Effects of Atmospheric Aging Processes on Nascent Sea Spray Aerosol Physicochemical Properties.

Autor:	Kaluarachchi CP; Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States., Or VW; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States., Lan Y; Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States., Hasenecz ES; Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States., Kim D; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States., Madawala CK; Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States., Dorcé GP; Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States., Mayer KJ; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States., Sauer JS; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States., Lee C; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States., Cappa CD; Department of Civil and Environmental Engineering, University of California, Davis, California 95616, United States., Bertram TH; Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States., Stone EA; Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States., Prather KA; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States.; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States., Grassian VH; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States.; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States., Tivanski AV; Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States.
Jazyk:	angličtina
Zdroj:	ACS earth & space chemistry [ACS Earth Space Chem] 2022 Nov 17; Vol. 6 (11), pp. 2732-2744. Date of Electronic Publication: 2022 Oct 25.
DOI:	10.1021/acsearthspacechem.2c00258
Abstrakt:	The effects of atmospheric aging on single-particle nascent sea spray aerosol (nSSA) physicochemical properties, such as morphology, composition, phase state, and water uptake, are important to understanding their impacts on the Earth's climate. The present study investigates these properties by focusing on the aged SSA (size range of 0.1-0.6 μm) and comparing with a similar size range nSSA, both generated at a peak of a phytoplankton bloom during a mesocosm study. The aged SSAs were generated by exposing nSSA to OH radicals with exposures equivalent to 4-5 days of atmospheric aging. Complementary filter-based thermal optical analysis, atomic force microscopy (AFM), and AFM photothermal infrared spectroscopy were utilized. Both nSSA and aged SSA showed an increase in the organic mass fraction with decreasing particle sizes. In addition, aging results in a further increase of the organic mass fraction, which can be attributed to new particle formation and oxidation of volatile organic compounds followed by condensation on pre-existing particles. The results are consistent with single-particle measurements that showed a relative increase in the abundance of aged SSA core-shells with significantly higher organic coating thickness, relative to nSSA. Increased hygroscopicity was observed for aged SSA core-shells, which had more oxygenated organic species. Rounded nSSA and aged SSA had similar hygroscopicity and no apparent changes in the composition. The observed changes in aged SSA physicochemical properties showed a significant size-dependence and particle-to-particle variability. Overall, results showed that the atmospheric aging can significantly influence the nSSA physicochemical properties, thus altering the SSA effects on the climate. Competing Interests: The authors declare no competing financial interest. (© 2022 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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