HR: 11:50h
AN: A52D-06    [Abstracts]
TI: Combing OMI and MLS to Improve Tropospheric Ozone Retrievals for Air Quality Applications
AU: * Liu, X
EM: xliu@umbc.edu
AF: Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore County, 5523 Research Park Drive, Baltimore, MD 21228, United States
AU: * Liu, X
EM: xliu@umbc.edu
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
AU: Bhartia, P K
EM: Pawan.K.Bhartia@nasa.gov
AF: NASA Goddard Space Flight Center, Code 613.3, 8800 Greenbelt Road, Greenbelt, MD 20771, United States
AU: Chance, K
EM: kchance@cfa.harvard.edu
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
AU: Kurosu, T P
EM: tkurosu@cfa.harvard.edu
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
AU: Spurr, R J
EM: rtsolutions@verizon.net
AF: RT Solution Inc., 9 Channing Street, Cambridge, MA 02138, United States
AB: OMI and MLS, both measuring ozone profiles, are two of the four instruments on board the EOS AURA satellite. MLS measures ozone profiles at a vertical resolution of about 3 km from 0.1 mb to 200 mb but with a limited spatial coverage. OMI measures ozone profiles from the stratosphere to the troposphere at very high spatial resolution but with a much coarser vertical resolution especially in the troposphere. So combing MLS and OMI data can improve the separation of stratospheric ozone from tropospheric ozone. In this study, we first use zonal MLS data combined with climatological ozone profiles in the troposphere to correct for across-track dependent biases (-2%-5%) in OMI level 1b radiance. We then use MLS data as a priori information in the stratosphere to retrieve ozone profiles from corrected OMI radiances using the optimal estimation technique. The combined retrievals are compared MLS retrievals and OMI retrievals that do not use MLS information. The inclusion of MLS data in OMI retrievals reduces the uncertainty in both stratospheric column ozone and tropospheric column ozone compared to using either instrument alone and improves the identification of tropospheric ozone due to pollution.
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting