Mediterranean nascent sea spray organic aerosol and relationships with seawater biogeochemistry

Abstract. The organic mass fraction from sea spray aerosol (SSA) is currently a subject of intense research. majority this research dedicated to measurements in ambient air. However number studies have recently started focus on nascent aerosol. This work presents collected during 5-week cruise May and June 2017 the central western Mediterranean Sea, an oligotrophic marine region with low phytoplankton biomass. Surface seawater was continuously pumped into bubble-bursting apparatus generate Size distributions were measured differential mobility particle sizer (DMPS). Chemical characterization submicron performed time-of-flight chemical speciation monitor (ToF-ACSM) operating 10 min time resolution filter-based analysis daily basis. Using positive matrix factorization analysis, ToF-ACSM non-refractory matter (OMNR) separated four different types, identified as primary OA (POANR), oxidized (OOANR), methanesulfonic acid type (MSA-OANR), mixed (MOANR). In parallel, surface biogeochemical properties monitored providing information cell abundance particulate carbon (1 h resolution) microlayer (SML) dissolved (DOC) (on basis). Statistically robust correlations (for n>500) found between MOANR nanophytoplankton abundance, well POANR, OOANR, (POC). Parameterizations contributions types organics are proposed function for use models.