Comparison of Tropospheric Ozone Columns Calculated from MLS, OMI, and Ozonesonde Data

Gary A. Morris, Valparaiso University
Bojan Bojkov, GEST- University of Maryland Baltimore County
Mark R. Schoeberl, NASA GSFC
Amy Wozniak, SAIC, NASA GSFC
Jerry Ziemke, GEST - University of Maryland Baltimore County
Sushil Chandra, GEST - University of Maryland Baltimore County
Jack Fishman, NASA Langley Research Center
Ivanka Stajner, NASA GSFC


This poster shows a comparison of three derived tropospheric ozone residual (TOR) products with integrated tropospheric ozone columns from ozonesonde profile: (1) the method of Ziemke et al. (2006), (2) a modified version of Fishman et al. (2003), and (3) a trajectory mapping approach. In each case, MLS ozone profiles are integrated to the tropopause and subtracted from OMI (TOMS retrieval) total column ozone. The effectiveness of each of these techniques is examined as a function of latitude, time, and geographic region. In general, we find good agreement between the derived products and the ozonesondes, with the Fishman et al. TOR (labeled “Amy”) generally high and the Schoeberl trajectory mapping (labeled “Mark”) product generally low as compared to the integrated ozonesonde profiles (labeled “Sonde”) as computed using the WMO tropopause definition. Differences in TOR results are due, at least in part, to non-uniform tropopause height definitions between the three approaches.