Vapor-pressure pathways initiate but hydrolysis products dominate the aerosol estimated from organic nitrates.

ABSTRACT: Organic nitrates contribute significantly to the total organic aerosol burden. However, the formation and loss mechanisms of particulate organic nitrates (PONs) remain poorly understood. In this study, with the CMAQ modeling system, we implement a detailed biogenic volatile organic carbon gas phase oxidation mechanism and an explicit representation of multiphase organic nitrate formation and loss, including both aqueous-phase uptake and vapor-pressure driven partitioning into organic aerosol as well as condensed-phase reactions. We find vapor-pressure dependent partitioning is the leading mechanism for formation of PONs and hydrolysis is a major loss mechanism for PON resulting in substantial amounts of organic aerosol that originate as an organic nitrate. Partitioning and hydrolysis toget

SUBMITTER: Zare A 

PROVIDER: S-EPMC6820051 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature