HR: 0800h
AN: A51D-0733    [Abstracts]
TI: Comparison of CMAM Simulations of Carbon Monoxide (CO), Nitrous Oxygen (N2O), and Methane (CH4) With Observations From Odin/SMR, ACE-FTS, and AURA MLS
AU: Jin, J J
EM: jin@nimbus.yorku.ca
AF: Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, ON M3J 1P2, Canada
AU: Semeniuk, K
EM: kirill@nimbus.yorku.ca
AF: Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, ON M3J 1P2, Canada
AU: Beagley, S R
EM: beagley@nimbus.yorku.ca
AF: Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, ON M3J 1P2, Canada
AU: Jonsson, A I
EM: andreas@atmosp.physics.utoronto.ca
AF: Department of Physics,University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
AU: * McConnell, J C
EM: jack@nimbus.yorku.ca
AF: Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, ON M3J 1P2, Canada
AU: Urban, J
EM: jo.urban@rss.chalmers.se
AF: Department of Radio and Space Science, Hörsalsvägen 11, GÖTEBORG, SE - 412 9, Sweden
AU: Murtagh, D
EM: donal@rss.chalmers.se
AF: Department of Radio and Space Science, Hörsalsvägen 11, GÖTEBORG, SE - 412 9, Sweden
AU: Barret, B
EM: barp@aero.obs-mip.fr
AF: Laboratoire d'Aerologie/CNRS, 10 Avenue Edouard Belin, Toulouse, 31400, France
AU: Boone, C D
EM: cboone@acebox.uwaterloo.ca
AF: Department of Chemistry,University of Waterloo, 200 University Avenue West, Warerloo, ON N2L 3G1, Canada
AU: Dupuy, E
EM: ead583@mail.usask.ca
AF: Department of Chemistry,University of Waterloo, 200 University Avenue West, Warerloo, ON N2L 3G1, Canada
AU: Bernath, P F
EM: pfb500@york.ac.uk
AF: Department of Chemistry,University of Waterloo, 200 University Avenue West, Warerloo, ON N2L 3G1, Canada
AU: Bernath, P F
EM: pfb500@york.ac.uk
AF: Department of Chemistry, University of York, ?, Heslington, YO10 5DD, United Kingdom
AU: Walker, K A
EM: kwalker@atmosp.physics.utoronto.ca
AF: Department of Physics,University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
AB: Simulations of CO, N2O and CH4 from a coupled chemistry-climate model (CMAM) are compared with satellite measurements from ACE-FTS, Odin/SMR and AURA MLS. Pressure-latitude cross-sections and seasonal time series demonstrate that CMAM reproduces the observed global distributions and follow the polar evolutions seen in the CO, N2O, and CH4 measurements. Generally, excellent agreements are found in CO monthly zonal mean profiles in the stratosphere and mesosphere for various latitudes and seasons. The difference between the simulations and the observations are generally within 50%. Comparisons of N2O show that CMAM follows the measurements very well, usually within 15% of the relative difference, in the lower and middle stratosphere but has negative bias with factors as small as 0.1 in the upper stratosphere. The CMAM CH4 profiles also follow the observations as the N2O, but have negative biases in the upper stratosphere too. These negative biases are probably due to a transport problem from the lower stratosphere to the upper stratosphere. CO measurements from 2004 and 2006 by SMR and MLS show evidence of descent of air from the mesosphere into the stratosphere in the Arctic after strong stratospheric sudden warmings. CMAM also captures this feature. We will also show the "tape recorder" and the Quasi-Biennial Oscillation (QBO) signal from the SMR N2O observations. CMAM can produce the "tape recorder" signals with CO and N2O but cannot produce the QBO signals. Nevertheless, this study confirms that CMAM has an overall good capability to simulate middle atmospheric transport processes besides identifying its deficiencies.
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting