We study the physicochemical evolution of organic aerosols from biomass burning. The evolution of BB POA and SOA signatures observed with the Aerodyne AMS are investigated, focusing on measurements in the Arctic, in comparison to data from other field and laboratory studies. f60 (m/z60 /organic mass) is used as a primary marker, and f44 as a tracer for SOA and aged POA. A novel graphical method characterizes aging of BB plumes, with similar trends in most field and lab studies. A statistically significant difference in f60 between highly-oxygenated OA of BB and non-BB origin is observed using this tracer, consistent with a substantial contribution of BBOA to the springtime 2008 Arctic aerosol burden. The net enhancement of OA with aging of BB plumes shows large variability. A global net OA source due to aging of BB plumes is estimated ∼9 Tg OA/yr, of ∼5% of global OA.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)