A better assessment of the overall impact of benzene and toluene on OH would require a more complete emission inventory of aromatics in the model. For example, using a comprehensive list of annual anthropogenic and biomass burning emissions, Taraborrelli et al. found that aromatics decrease model OH concentrations over the ocean by 2-5 %. However, the inclusion of our mean emission fluxes increased the amount of SOA that is formed from benzene and toluene by ~1 and 6.3 % in the Arctic, respectively. In the Southern Ocean, the increases in benzene and toluenederived SOA due to including oceanic emissions are 12.8 % and 139.8 % (Figure ). Note that the simulated background SOA mass concentrations in the Arctic are more than 25 times those in the Southern Ocean. The majority of benzene and toluene in the Arctic that forms SOA comes from terrestrial emissions, which dwarf the oceanic benzene and toluene emissions. As such, adding our mean and maximum calculated Arctic ocean emission flux to the CAM-Chem model increases SOA concentration by 0.1 and 1.2 % respectively. In contrast, over the pristine Southern Ocean, farther away from continental influence, the impact of oceanic benzene and toluene emission on SOA is far greater: our cruiseaverage fluxes increased total SOA mass concentration by 7.7 % and total organic (primary + secondary) aerosol by 6.7 % (Figure ). Therefore, ocean biological emissions of benzene and toluene probably contribute to the observed summertime increase in total organic aerosol and SOA over the Southern Ocean . In comparison, Arnold et al. estimated that ocean isoprene emissions contribute only 0.2 to 1.3 % to SOA and organic aerosol mass concentrations over the Southern Ocean. Thus, marine benzene and toluene can be more important SOA (and, by extension, organic aerosol) precursors than marine isoprene, at least in the Southern Ocean. Running the model with the cruise-maximum Southern Ocean fluxes instead of the cruise-mean emission fluxes, the mass concentration of benzene and toluene derived SOA increased by 298.0 and 748.2 %, respectively (Figure ). This results in an increase in total SOA of 77.3 % and an increase of the total organic aerosol by 67.4 % and indicates that episodes of high ocean emissions of benzene and toluene may have a large local impact on SOA.