1 monitoring tropospheric ozone from ozone monitoring instrument (omi) xiong liu 1,2,3, pawan k....
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3 Introduction Backscattered Ultraviolet (BUV) technique [Singer&Wentworth, 1957]: Measure ozone profiles since the 1970s (BUV, SBUV, SBUV2) Provide little information below 25 km [Bhartia et al., 1996]. Tropospheric O 3 Column (TOC): total O 3 -strat. O 3 column (SOC) Poor spatiotemporal sampling (e.g., low vertical resolution of nadir sensors and poor horizontal sampling of limb sensors) or large uncertainty in SOC Most methods only derive monthly mean TOC in the tropics With advanced instrumentation (OMI/MLS on AURA) and techniques (e.g., PV/trajectory mapping, assimilation), possible to derive daily TOC globally [Yang et al., 2007, Schoeberl et al., 2007; Stajner et al., 2007] Tropospheric O 3 retrievals from hyper-spectral UV instruments (e.g., GOME, OMI) [Chance et al.,1997, Munro et al.,1998, Liu et al., 2005] Strong wavelength dependence of ozone absorption in the Hartley and Huggins bands coupled with wavelength-dependent Rayleigh scattering Temperature dependence in the Huggins bands ( nm) We developed an 8-year (July 1995-June 2003) dataset of GOME ozone profiles and are applying our algorithm to OMI data