Tropospheric aerosol impacts on trace gas budgets through photolysis

摘要: [1] Aerosols affect the global budgets of O3, OH, and CH4 in part through their alteration photolysis rates direct chemical interactions with gases (i.e., “heterogeneous chemistry”). The first effect is evaluated here a tropospheric chemistry transport model using recently developed climatologies aerosols: satellite-derived aerosol climatology over oceans by advanced very high resolution radiometer model-generated for land plus Center Climate System Research. Globally averaged, impact aerosols on alone to increase O3 0.63 Dobson units 130 ppb (via OH decreases 8%). These greenhouse gas increases lead an indirect (counting both natural anthropogenic aerosols) +0.08 W/m2. Although are, course, global, changes are mainly regional, largest impacts northwest Africa January India southern July. influence greater July than Northern Hemisphere Southern Hemisphere, as expected given pollution sources Hemisphere. predominant due land; ocean contribute less third globally integrated changes.