HR: 1340h
AN: A53C-1342    [Abstracts]
TI: Revisiting "the Tropospheric Middle Eastern Ozone Maximum" With Satellite Observations of Tropospheric Ozone
AU: * Liu, J
EM: jliu@atmosp.physics.utoronto.ca
AF: Dept. of Physics, Univ. of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
AU: Jones, D B
EM: dbj@atmosp.physics.utoronto.ca
AF: Dept. of Physics, Univ. of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
AU: Worden, J R
EM: john.worden@jpl.nasa.gov
AF: Earth and Space Sciences Division, Jet Propulsion Laboratory, 4800 Oak Grove Drive, MS 183-617, Pasadena, CA 91109, United States
AU: Parrington, M
EM: markp@atmosp.physics.utoronto.ca
AF: Dept. of Physics, Univ. of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
AU: Kar, J
EM: jkar@atmosp.physics.utoronto.ca
AF: Dept. of Physics, Univ. of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
AB: Previous modelling and observational studies suggest the existence of a seasonal buildup in tropospheric ozone over the Middle East (Li et al. 2001 and Kar et al. 2002, Geophysical Research Letters). It has been suggested that this Middles Eastern ozone maximum is due to large-scale subsidence of ozone that is originally generated in the outflow of the Asian summer monsoon and transported to the Middle East by strong upper tropospheric jets. We present a detailed analysis of the seasonal cycle of ozone over the Middle East region, using recent observations from the Tropospheric Emission Spectrometer (TES) on the NASA EOS Aura satellite and the GEOS-Chem chemical transport model, to isolate the influence of photochemical production and transport on the ozone budget in the region. In general, in response to the Asian monsoon heating in the middle and upper troposphere, there is widespread descent across North Africa, the Middle East and Central Asia, and the observed seasonal accumulation of ozone reflects the influence of these centers of descent. The TES data show enhanced ozone extending from North Africa to Central Asia, while the modeled ozone abundance is at a maximum over the Middle East, reflecting possible biases in the model transport over North Africa and the Middle East.
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting