Cloud Processing of Secondary Organic Aerosol from Isoprene and Methacrolein Photooxidation.

ABSTRACT: Aerosol-cloud interaction contributes to the largest uncertainties in the estimation and interpretation of the Earth's changing energy budget. The present study explores experimentally the impacts of water condensation-evaporation events, mimicking processes occurring in atmospheric clouds, on the molecular composition of secondary organic aerosol (SOA) from the photooxidation of methacrolein. A range of on- and off-line mass spectrometry techniques were used to obtain a detailed chemical characterization of SOA formed in control experiments in dry conditions, in triphasic experiments simulating gas-particle-cloud droplet interactions (starting from dry conditions and from 60% relative humidity (RH)), and in bulk aqueous-phase experiments. We observed that cloud events trigger fast SOA for

SUBMITTER: Giorio C 

PROVIDER: S-EPMC5642272 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature