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1. Introduction[2] The possibility that seawater aerosols injected into theatmosphere through mechanical processes may possess ahydrophobic organic monolayer was first proposed by Gillet al. [1983] and furthered by Ellison et al. [1999]. Theresulting aerosol is described as an inverse micelle with thepolar carboxylic head groups of the fatty acid (lipid,RCO2H) oriented into the water droplet and the acyl chainsoriented out toward the atmosphere. It is highly likely thatsimilar fat-coated aerosols originate from freshwater sourcesas well. Since the solubility of surfactants in salt watershould be lower than that in freshwater, one might hypothesizethat fat coats on sea-salt versus freshwater aerosolsmay differ in the orientation of the surface fatty acidmolecules, thereby potentially affecting rates of reactionbetween fatty acids and atmospheric oxidants. The role thatthese fat-coated aerosols play in atmospheric chemistrydepends on the oxidation of the hydrophobic shell.[3] Aerosol growth through uptake of water and volatileorganic compounds will only occur when oxidizedacyl chains are present in the fat coat [Ellison et al.,1999]. Fieldwork by Tervahattu et al. [2002a, 2002b,2005] demonstrated that fat coats do exist on somemarine and continental aerosols and that oleic acid[CH3(CH2)7CH==CH(CH2)7CO2H] is the most prevalentunsaturated fatty acid found in the fat coats of marine
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