Why are there large differences between models in global budgets of tropospheric ozone

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Transport impacts on atmosphere and climate: Aviation (2009, unknown): “Wu et al.”
Global health and economic impacts of future ozone pollution (2009, methodology): “Climate changes are simulated by the NASA/GISS GCM 3 (Rind et al 2007) and are used to drive GEOS-Chem as described by Wu et al (2007).”
Optimized regional and interannual variability of lightning in a global chemical transport model constrained by LIS/OTD satellite data (2012, unknown): “Hamid et al. [2001] noted that lightning frequencies in the tropics are very sensitive to small increases in surface air temperature [ Williams , 1992] and that the surface temperature over the tropical land generally increases during the positive phase of ENSO [ Hansen and Lebedeff , 1987].”
Surface ozone-temperature relationships in the eastern US: A monthly climatology for evaluating chemistry-climate models (2011, background): “…chemistry likely contributes; surface O3 over the eastern US is highly sensitive to the treatment of isoprene nitrate (RONO2) chemistry and whether isoprene nitrates represent a terminal or interim sink for NOx (Fiore et al., 2005; Horowitz et al., 2007; Ito et al., 2009; Wu et al., 2007).”
Remote sensed and in situ constraints on processes affecting tropical tropospheric ozone (2006, background): “Cloud optical depths are smaller in GEOS-4 than GEOS-3 leading to more active photochemistry (Liu et al., 2006; Wu et al., 2007).”