Recent field studies reveal large formation of secondary organic aerosol (SOA) under urban polluted ambient conditions, while SOA formation in biomass burning smoke appears to be very variable. To study this formation, a Potential Aerosol Mass (PAM) photooxidation flow reactor was deployed with submicron aerosol size and chemical composition measurements during two studies: FLAME-3, a biomass-burning study at USDA Fire Sciences Laboratory in Missoula, MT and CalNex-LA in Pasadena, CA. A high-resolution time-of-flight aerosol mass spectrometer and a scanning mobility particle sizer alternated sampling unprocessed and PAM-processed aerosol. Results show promise for the use of PAM as a tool for in-situ evaluation of changes in OA concentration and composition due to SOA formation and POA oxidation. In FLAME-3, net SOA formation and OA aging were variable among smokes from different biomasses. Results from CalNex-LA show formation and enhancement of SOA and inorganic aerosol during certain periods of the campaign.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)