HR: 09:15h
AN: A11E-05    [Abstracts]
TI: The Response to Solar Cycle Forcing in he Fully Coupled Chemistry-Climate GISS ModelE
AU: * Shindell, D
EM: dshindell@giss.nasa.gov
AF: NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025 United States
AU: Faluvegi, G
EM: gfaluvegi@giss.nasa.gov
AF: NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025 United States
AU: Schmidt, G
EM: gschmidt@giss.nasa.gov
AF: NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025 United States
AB: 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). The flexible architecture of modelE 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 atmospheric response to solar cycle variations with both a slab ocean and fixed SSTs, and with and without chemistry. We will present a comparison of the four sets of experiments with observations, including the poleward and downward propagation of zonal wind anomalies, which is substantially improved over our previous simulations. One of the most interesting features of the response is that in addition to displaying the typical ozone increase between solar minimum and maximum centered around 3 hPa, the model is also able to capture the secondary layer of ozone increases in the lowermost tropical stratosphere. We will discuss the relative contribution of chemistry and transport to this feature, and it's impact on dynamics via changing the meridional temperature gradient in the tropopause region.
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 1610 Atmosphere (0315, 0325)
DE: 1620 Climate dynamics (3309)
DE: 1650 Solar variability
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting