Статья

The Impact of Aerosol Particle Mixing State on the Hygroscopicity of Sea Spray Aerosol

Steven R. SchillDepartment of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United StatesDouglas B. CollinsDepartment of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United StatesChristopher LeeDepartment of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United StatesHolly S. MorrisDepartment of Chemistry, University of Iowa, Iowa City, Iowa 52242, United StatesGordon A. NovakDepartment of Chemistry, University of Wisconsin Madison, Madison, Wisconsin 53706, United StatesKimberly A. PratherDepartment of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United StatesPatricia K. QuinnPacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, Washington 98115, United StatesCamille M. SultanaDepartment of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United StatesAlexei V. TivanskiDepartment of Chemistry, University of Iowa, Iowa City, Iowa 52242, United StatesKathryn ZimmermannDepartment of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United StatesChristopher D. CappaDepartment of Civil and Environmental Engineering, University of California Davis, Davis, California 95616, United StatesTimothy H. BertramDepartment of Chemistry, University of Wisconsin Madison, Madison, Wisconsin 53706, United States

2015en

ABI

Аннотация

Aerosol particles influence global climate by determining cloud droplet number concentrations, brightness, and lifetime. Primary aerosol particles, such as those produced from breaking waves in the ocean, display large particle-particle variability in chemical composition, morphology, and physical phase state, all of which affect the ability of individual particles to accommodate water and grow into cloud droplets. Despite such diversity in molecular composition, there is a paucity of methods available to assess how particle-particle variability in chemistry translates to corresponding differences in aerosol hygroscopicity. Here, an approach has been developed that allows for characterization of the distribution of aerosol hygroscopicity within a chemically complex population of atmospheric particles. This methodology, when applied to the interpretation of nascent sea spray aerosol, provides a quantitative framework for connecting results obtained using molecular mimics generated in the laboratory with chemically complex ambient aerosol. We show that nascent sea spray aerosol, generated in situ in the Atlantic Ocean, displays a broad distribution of particle hygroscopicities, indicative of a correspondingly broad distribution of particle chemical compositions. Molecular mimics of sea spray aerosol organic material were used in the laboratory to assess the volume fractions and molecular functionality required to suppress sea spray aerosol hygroscopicity to the extent indicated by field observations. We show that proper accounting for the distribution and diversity in particle hygroscopicity and composition are important to the assessment of particle impacts on clouds and global climate.

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Идентификаторы

DOI: 10.1021/acscentsci.5b00174

Цитирования и источники

Цитирований: 2Использованных источников: 0

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