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摘要: Abstract. We used the nested grid version of global three-dimensional Goddard Earth Observing System chemical transport model (GEOS-Chem) to examine interannual variations (IAVs) aerosols over heavily polluted regions in China for years 2004–2012. The role meteorological parameters was quantified by a simulation with fixed anthropogenic emissions at year 2006 levels and changes Simulated PM2.5 (particles diameter 2.5 μm or less) aerosol concentrations exhibited large IAVs North (NC; 32–42° N, 110–120° E), regionally averaged absolute percent departure from mean (APDM) values 17, 14, 11% December-January-February (DJF), March-April-May (MAM), June-July-August (JJA), September-October-November (SON), respectively. Over South (SC; 22–32° were found be largest JJA, regional APDM 14% JJA about 9% other seasons. Sichuan Basin (SCB; 27–33° 102–110° E) simulated have smallest among examined this work, 8–9% all All species (sulfate, nitrate, ammonium, black carbon, organic carbon) NC DJF, corresponding season. Process analyses performed identify key that determined different regions. While temperature specific humidity, which influenced gas-phase formation sulfate, jointly sulfate both DJF wind (or convergence wind) precipitation dominant factors influence SC SCB. humidity gas-to-aerosol partitioning, major led nitrate China. drive carbon aerosol. also compared alone those alone; fields dominate northern southern Considering are mainly associated natural variability climate system, driven important implications effectiveness short-term air quality control strategies