Abstract
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 yr−1 (~1.5 Tg C yr−1) and 7 to 8 Tg yr−1 (~4 Tg C yr−1), 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.
Highlights
Organic aerosol (OA) attracts the attention of the scientific community due to their climate and health relevance [1,2,3,4]
The computed global distributions of marine primary marine organic aerosol (POA), secondary organic aerosol (SOA) from marine isoprene and monoterpenes, MS− from dimethyl sulphide (DMS) oxidation and potentially formed amine sulfates are calculated by TM4ECPL every time-step, monthly mean values are stored and analyzed here below
Monoterpenes and isoprene oxidation is calculated to produce about 0.1 Tg yr−1, MS− contribution to SOA is 4 Tg yr−1 and in the case of taking into account marine alkyl amine salts marine SOA production is increasing by 1 Tg yr−1
Summary
Organic aerosol (OA) attracts the attention of the scientific community due to their climate and health relevance [1,2,3,4]. We computed the SOA formation from marine emissions of isoprene, monoterpenes, DMS, and amines, together with the primary organic aerosol (POA) marine emissions Both primary and secondary OA distributions are calculated online driven by wind speed, temperature, solar radiation, and ocean productivity (represented by chlorophyll-a), as well as atmospheric oxidant levels that are calculated online [35]. As summarized by Ervens et al [24] and references therein, isoprene chemistry can form SOA via cloud processing that consists of partitioning of isoprene oxygenated products like glyoxal, methylglyoxal, and pyruvic acid to the cloud water and subsequent in cloud oxidation to form glycolic, glyoxylic and oxalic acids These mechanisms are parameterized in our model based on the linearized relationship recently published by Ervens et al [24] for stratiform clouds, using the cloud occurrence and lifetime, the liquid water content of clouds, isoprene concentration, and the VOC/NOx conditions in each grid and assuming one SOA product from all incloud reactions. Model results are evaluated against observations in the marine environment
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call