1. Tropospheric Ozone Residual from OMI and MLS J. R. Ziemke, S. Chandra, B. N. Duncan, L. Froidevaux, P. K. Bhartia, P. F. Levelt, and J. Waters (J. Geophys. Res., 2006) 1 NASA Goddard Space Flight Center, Greenbelt, MD, USA 2 Jet Propulsion Laboratory, Pasadena, CA, USA 3 Royal Netherlands Meteorological Institute, De Bilt, Netherlands (OMI Science Team Meeting, UMBC; June 5-8, 2007)

2. OMI/MLS Algorithm Includes OMI cloud screening of total ozone (i.e., reflectivity < 0.3) Requires filling in MLS stratospheric ozone measurements between orbital gaps – i.e., interpolation, trajectory, assimilation, PV- mapping, etc. > 2D Gaussian/linear interpolation [Ziemke, et. al., JGR, 2006] > Trajectory [Schoeberl, et al., JGR, 2007] > Assimilation [Stajner, et al., JGR, 2007] > PV-mapping [Yang, et al., JGR, 2007] Uses MLS ozone profile data from 0.46 hPa to 316 hPa (the recommended range is 0.46-215 hPa) (OMI Science Team Meeting, UMBC; June 5-8, 2007)

3. Current OMI/MLS Tropospheric Ozone Residual Science Data Products (1) High-resolution monthly means and (2) daily along-track measurements Both tropospheric column ozone (DU) and mean volume mixing ratio (ppbv) Standard GRIDTOMS ASCII format (1 o × 1.25 o ) for all data files Data and images: NASA Goddard Code 613.3 tropospheric ozone webpage: http://hyperion.gsfc.nasa.gov/Data_services/cloud_slice/ MONTHLY DAILY (OMI Science Team Meeting, UMBC; June 5-8, 2007)

4. Validation of tropospheric ozone from OMI/MLS: Ozonesonde comparisons from SHADOZ and WOUDC (Ziemke, J. R., S. Chandra, B. N. Duncan, L. Froidevaux, P. K. Bhartia, P. F. Levelt, and J. Waters, JGR, 2006)

5. OMI/MLS Tropospheric Ozone: U.S. (0.25 o × 0.25 o )

6. OMI/MLS Tropospheric Ozone: Europe and Eastern Asia (0.25 o × 0.25 o )

7. OMI/MLS Tropospheric Ozone: S. America and Southern Africa (0.25 o × 0.25 o )

8. New Science Results and Objectives for Tropospheric Ozone (from 2D Interpolation Method) Model comparisons El Nino and La Nina events Intra-seasonal variability including the Madden-Julian Oscillation Photochemical/dynamical relationships with CO, NO 2, H 2 O, etc. Cloud physics and chemistry

9. Comparison with the COMBO-CTM (Ziemke, J. R., S. Chandra, B. N. Duncan, L. Froidevaux, P. K. Bhartia, P. F. Levelt, and J. Waters, JGR, 2006)

10. Comparison with the COMBO-CTM (Ziemke, J. R., S. Chandra, B. N. Duncan, L. Froidevaux, P. K. Bhartia, P. F. Levelt, and J. Waters, JGR, 2006)

11. Comparison with the COMBO-CTM (Ziemke, J. R., S. Chandra, B. N. Duncan, L. Froidevaux, P. K. Bhartia, P. F. Levelt, and J. Waters, JGR, 2006)

12. What is El Nino? 1. Occurs when SST in NINO 3.4 region (120 o -170 o W, 5 o S-5 o N) is > 0.5 o C above normal for several consecutive months 2. Causes shift in tropical convection from western Pacific to eastern Pacific 3. Generally opposite conditions exist during La Nina

13. Effects on Tropospheric O 3 (left) and H 2 O (right) from El Nino (Chandra, S., et al., Geophys. Res. Lett., 2007)

14. What is the Madden-Julian Oscillation (MJO)? 1. ~40-50 day oscillation in tropospheric winds, temperature, and pressure in the tropics 2. Associated with large-scale circulation/convection in the tropical troposphere 3. Originates primarily in the equatorial Indian Ocean and extends to at least the central Pacific

15. Low-pass filtered (20-day) Tropospheric Ozone Mean Volume Mixing Ratio (left) and 215 hPa H2O Volume Mixing Ratio (right) (Ziemke, J. R., et al., GRL, manuscript in preparation)

16. Conclusions Tropospheric ozone science data products (both column and mean volume mixing ratio) from OMI/MLS are currently available (monthly mean high resolution and daily along-track) from TOMS web page Standard data products of OMI/MLS tropospheric ozone are under consideration Some science and validation done and published including model comparisons, but there is much yet to do

17. Tropospheric Ozone Mean Volume Mixing Ratio Tropospheric Column Ozone (DU) VMR (ppmv) = 1.27 × ———————————————— P SURFACE (hPa) – P TROPOPAUSE (hPa) VMR is used to account for variations in tropospheric ozone associated with surface pressure and tropopause pressure.