HR: 11:05h
AN: A12B-04    [Abstracts]
TI: AIRS CO2 in the Upper Troposphere
AU: * Jiang, X
EM: xun.jiang@jpl.nasa.gov
AF: Science Division, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, 91109,
AU: Chahine, M T
EM: Moustafa.T.Chahine@jpl.nasa.gov
AF: Science Division, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, 91109,
AU: Li, Q
EM: Qinbin.Li@jpl.nasa.gov
AF: Science Division, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, 91109,
AU: Olsen, E T
EM: Edward.T.Olsen@jpl.nasa.gov
AF: Science Division, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, 91109,
AU: Chen, L L
EM: luke.L.chen@jpl.nasa.gov
AF: Science Division, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, 91109,
AU: Yung, Y L
EM: yly@gps.caltech.edu
AF: Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd, Pasadena, 91125,
AB: Atmospheric Infrared Sounder (AIRS) retrieved CO2 and O3 by the Vanishing Partial Derivative (VPD) method [Chahine et al., 2005] have been validated with aircraft and ozonesonde data in April 2003. The latitudinal distributions of AIRS CO2 and O3 are consistent with in situ observations as well as results from two- and three- dimensional (2-D and 3-D) chemistry and transport models (CTMs). Following a stratospheric major final warming event, AIRS CO2 increases while O3 decreases in the polar upper troposphere. The seasonal cycle of AIRS CO2 matches that from aircraft data. Model results have smaller seasonal cycle amplitudes in the southern hemisphere compared with those in the northern hemisphere, which are consistent with the aircraft data. Some discrepancies are evident between the model and aircraft data in the mid-latitudes, where models tend to underestimate the amplitude of CO2 seasonal cycle. Sensitivity studies reveal that the convection mass flux is very crucial for the accurate simulation of upper tropospheric CO2. We are also exploring the use of AIRS CO2 to constrain the vertical transport in 3-D CTMs.
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0490 Trace gases
DE: 3362 Stratosphere/troposphere interactions
DE: 4806 Carbon cycling (0428)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting