Fig. 13.

Globally integrated ozone response [DU] relative to aircraft NO_x emissions (Tg N yr⁻¹) for a number of model simulations (A) and, the ozone production efficiency (OPE, the number of ozone molecules produced per emitted NO_x molecule) (B). Data from the AEROCHEM2 project (Berntsen et al., 2003), the TRADEOFF project (Sausen et al., 2005, Stordal et al., 2006, Gauss et al., 2006), the QUANTIFY project (Hoor et al., 2009); E39/C model runs (Grewe et al., 2002b, Grewe, 2007), the GMI project (Rodriguez et al., 2003), OsloCTM2 runs (Isaksen et al., 2001, Gauss et al., 2006). Since individual tropospheric ozone lifetimes were not available, this was assumed to be 28 days for all models (see discussion in text).