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Recent studies have shown that low volatility gas-phase species can be lostonto the smog chamber wall surfaces. Although this loss of organic vapors towalls could be substantial during experiments, its effect on secondaryorganic aerosol (SOA) formation has not been well characterized andquantified yet. Here the potential impact of chamber walls on the loss ofgaseous organic species and SOA formation has been explored using theGenerator for Explicit Chemistry and Kinetics of the Organics in theAtmosphere (GECKO-A) modeling tool, which explicitly represents SOA formationand gas–wall partitioning. The model was compared with 41 smog chamberexperiments of SOA formation under OH oxidation of alkane and alkene series(linear, cyclic and C12-branched alkanes and terminal, internal and 2-methylalkenes with 7 to 17 carbon atoms) under high NOx conditions. Simulatedtrends match observed trends within and between homologous series. The lossof organic vapors to the chamber walls is found to affect SOA yields as wellas the composition of the gas and the particle phases. Simulateddistributions of the species in various phases suggest that nitrates,hydroxynitrates and carbonylesters could substantially be lost onto walls.The extent of this process depends on the rate of gas–wall mass transfer,the vapor pressure of the species and the duration of the experiments. Thiswork suggests that SOA yields inferred from chamber experiments could beunderestimated up a factor of 2 due to the loss of organic vapors to chamberwalls

atmospheric chemistry and physics

Impact of chamber wall loss of gaseous organic compounds on secondary organic aerosol formation: explicit modeling of SOA formation from alkane and alkene oxidation