Ice core profiles of saturated fatty acids (C-12:0-C-30:0) and oleic acid (C-18:1) from southern Alaska since 1734 AD: A link to climate change in the Northern Hemisphere

Pokhrel, Ambarish; Kawamura, Kimitaka; Seki, Osamu; Matoba, Sumito; Shiraiwa, Takayuki

Ice core profiles of saturated fatty acids (C-12:0-C-30:0) and oleic acid (C-18:1) from southern Alaska since 1734 AD: A link to climate change in the Northern Hemisphere

Pokhrel, Ambarish; Kawamura, Kimitaka; Seki, Osamu et al.

Atmospheric environment, 2015, 100, 202-209

Permalink : https://hdl.handle.net/2115/57981

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アクセス権	open access
URI	https://hdl.handle.net/2115/57981
タイトル	Ice core profiles of saturated fatty acids (C-12:0-C-30:0) and oleic acid (C-18:1) from southern Alaska since 1734 AD: A link to climate change in the Northern Hemisphere
著者	Pokhrel, Ambarish ; Kawamura, Kimitaka ; Seki, Osamu ; Matoba, Sumito ; Shiraiwa, Takayuki
著者名 Pokhrel, Ambarish
e-Rad_Researcher 70201449 著者名 Kawamura, Kimitaka
e-Rad_Researcher 30374648 著者名 Seki, Osamu
e-Rad_Researcher 30391163 著者名 Matoba, Sumito
e-Rad_Researcher 90235739 著者名 Shiraiwa, Takayuki
言語	英語
キーワード	Fatty acids
	Alaskan ice core
	Marine-derived organic matter
	Atmospheric circulation
	Atmospheric transport
	Climate change
発行日	2015-01
出版者	Elsevier
収録物名	Atmospheric environment
巻(号)	100
ページ	202-209
抄録	An ice core drilled at Aurora Peak in southeast Alaska was analyzed for homologous series of straight chain fatty acids (C-12:0-C-30:0) including unsaturated fatty acid (oleic acid) using gas chromatography (GC/FID) and GC/mass spectrometry (GC/MS). Molecular distributions of fatty acids are characterized by even carbon number predominance with a peak at palmitic acid (C-16:0, av. 20.3 +/- SD. 29.8 ng/g-ice) followed by oleic acid (C-18:1, 19.6 +/- 38.6 ng/g-ice) and myristic acid (C-14:0, 15.3 +/- 21.9 ng/g-ice). The historical trends of short-chain fatty acids, together with correlation analysis with inorganic ions and organic tracers suggest that short-chain fatty acids (except for C-12:0 and C-15:0) were mainly derived from sea surface micro layers through bubble bursting mechanism and transported over the glacier through the atmosphere. This atmospheric transport process is suggested to be linked with Kamchatka ice core SD record from Northeast Asia and Greenland Temperature Anomaly (GTA). In contrast, long-chain fatty acids (C-20.0-C-30:0) are originated from terrestrial higher plants, soil organic matter and dusts, which are also linked with GTA. Hence, this study suggests that Alaskan fatty acids are strongly influenced by Pacific Decadal Oscillation/North Pacific Gyre Oscillation and/or extra tropical North Pacific surface climate and Arctic oscillation. We also found that decadal scale variability of C-18:1/C-18:0 ratios in the Aurora Peak ice core correlate with the Kamchatka ice core SD, which reflects climate oscillations in the North Pacific. This study suggests that photochemical aging of organic aerosols could be controlled by climate periodicity. (C) 2014 Elsevier Ltd. All rights reserved.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	1352-2310
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.atmosenv.2014.11.007