar variations on chemistry and on the representation of the oceans. We will present a comparison of the solar cycle experiments with observations, including the poleward and downward propagation of zonal wind anomalies. We will discuss the relative contribution of chemistry and transport to ozone changes in the tropopause region, and their key role in altering dynamics via changing the meridional temperature gradient in that region. The response to long-term solar irradiance changes, and a comparison to historical climate anomalies, will also be presented, and we will show that the newer model is able to better capture historical patterns than our older simulations.