15% 1. ABSTRACT We show results from joint TES-OMI retrievals for May, 2006. We combine TES and OMI data by linear updates from the spectral residuals.

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15% 1. ABSTRACT We show results from joint TES-OMI retrievals for May, We combine TES and OMI data by linear updates from the spectral residuals. Combined retrievals from the UV and IR spectral ranges have previously been shown to result in increased tropospheric sensitivity and resolution, and of particular interest, increased sensitivity to the planetary boundary layer. Results are compared to the OMI and TES results, and to near by sondes. METHOD INTRODUCTION * Worden et al., 2007 (above) shows that combined UV/IR retrievals will result in increased sensitivity especially at the planetary boundary layer * We now combine OMI & TES data using optimal averaging and linear updates * The end goal is a non-linear joint retrieval of TES & OMI ozone OMI and TES ozone OPTIMALLY COMBINING OZONE FROM TROPOSPHERIC EMISSION SPECTROMETER (TES) AND OZONE MONITORING INSTRUMENT (OMI) DATA Susan S. Kulawik 1, Xiong Liu 2,3, John R. Worden 1, Kelly Chance 3, Kevin Bowman 1, and the TES team 1 1 Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove, Pasadna, CA 91109, 2 Goddard Earth Sciences and Technology Center (GEST), University of Maryland, Baltimore County, Baltimore, Maryland (5523 Research Park Drive), 3 Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (60 Garden Street) TES website: Worden et al. (2007) showed that simulated joint retrievals from TES and OMI results in enhanced boundary-layer sensitivity Combining “real” data must account for biases and other systematic errors, such as calibration, spectroscopic, aerosol and cloud errors or inconsistencies OMI profile retrieval - TES shows a bias, with TES high relative to OMI DATA – OMI, TES AND CORROBORATIVE 5/3/2006 Aura nadir ground track crosses over or near: * Los Angeles (34N, 118W) * Trinidad Head sonde station (41N, 124.1W) * Mt. Bachelor Oregon (44N, 121.7W) * Cheeka Peak observatory (48.3N, 124.6W) MODIS images show cloud-free land scenes from California through Canada for this day TES CO shows elevated CO particularly from N. SENSITIVITY Curtain plots of the diagonal of the averaging kernel show sensitivity along the May 3, 2006 Aura ground track. OMI (top) and TES (middle) display different sensitivity. The combined retrieval (bottom) shows the greatest sensitivity. The tropospheric degrees of freedom increases from about 2.0 for OMI, 2.7 for TES to 3.7 total. Of particular interest is near the planetary boundary layer. SIMULATED RESULTS OF COMBINED RETRIEVALS LEFT Simulated results show improvement in the combined retrieval (red) compared to the sonde. RIGHT When a 10% bias is introduced between TES and OMI, the combined result tends to jackknife Trinidad Head sonde provides a good check of results in conjunction with surface ozone sites. The application of the joint averaging kernel “smooths” the sonde to what TES+OMI would see (Worden et al., 2007) The combined retrieval, using Equation 6 compares to the sonde; however TES and OMI already compared well to the sonde. The jackknifing of the combined results indicates remaining biases between OMI and TES. OMI and TES results are shown for May 3, The combined results from the residuals using Equation 6 with a 5% global bias assumed between TES and OMI. CONCLUSIONS  Optimally combined OMI & TES ozone results in increased sensitivity and resolution  In the troposphere, combined retrievals have 3.7 degrees of freedom, a significant increase over 2.0 and 2.7 for OMI and TES, respectively  Biases between OMI and TES retrievals need to be carefully characterized and corrected before optimally combining Joint retrievals