HR: 08:23h
AN: SA51C-02 INVITED     [Abstracts]
TI: Middle Atmosphere Climate Changes From Transient Runs With the Canadian Middle Atmosphere Model
AU: * Fomichev, V I
EM: victor@nimbus.yorku.ca
AF: ESSE, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada
AU: Jonsson, A I
EM: andreas.jonsson@utoronto.ca
AF: Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
AB: The Canadian Middle Atmosphere Model (CMAM) is a general circulation model which extends from the surface up to about 95 km. It contains an interactive photochemical module and includes realistic parameterizations of the major physical processes necessary to represent the complexity of interactions throughout the model domain. The model has been run from 1960 to 2100 to investigate the atmospheric response to transient forcings in sea surface temperatures, CFCs and greenhouse gases, including CO2, CH4, and N2O. The major effect in the middle atmosphere is a cooling caused by the CO2 increase. This cooling is modulated by long-term changes in ozone concentrations: ozone depletion in the past leads to an additional cooling whereas ozone recovery in the future reduces the CO2 effect. The focus of this paper is on processes in the upper stratosphere and mesosphere. Results from the transient numerical experiments with the CMAM are discussed and comparison with available long-term observations of the recent past is shown.
DE: 0340 Middle atmosphere: composition and chemistry
DE: 1626 Global climate models (3337, 4928)
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly