Important Roles and Formation of Atmospheric Organosulfates in Marine Organic Aerosols: Influence of Phytoplankton Emissions and Anthropogenic Pollutants

Organosulfates (OSs) could be potentially important compoundsinmarine organic aerosols, while their formation in marine atmospheresis far from clear due to a lack of cruise observations. In this work,shipboard atmospheric observations were conducted over the YellowSea and Bohai Sea to investigate the abundance and formation of biogenicisoprene/monoterpene-OSs in marine aerosols. The quantified OSs andNOSs accounted for 0.04-6.9% of marine organic aerosols andwere 0.07-2.2% of the non-sea-salt (nss) sulfate in terms ofsulfur content. Isoprene-related (nitrooxy-)OSs occupied 27-87%of the total quantified OSs, following the abundance order of summer> autumn > spring or winter. This order was driven by the marinephytoplanktonbiomass and sea surface temperature (SST), which controlled the seawaterand atmospheric isoprene concentration levels. Under the severe impactsof anthropogenic pollutants from the East Asia continent in winter,monoterpene nitrooxy-OSs, generated with NO (x) involved in, increased to 34.4 & PLUSMN; 35.5 ng/m(3) andcontributed 68% of the quantified (nitrooxy-)OSs. Our results highlightthe notable roles of biogenic OSs in marine organic aerosols overregions with high biological activity and high SST. The formationof biogenic OSs and their roles in altering marine aerosol propertiescalls for elaboration through cruise observations in different marineenvironments. Cruise observations revealthat atmospheric organosulfatesare important components in marine organic aerosols. The formationof organosulfates over marginal seas is driven by both marine phytoplanktonemissions and anthropogenic pollutants.