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

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Title: Fluxes, source and transport of organic matter in the western Sea of Okhotsk: Stable carbon isotopic ratios of n-alkanes and total organic carbon
Authors: Seki, Osamu1 Browse this author →KAKEN DB
Yoshikawa, Chisato Browse this author
Nakatsuka, Takeshi Browse this author →KAKEN DB
Kawamura, Kimitaka Browse this author →KAKEN DB
Wakatsuchi, Masaaki Browse this author →KAKEN DB
Authors(alt): 関, 宰1
Keywords: Terrestrial organic matter
Terrestrial biomarker
Stable carbon isotope
Settling particles
Sea of Okhotsk
Issue Date: Feb-2006
Publisher: Elsevier Ltd.
Journal Title: Deep Sea Research Part I: Oceanographic Research Papers
Volume: 53
Issue: 2
Start Page: 253
End Page: 270
Publisher DOI: 10.1016/j.dsr.2005.11.004
Abstract: 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.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 関 宰

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