Labile Peroxides in Secondary Organic Aerosol

摘要: Summary Peroxide-containing highly oxygenated molecules (HOMs) are formed upon ozonolysis of terpenes emitted from the biosphere and expected to be a major driving force for formation new particles secondary organic aerosol (SOA) in atmosphere. We evaluate model contribution of organic peroxides α-pinene SOA their evolution under different conditions. determine HOM molar yield ∼5%, contributing 30% initial mass. Although these compounds is kinetically favored, we demonstrate that they thermodynamically unstable with half-lives shorter than 1 hr dark Their decomposition significantly alters chemical composition, volatility, oxidation state. show photolysis carbonyls occurring within timescale hours an efficient but largely overlooked mechanism by which may evolve Both pathways add better understanding aerosol-climate interaction health effects SOA.