Aviation and the Global Atmosphere

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Figure 2-1: Net ozone production (24-hr average) as a function of NOx in the upper troposphere (adapted from Jaeglé et al., 1998). During the NASA-sponsored SUCCESS campaign (April-May 1996), simultaneous measurements of HO2 and NO were obtained from the NASA DC-8 aircraft. These observations define the rate of ozone production via the chemistry outlined in Section 2.1.2.1. Also shown in this figure are three calculations for average tropospheric conditions experienced above 11 km during SUCCESS. Case 0 illustrates the production rate expected if the only primary source of HOx is the reaction of O1D with H2O and CH4. Case 1 is the rate calculated by assuming acetone is present at 510 ppbv, consistent with recent airborne measurements (Singh et al., 1995; Arnold et al., 1997). Case 2 assumes that a convective source of peroxides and formaldehyde provides additional HOx production. These non-traditional HOx sources dramatically increase the ozone production rate in the dry (<100 ppmv H2O) upper troposphere.

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