Aviation and the Global Atmosphere

Aviation and the Global Atmosphere
Aviation and the Global Atmosphere
{Title}
{Image_Here}
Other reports in this collection
Figure 2-1: Net ozone production (24-hr average) as a function of NO x in the upper troposphere (adapted from
Jaeglé et al., 1998). During the NASA-sponsored SUCCESS campaign (April-May 1996), simultaneous
measurements of HO 2 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 HO x is the reaction of O1D with H 2 O and CH 4 . 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 HO x production. These non-traditional HO x sources dramatically increase the ozone production rate in
the dry (