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In the framework of the Chemistry-Aerosol MediterraneanExperiment, a measurement site was set up at a remote site (Ersa) on CorsicaIsland in the northwestern Mediterranean Sea. Measurement campaigns performedduring the summers of 2012 and 2013 showed high organic aerosolconcentrations, mostly from biogenic origin. This work aims to representthe organic aerosol concentrations and properties (oxidation state andhydrophilicity) using the air-quality model Polyphemus with a surrogateapproach for secondary organic aerosol (SOA) formation. Biogenic precursorsare isoprene, monoterpenes and sesquiterpenes. In this work, the followingmodel oxidation products of monoterpenes are added: (i) a carboxylic acid(MBTCA) to represent multi-generation oxidation products in the low-NOxregime, (ii) organic nitrate chemistry and (iii) extremely low-volatilityorganic compounds (ELVOCs) formed by ozonolysis. The model shows goodagreement of measurements of organic concentrations for both 2012 and 2013summer campaigns. The modelled oxidation property and hydrophilic organiccarbon properties of the organic aerosols also agree reasonably well with themeasurements. The influence of the different chemical processes added to themodel on the oxidation level of organics is studied. Measured and simulatedwater-soluble organic carbon (WSOC) concentrations show that even at a remote sitenext to the sea, about 64 % of the organic carbon is soluble. Theconcentrations of WSOC vary with the origins of the air masses and thecomposition of organic aerosols. The marine organic emissions only contributeto a few percent of the organic mass in PM1, with maxima above the sea

Modelling organic aerosol concentrations and properties during ChArMEx summer campaigns of 2012 and 2013 in the western Mediterranean region