Rising Importance of Organosulfur Species for Aerosol Properties and Future Air Quality

21 January 2019, Version 1

Abstract

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.

Keywords

Secondary Organic Aerosols
Laboratory Studies
Field Measurements
Detailed Chemical Analysis
Organosulfur Compounds
Inorganic Sulfate
Isoprene Epoxydiols
Aerosol Phase State
Aerosol Acidity
mass spectrometry

Supplementary materials

Title
Description
Actions
Title
Organosulfur 2019 SI
Description
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