A secondary organic aerosol formation model considering successive oxidation aging and kinetic condensation of organic compounds: global scale implications

摘要: Abstract. The widely used two-product secondary organic aerosol (SOA) formation model has been extended in this study to consider the volatility changes of gases (SOG) arising from aging process as well kinetic condensation low volatile SOG (LV-SOG). In addition semi-volatile (SV-SOG) with saturation vapor pressure at 290 K ( C * ) range ~3 ppt–3 ppb and medium-volatile (MV-SOG) ~0.3–300 ppb, we add a third component representing LV-SOG below ppt design scheme transfer MV-SOG SV-SOG associated oxidation aging. This SOA implemented global (GEOS-Chem) co-condensation H 2 SO 4 on pre-existing particles is explicitly simulated. We show that, over many parts continents, concentrations are generally factor ~2–20 higher than those significantly enhances particle growth rates. Comparisons simulated observed evolution size distributions boreal forest site (Hyytiala, Finland) clearly that critical order bring simulations closer observations. With new scheme, annual mean mass increases by 2–10 boundary layer reaches above 0.5 μg m −3 most main improving agreement spectrometer (AMS) measurements. While decreases concentration nuclei larger 10 nm 3–30% lower result enhanced surface area reduced nucleation rates, it substantially cloud water supersaturation ratio 0.2%, ranging ~5–20% large fraction oceans high latitude continents more 50% some South America, Australia, Indonesia. Our highlights importance for models account SOGs their contribution growth.