The CAM-Chem simulations were conducted in specified dynamic mode (nudged to GEOS5 meteorological data) so that we can isolate the chemical impacts of the additional oceanic emissions of benzene and toluene on the atmospheric levels of benzene, toluene, oxidants (OH), and SOA. The simulations were run from Jan 2017 to Dec 2019 and the results in the first 6 months were discarded as spin-up. For the anthropogenic and biomass burning sources of air pollutants, including NOx, SO2, CO, NH3, VOCs (e.g. benzene, toluene and many others), we used the emission inventories compiled for the ongoing CMIP6 project . The terrestrial biological emissions of VOCs (e.g. isoprene, monoterpenes) are calculated online using MEGAN2 . It is worth mentioning that being a global chemistry-climate model, CAM-Chem includes the transport of terrestrial emissions of VOCs to the marine atmosphere. A climatology of oceanic emission of DMS, used in previous CESM simulations (e.g. Tilmes et al. and Veres et al. ( )), is also included, which is the only oceanic emission of reactive gas considered in this model.