Global distribution and climate forcing of carbonaceous aerosols

The global distribution of carbonaceous aerosols is simulated online in the Goddard Institute for Space Studies General Circulation Model II‐prime (GISS GCM II‐prime). Prognostic tracers include black carbon (BC), primary organic aerosol (POA), five groups of biogenic volatile organic compounds (BVOCs), and 14 semivolatile products of BVOC oxidation by O 3 , OH, and NO 3 , which condense to form secondary organic aerosols (SOA) based on an equilibrium partitioning model and experimental observations. Estimated global burdens of BC, organic carbon (OC), and SOA are 0.22, 1.2, and 0.19 Tg with lifetimes of 6.4, 5.3, and 6.2 days, respectively. The predicted global production of SOA is 11.2 Tg yr −1 , with 91%…