Fluxes, source and transport of organic matter in the western Sea of Okhotsk: Stable carbon isotopic ratios of n-alkanes and total organic carbon

Seki, Osamu; Yoshikawa, Chisato; Nakatsuka, Takeshi; Kawamura, Kimitaka; Wakatsuchi, Masaaki

Fluxes, source and transport of organic matter in the western Sea of Okhotsk: Stable carbon isotopic ratios of n-alkanes and total organic carbon

Seki, Osamu; Yoshikawa, Chisato; Nakatsuka, Takeshi et al.

Deep Sea Research Part I: Oceanographic Research Papers, 2006, 53(2), 253-270

Permalink : https://hdl.handle.net/2115/6123

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アクセス権	open access
URI	https://hdl.handle.net/2115/6123
タイトル	Fluxes, source and transport of organic matter in the western Sea of Okhotsk: Stable carbon isotopic ratios of n-alkanes and total organic carbon
著者	Seki, Osamu ; Yoshikawa, Chisato ; Nakatsuka, Takeshi ; Kawamura, Kimitaka ; Wakatsuchi, Masaaki
e-Rad_Researcher 30374648 著者名 Seki, Osamu 関, 宰
著者名 Yoshikawa, Chisato
e-Rad_Researcher 60242880 著者名 Nakatsuka, Takeshi
e-Rad_Researcher 70201449 著者名 Kawamura, Kimitaka
e-Rad_Researcher 60002101 著者名 Wakatsuchi, Masaaki
言語	英語
キーワード	Terrestrial organic matter
	Terrestrial biomarker
	Hydrocarbons
	Stable carbon isotope
	Settling particles
	Sediment
	Sea of Okhotsk
発行日	2006-02
出版者	Elsevier Ltd.
収録物名	Deep Sea Research Part I: Oceanographic Research Papers
巻(号)	53(2)
ページ	253-270
抄録	Settling particles and surface sediments collected from the western region of the Sea of Okhotsk were analyzed for total organic carbon (TOC), long-chain n-alkanes and their stable carbon isotope ratio (δ13C) to investigate sources and transport of total and terrestrial organic matter in the western region of the sea. The δ13C measurements of TOC in time-series sediment traps indicate lateral transport of resuspended organic matter from the northwestern continental shelf to the area off Sakhalin via the dense shelf water (DSW) flow at intermediate depth. The n-alkanes in the surface sediments showed strong odd carbon number predominance with relatively lighter δ13C values (from −33‰ to −30‰). They fall within the typical values of C3-angiosperms, which is the main vegetation in east Russia, including the Amur River basin. On the other hand, the molecular distributions and δ13C values of n-alkanes in the settling particles clearly showed two different sources: terrestrial plant and petroleum in the Sea of Okhotsk. We reconstructed seasonal change in the fluxes of terrestrial n-alkanes in settling particles using the mixing model proposed by Lichtfouse and Eglinton [1995. 13C and 14C evidence of a soil by fossil fuel and reconstruction of the composition of the pollutant. Organic Geochemistry 23, 969–973]. Results of the terrestrial n-alkane fluxes indicate that there are two transport pathways of terrestrial plant n-alkanes to sediments off Sakhalin, the Sea of Okhotsk. One is lateral transport of resuspended particles with lithogenic material from the northwestern continental shelf by the DSW flow. Another is the vertical transport of terrestrial plant n-alkanes, which is independent of transport of lithogenic material. The latter may include dry/wet deposition of aerosol particles derived from terrestrial higher plants possibly associated with forest fires in Siberia.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0967-0637
関連情報	URI http://www.sciencedirect.com/science/journal/09670637
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.dsr.2005.11.004