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Rising Importance of Organosulfur Species for Aerosol Properties and Future Air Quality
preprintsubmitted on 17.01.2019, 15:36 and posted on 21.01.2019, 14:15 by Matthieu Riva, Yuzhi Chen, Zhang, Yue, Ziying Lei, Nicole Olson, Hallie Boyer Chelmo, Shweta Narayan, Lindsay Yee, Hilary Green, Tianqu Cui, Zhenfa Zhang, Karsten Baumann, Mike Fort, Eric Edgerton, Sari Budisulistiorini, Caitlin Rose, Igor Ribeiro, Rafael e Oliveira, Erickson dos Santos, Cristine Machado, Sophie Szopa, Yue Zhao, Elianne Alves, Suzanne de Sá, Weiwei Hu, Eladio Knipping, Stephanie Shaw, Sergio Duvoisin Junior, Rodrigo de Souza, Brett Palm, Jose Jimenez, Marianne Glasius, Allen Goldstein, Havala Pye, Avram Gold, Barbara Turpin, William Vizuete, Martin, Scot, Joel Thornton, Cari Dutcher, Andrew Ault, Jason Surratt
Acid-driven multiphase chemistry of isoprene epoxydiols (IEPOX), a key isoprene oxidation product, with inorganic sulfate aerosol yields substantial amounts of secondary organic aerosol (SOA) through the formation of organosulfur. The extent and implications of inorganic-to-organic sulfate conversion, however, are unknown. Herein, we reveal that extensive consumption of inorganic sulfate occurs, which increases with the IEPOX-to-inorganic sulfate ratio (IEPOX:Sulfinorg), as determined by laboratory and field measurements. We further demonstrate that organosulfur greatly modifies critical aerosol properties, such as acidity, morphology, viscosity, and phase state. These new mechanistic insights reveal that changes in SO2 emissions, especially in isoprene-dominated environments, will significantly alter biogenic SOA physicochemical properties. Consequently, IEPOX:Sulfinorg will play a central role in understanding historical climate and determining future impacts of biogenic SOA on global climate and air quality.