Sediment core profiles of long‐chain n‐alkanes in the Sea of Okhotsk: Enhanced transport of terrestrial organic matter from the last deglaciation to the early Holocene

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  • O. Seki
    Institute of Low Temperature Science Hokkaido University Hokkaido Japan
  • K. Kawamura
    Institute of Low Temperature Science Hokkaido University Hokkaido Japan
  • T. Nakatsuka
    Institute of Low Temperature Science Hokkaido University Hokkaido Japan
  • K. Ohnishi
    Institute of Low Temperature Science Hokkaido University Hokkaido Japan
  • M. Ikehara
    Institute of Low Temperature Science Hokkaido University Hokkaido Japan
  • M. Wakatsuchi
    Institute of Low Temperature Science Hokkaido University Hokkaido Japan

抄録

<jats:p>Terrestrial plant‐derived n‐alkanes (C<jats:sub>25–</jats:sub>C<jats:sub>35</jats:sub>) were measured in three piston cores (PC1, PC2 and PC4) in the Sea of Okhotsk covering the last 30 kyrs. Down core profiles of the n‐alkane concentrations and mass accumulation rates (MAR) were characterized by deglacial maxima. In particular, cores PC2 and PC4, which were collected from the central and western Sea of Okhotsk, respectively, show a two‐step increase around the Meltwater Pulse events (MWP) 1A (14.5–13.5 kyr BP) and 1B (about 10 kyr BP). This finding was interpreted by the outflow of terrestrial organic matter from the submerged land shelf to the Sea of Okhotsk through the East Sakhalin Current. This study demonstrated that the sea level rise forced by global warming in the deglaciation period may have caused the enhanced transport of terrestrial organic matter in marginal seas.</jats:p>

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