气候变化领域集成服务门户(CCPortal): North Atlantic marine organic aerosol characterized by novel offline thermal desorption mass spectrometry: Polysaccharides; recalcitrant material; and secondary organics

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DOI	10.5194/acp-20-16007-2020
	North Atlantic marine organic aerosol characterized by novel offline thermal desorption mass spectrometry: Polysaccharides; recalcitrant material; and secondary organics
	Lawler M.J.; Lewis S.L.; Russell L.M.; Quinn P.K.; Bates T.S.; Coffman D.J.; Upchurch L.M.; Saltzman E.S.
发表日期	2020
ISSN	1680-7316
起始页码	16007
结束页码	16022
卷号	20 期号:24
英文摘要	The composition of organic compounds in marine aerosols and the relative contributions of primary and secondary organic compounds remain uncertain. We report results from a novel approach to characterize and quantify organic components of the marine aerosol. Size-segregated discrete aerosol filter samples were collected at sea in the North Atlantic from both ambient aerosol and artificially generated primary sea spray over four cruises timed to capture the seasonal phytoplankton bloom dynamics. Samples were analyzed by Fourier transform infrared spectroscopy (FTIR), extracted into water, and analyzed by offline thermal desorption chemical ionization mass spectrometry (TDCIMS) and ion chromatography (IC). A positive matrix factorization (PMF) analysis identified several characteristic aerosol components in the TDCIMS mass spectra. Among these is a polysaccharide factor representing about 10 %-30% of the submicron organic aerosol mass. Aerosol polysaccharide V sodium mass ratios were consistently higher in ambient air than in the artificially generated sea spray, and we hypothesize that this results from more rapid wet deposition of sodium-rich aerosol. An unquantified recalcitrant factor of highly thermally stable organics showed significant correlation with FTIR-measured alcohol groups, consistently the main organic functional group associated with sea spray aerosol.We hypothesize that this factor represents recalcitrant dissolved organic matter (DOM) in seawater and that by extension alcohol functional groups identified in marine aerosol may more typically represent recalcitrant DOM rather than biogenic saccharide-like material, contrary to inferences made in previous studies. The recalcitrant factor showed little seasonal variability in its contribution to primary marine aerosol. The relative contribution of polysaccharides was highest in late spring and summer in the smallest particle size fraction characterized (< 180 nm). © 2020 Author(s).
英文关键词	aerosol; ambient air; chemical composition; dissolved organic matter; FTIR spectroscopy; marine atmosphere; mass spectrometry; polysaccharide; wet deposition; Atlantic Ocean; Atlantic Ocean (North)
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168863
作者单位	Department of Earth System Science, University of California, Irvine, Irvine, CA, United States; Department of Chemistry, University of California, Irvine, Irvine, CA, United States; Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States; Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, WA, United States; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Lawler M.J.,Lewis S.L.,Russell L.M.,et al. North Atlantic marine organic aerosol characterized by novel offline thermal desorption mass spectrometry: Polysaccharides; recalcitrant material; and secondary organics[J],2020,20(24).
APA	Lawler M.J..,Lewis S.L..,Russell L.M..,Quinn P.K..,Bates T.S..,...&Saltzman E.S..(2020).North Atlantic marine organic aerosol characterized by novel offline thermal desorption mass spectrometry: Polysaccharides; recalcitrant material; and secondary organics.Atmospheric Chemistry and Physics,20(24).
MLA	Lawler M.J.,et al."North Atlantic marine organic aerosol characterized by novel offline thermal desorption mass spectrometry: Polysaccharides; recalcitrant material; and secondary organics".Atmospheric Chemistry and Physics 20.24(2020).