Solid organic-coated ammonium sulfate particles at high relative humidity in the summertime Arctic atmosphere

SignificancePhysical and chemical properties of individual atmospheric particles determine their climate impacts. Hygroscopic inorganic salt particles mixed with trace amounts of organic material are predicted to be liquid under typical tropospheric conditions in the summertime Arctic. Yet, we unexp...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 119; no. 14; p. e2104496119
Main Authors Kirpes, Rachel M, Lei, Ziying, Fraund, Matthew, Gunsch, Matthew J, May, Nathaniel W, Barrett, Tate E, Moffett, Claire E, Schauer, Andrew J, Alexander, Becky, Upchurch, Lucia M, China, Swarup, Quinn, Patricia K, Moffet, Ryan C, Laskin, Alexander, Sheesley, Rebecca J, Pratt, Kerri A, Ault, Andrew P
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 05.04.2022
Proceedings of the National Academy of Sciences
Subjects
aerosol phase
Air masses
Ammonia
Ammonium
Ammonium sulfate
Arctic aerosol
Atmospheric aerosols
atmospheric chemistry
Atmospheric conditions
Atmospheric models
Chemical composition
Coatings
Dimethyl sulfide
Efflorescence
Emissions
ENVIRONMENTAL SCIENCES
Humidity
marine biogenic aerosol
Organic chemistry
Oxidation
Physical Sciences
Polar environments
Relative humidity
Sea ice
secondary aerosol
Semisolids
Solid phases
Sulfates
Sulfuric acid
Summer
Trace gases
Water uptake
Arctic region
aerosol phase
marine biogenic aerosol
secondary aerosol
Arctic aerosol
atmospheric chemistry
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Summary:SignificancePhysical and chemical properties of individual atmospheric particles determine their climate impacts. Hygroscopic inorganic salt particles mixed with trace amounts of organic material are predicted to be liquid under typical tropospheric conditions in the summertime Arctic. Yet, we unexpectedly observed a significant concentration of solid particles composed of ammonium sulfate with an organic coating under conditions of high relative humidity and low temperature. These particle properties are consistent with marine biogenic-derived new particle formation and growth, with particle collision hypothesized to result in the solid phase. This particle source is predicted to have increasing relevance in the context of declining Arctic sea ice and increasing open water, with impacts on clouds, and therefore climate.
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National Science Foundation (NSF)
PNNL-SA-160900
National Oceanic and Atmospheric Administration (NOAA)
USDOE Office of Science (SC), Biological and Environmental Research (BER)
SC0019172; DOE ARM field campaign 2013-6660; AC06-76RL01830; CHE-1654149; AC05-76RL01830
Edited by Mark Thiemens, University of California San Diego, La Jolla, CA; received March 12, 2021; accepted January 25, 2022
4Present address: Sonoma Technology, Petaluma, CA 94954.
2Present address: Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
5Present address: Department of Chemistry, Purdue University, West Lafayette, IN 47907.
Author contributions: K.A.P. and A.P.A. designed research; R.K., Z.L., M.F., M.J.G., N.W.M., T.E.B., C.E.M., A.J.S., and L.M.U. performed research; S.C., P.K.Q., R.C.M., A.L., and R.J.S. contributed new reagents/analytic tools; R.K., Z.L., M.F., M.J.G., N.W.M., T.E.B., C.E.M., A.J.S., B.A., L.M.U., K.A.P., and A.P.A. analyzed data; and R.K., K.A.P., and A.P.A. wrote the paper.
3Present address: Physical Sciences Division, University of Washington Bothell, Bothell, WA 98011.
1Present address: Department of Atmospheric Sciences, Texas A&M University, College Station, TX, 77843.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.2104496119