P7.7
Measured and modeled HOCl profiles in the mid-latitude stratosphere: implications for ozone loss
Laurie Kovalenko, JPL, Pasadena, CA; and R. J. Salawitch, L. Froidevaux, J. F. Blavier, A. Kleinboehl, N. J. Livesey, J. J. Margitan, R. A. Stachnik, G. Toon, J. W. Waters, K. Jucks, and D. Johnson
The HOCl catalytic cycle for ozone loss is important in the mid-latitude stratosphere. We use a diurnal steady-state photochemical model to calculate profiles of HOCl for conditions sampled by two high-altitude balloon-borne instruments, MkIV and FIRS-2. To assess how well this model represents ozone loss by the HOCl cycle, we compare our calculations of HOCl and its precursors, ClO and HO2, with balloon-borne measurements obtained by an FTIR solar absorption spectrometer (MkIV), a far-infrared emission spectrometer (FIRS-2), and a submillimeterwave limb sounder (SLS), and satellite-borne measurements obtained by a microwave limb sounder (MLS on Aura). We then evaluate these comparisons in light of a number of recent laboratory studies of the main formation mechanism of HOCl, the reaction of ClO + HO2. Comparisons between model and observations suggest better agreement might be achieved with a faster rate constant. Aura MLS retrievals of HOCl are discussed in the context of the balloon measurements and model results.
Poster Session 7, Stratospheric Chemistry and Ozone Recovery Posters
Thursday, 23 August 2007, 3:30 PM-5:30 PM, Holladay
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