The Impact of Divalent Cations on the Enrichment of Soluble Saccharides in Primary Sea Spray Aerosol

摘要: Field measurements have shown that sub-micrometer sea spray aerosol (SSA) is significantly enriched in organic material, of which a large fraction has been attributed to soluble saccharides. Existing mechanistic models SSA production struggle replicate the observed enhancement material. Here, we assess role for divalent cation mediated co-adsorption charged surfactants and saccharides enrichment material SSA. Using particle supersaturated hygroscopicity, calculate volume fractions molecular mimics generated from Marine Aerosol Reference Tank. Large enhancements (Xorg > 0.2) were 50 nm dry diameter (dp) particles experiments where cooperative ionic interactions favorable (e.g., palmitic acid, Mg2+, glucuronic acid) at seawater total carbon concentrations (<1.15 mM C) ocean pH. Significantly smaller < 1.5 × 10−3) derived direct saccharide collected with diameters <250 nm, suggesting strongly size dependent. The results presented here indicate organics insoluble surface may contribute extent this mechanism explains nascent depends on concentration, speciation, charge microlayer.