Molecular distributions and isotopic compositions of organic aerosols over the western North Atlantic: Dicarboxylic acids, related compounds, sugars, and secondary organic aerosol tracers

Kawamura, Kimitaka; Hoque, Mir Md. Mozammal; Bates, Timothy S.; Quinn, Patricia K.

Molecular distributions and isotopic compositions of organic aerosols over the western North Atlantic: Dicarboxylic acids, related compounds, sugars, and secondary organic aerosol tracers

Kawamura, Kimitaka; Hoque, Mir Md. Mozammal; Bates, Timothy S. et al.

Organic geochemistry, 2017, 113, 229-238

Permalink : https://hdl.handle.net/2115/76047

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アクセス権	open access
URI	https://hdl.handle.net/2115/76047
タイトル	Molecular distributions and isotopic compositions of organic aerosols over the western North Atlantic: Dicarboxylic acids, related compounds, sugars, and secondary organic aerosol tracers
著者	Kawamura, Kimitaka ; Hoque, Mir Md. Mozammal ; Bates, Timothy S. ; Quinn, Patricia K.
e-Rad_Researcher 70201449 著者名 Kawamura, Kimitaka
著者名 Hoque, Mir Md. Mozammal
著者名 Bates, Timothy S.
著者名 Quinn, Patricia K.
言語	英語
キーワード	Marine aerosols
	Western North Atlantic
	Oxalic acid
	Photochemical aging
	Stable carbon isotopic composition
発行日	2017-11
出版者	Elsevier
収録物名	Organic geochemistry
巻(号)	113
ページ	229-238
抄録	Marine aerosols were collected over the western North Atlantic off the coast of Boston to Bermuda in August 2012 using a high-volume air sampler. Aerosol samples were analyzed for organic and elemental carbon (OC/EC), low molecular weight dicarboxylic acids and related compounds, lipid class compounds (n-alkanes, fatty acids and fatty alcohols), sugars and various secondary organic aerosol (SOA) tracers. Homologous series (C-2-C-12) of dicarboxylic acids (31-335 ng/m(3)) were detected with a predominance of oxalic acid. Diacids were found to be the most abundant compound class followed by monoterpeneSOA tracers > isoprene-SOA tracers > sugars > oxoacids > fatty alcohols > fatty acids > alpha-dicarbonyls > aromatic acids > n-alkanes. The concentrations of these compounds were higher in the coastal site and decreased towards the open ocean. However, the abundance of diacids stayed relatively high even in the remote ocean. Interestingly, contributions of oxalic acid to total aerosol carbon increased from the coast (2.3%) to the open ocean (5.6%) near Bermuda. Stable carbon isotope ratios of aerosol total carbon and individual diacids and oxoacids were determined using an isotope ratio mass spectrometer. The stable carbon isotopic composition of oxalic acid increased from the coast (-17.5%) to the open ocean (-12.4%), confirming that photochemical aging of organic aerosols occurred during the atmospheric over the ocean. Stable carbon isotope ratios of bulk aerosol carbon also increased from the coast near Boston (-24.3%) to the open ocean near Bermuda (-18.2%), consistent with photochemical aging of organic aerosols.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	0146-6380
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.orggeochem.2017.08.007