Figure 3-25: Annually and zonally averaged perturbation
of sulfate aerosol surface area density (in �m2 cm-3) caused by an HSCT fleet
of 500 aircraft flying at Mach 2.4 according to AER 2-D model (Weisenstein
et al., 1997). A sulfur emission index of 0.2 g kg-1 and a 10% conversion
to sulfate particles with 10-nm radius in the plume are assumed in these calculations.