Effect of structural heterogeneity in chemical composition on online single-particle mass spectrometry analysis of sea spray aerosol particles

TitleEffect of structural heterogeneity in chemical composition on online single-particle mass spectrometry analysis of sea spray aerosol particles
Publication TypeJournal Article
Year of Publication2017
AuthorsSultana C.M, Collins DB, Prather KA
JournalEnvironmental Science & Technology
Volume51
Pagination3660-3668
Date Published2017/04
Type of ArticleArticle
ISBN Number0013-936X
Accession NumberWOS:000398646500009
Keywordsaerosols; atmospheric particles; behavior; bubble; cloud condensation nuclei; hygroscopic; marine aerosol; mixing state; primary organic aerosol; raman microspectroscopy; salt droplets; tropospheric
Abstract

Knowledge of the surface composition of sea spray aerosols (SSA) is critical for understanding and predicting climate-relevant impacts. Offline microscopy and spectroscopy studies have shown that dry supermicron SSA tend to be spatially heterogeneous particles with sodium- and chloride-rich cores surrounded by organic enriched surface layers containing minor inorganic seawater components such as magnesium and calcium. At the same time, single-particle mass spectrometry reveals several different mass spectral ion patterns, suggesting that there may be a number of chemically distinct particle types. This study investigates factors controlling single particle mass spectra of nascent supermicron SSA. Depth profiling experiments conducted on SSA generated by a fitted bubbler and total ion intensity analysis of SSA generated by a marine aerosol reference tank were compared with observations of ambient SSA observed at two coastal locations. Analysis of SSA produced by utilizing controlled laboratory methods reveals that single-particle mass spectra with weak sodium ion signals can be produced by the desorption of the surface of typical dry SSA particles composed of salt cores and organic-rich coatings. Thus, this lab-based study for the first time unifies findings from offline and online measurements as well as lab and field studies of the SSA particle-mixing state.

DOI10.1021/acs.est.6b06399
Short TitleEnviron. Sci. Technol.
Student Publication: 
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