The global marine organic aerosol budget is investigated by a 3-dimensional chemistry-transport model considering recently proposed parameterisations of the primary marine organic aerosol (POA) and secondary organic aerosol (SOA) formation from the oxidation of marine volatile organic compounds. MODIS and SeaWiFS satellite data of Chlorophyll-a and ECMWF solar incoming radiation, wind speed, and temperature are driving the oceanic emissions in the model. Based on the adopted parameterisations, the SOA and the submicron POA marine sources are evaluated at about 5 Tg ( 1.5 Tg C ) and 7 to 8 Tg ( 4 Tg C ), respectively. The computed marine SOA originates from the dimethylsulfide oxidation ( 78%), the potentially formed dialkyl amine salts ( 21%), and marine hydrocarbon oxidation ( 0.1%). Comparison of calculations with observations indicates an additional marine source of soluble organic carbon that could be partially encountered by marine POA chemical ageing. 1. Introduction Organic aerosol (OA) attracts the attention of the scientific community due to their climate and health relevance [1–4]. Marine OA components are considered as important natural aerosol constituents, which significantly contribute to the global aerosol burden and affect Earth’s climate. Observations of OA in the marine atmosphere have shown the existence of significant amounts of primary organic carbon of marine origin [5, 6] in the submicron sea-spray, as well as a small relative contribution to the coarse mode sea-spay [7], over the ocean that seem to be related with the biological activity in the ocean [8]. The ocean also emits a complex mixture of organic gases (VOC) like alkenes, dimethyl sulphide (DMS) [5, 9–11], isoprene, monoterpenes [12–15], and aliphatic amines [7]. A few decades ago, DMS emissions from the oceans have been suggested to control cloudiness in the clean marine environment via sulphate ( ) aerosol formation (CLAW hypothesis [16]). DMS oxidation is known to produce and methane sulphonate ( ), both present in the aerosol phase, at proportions that depend on the meteorological conditions and oxidant levels in the marine environment [17, 18]. Vallina et al. [19] attributed between 35% and 80% of cloud condensation nuclei (CCN) in the Southern Ocean to biogenics of marine origin. They supported the central role of biogenic DMS emissions in controlling both number and variability of CCN over the remote ocean. containing both sulphur and carbon atoms is also a component of organic aerosol. Other VOCs with identified marine sources that are involved in secondary
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