10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Developing the SAPRC Gas-Phase Chemical Mechanism and Chamber-Based SOA Parameterizations for Evaluating Biomass-Burning Derived SOA from Furan and Furan Derivatives
JIA JIANG, William P. L. Carter, David R. Cocker III, Lindsay Hatch, Kelley Barsanti, University of California, Riverside
Abstract Number: 1579 Working Group: Aerosol Modeling
Abstract Biomass burning (BB) can release significant quantities of trace gases and particulate matter (PM) to the atmosphere, which will strongly influence climate and tropospheric air quality. Advances in analytical techniques have recently enabled improved identification and quantification of the gas-phase organic carbon emissions from BB. Efforts to quantify the potential secondary organic aerosol (SOA) formation from these recently identified compounds have been hindered due to the lack of published information on the reaction kinetics and mechanisms for atmospheric oxidation, as well as the lack of chamber-based SOA yields. Furan and its derivatives represent one significant class of compounds in BB emissions, for which the fate and potential role as SOA precursors remain largely unexplored.
Here we present recent developments in: 1) the SAPRC gas-phase chemical mechanism to treat the atmospheric oxidation of furan/furan derivatives; and 2) SOA parameterizations for furan/furan derivatives derived from existing chamber data. Prior to this study, the treatment of furan chemistry in SAPRC was highly condensed and parameterized, which made it less reliable for atmospheric predictions in BB-influenced regions. Reaction rates of furan/furan derivatives with atmospheric oxidants and subsequent product yields were updated based on published literature specific to furan/furan derivatives and structure-activity relationships; the mechanism, including recent updates, was designed to be applicable for both low and high NOx conditions. Smog chamber data from fifteen experiments with furan or its methyl derivatives were used to evaluate the SAPRC model with updated furan/furan derivative chemistry. Additionally, SOA parameterizations were derived by fitting measured SOA yields (wall-loss corrected) using a Volatility Basis Set (VBS) modeling approach. The updated gas phase and SOA modeling results will be presented. Together the updated SAPRC mechanism and chamber-based SOA parameterizations will allow predictions of the potential contribution of BB-derived furan and furan derivatives to SOA formation using chemical transport models. Future work will include additional chamber studies to investigate a wider range of furan derivatives and chemical conditions most relevant in fire-impacted regions. Modifications to the SOA parameterizations to better represent the range of formation processes will also be considered.