HR: 12:05h
AN: SA32A-08    [Abstracts]
TI: Extended CMAM: Impacts of thermospheric neutral and ion chemistry on the middle atmosphere.
AU: * Beagley, S
EM: beagley@nimbus.yorku.ca
AF: centre of Earth and Space Science, York University 4700 Keele Street, Toronto, ON M3J 1P3, Canada
AU: McConnell, J C
EM: jcmcc@yorku.ca
AF: centre of Earth and Space Science, York University 4700 Keele Street, Toronto, ON M3J 1P3, Canada
AU: Fomichev, V
EM: victor@nimbus.yorku.ca
AF: centre of Earth and Space Science, York University 4700 Keele Street, Toronto, ON M3J 1P3, Canada
AU: Semeniuk, K
EM: kirill@nimbus.yorku.ca
AF: centre of Earth and Space Science, York University 4700 Keele Street, Toronto, ON M3J 1P3, Canada
AU: Jonsson, A I
EM: andreas@atmosp.physics.utoronto.ca
AF: University of Toronto, University of Toronto 60 St. George Street, Toronto, ON M5S 1A7, Canada
AU: Garcia Munoz, A
EM: antonio.garcia-munoz@anu.edu.au
AF: Australian National University, Canberra, Canberra, ACT ACT 0200, Australia
AU: McLandress, C
EM: charles@mam.atmosp.physics.utoronto.ca
AF: University of Toronto, University of Toronto 60 St. George Street, Toronto, ON M5S 1A7, Canada
AU: Shepherd, T
EM: tgs@atmosp.physics.utoronto.ca
AF: University of Toronto, University of Toronto 60 St. George Street, Toronto, ON M5S 1A7, Canada
AB: The Canadian Middle Atmosphere Model (CMAM) is a chemistry-climate model with comprehensive gas phase and heterogeneous chemistry for middle atmosphere applications with a vertical domain from the surface to about 95 km. The extended version of CMAM has a vertical domain which encompasses the thermosphere and a nominal top at about 250 km, the exact height depending on solar cycle related EUV heating. Certain improvements have been reported in the dynamical version of extended CMAM (Fomichev et al., 2002). In this report we have added thermospheric gas phase and ion-molecule chemistry to study solar cycle effects of changing EUV solar flux and also auroral ionization (Semeniuk et al., 2007). The physical processes necessary to add have included molecular diffusion for minor and major species (N2, O2, and O) and we allow the model to internally derive its own mean-molecular mass and related parameters such as gas-constant in a consistent manner: 99% of the atmospheric gases are advected. The model has also includes improvements to the earlier extended dynamical CMAM version with changes to the GWD schemes. We have run an 8 year time-slice for assessment and the results will be presented here: current analysis indicates quite a good agreement with MSIS and satellite measurements. We will also present results to indicate the impact of a realistic thermosphere on the middle atmosphere as opposed to a CMAM version with a standard vertical domain at 95 km where boundary conditions are stipulated.
DE: 0342 Middle atmosphere: energy deposition (3334)
SC: SPA-Aeronomy [SA]
MN: 2007 Fall Meeting