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Re-Estimation of Annual Anthropogenic Carbon Input from Oyashio into North Pacific Intermediate Water

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Abstract

The annual transport of anthropogenic carbon (Canth) to the North Pacific Intermediate Water (NPIW) from the Western Subarctic Gyre (WSG) has been re-estimated by using newly estimated Oyashio transport and Canth concentration, the latter calculated by the recently-established “ΔC*” method with some modifications. Estimated annual Canth transport through the nearshore Oyashio west of 146°E was 0.020 ± 0.010 GtC y−1, closely approximating the previous estimation based on a 1-D model calibrated with the CFC vertical distribution. The present study, however, found that an additional 0.025 ± 0.010 GtC y−1 of Canth was transported into NPIW in the region east of 146°E. Total Canth transport, 0.045 GtC y−1, contributes about 35% of annual Canth accumulation of the whole temperate North Pacific.

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Authors and Affiliations

  1. Hokkaido National Fisheries Research Institute, 116 Katsurakoi, Kushiro, 085-0802, Japan

    Tsuneo Ono

  2. National Research Institute of Fisheries Science, Fukuura, Kanazawa-ku, Yokohama, 236-8648, Japan

    Katsuyuki Sasaki

  3. Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

    Ichiro Yasuda

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  1. Tsuneo Ono
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  2. Katsuyuki Sasaki
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  3. Ichiro Yasuda
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Ono, T., Sasaki, K. & Yasuda, I. Re-Estimation of Annual Anthropogenic Carbon Input from Oyashio into North Pacific Intermediate Water. Journal of Oceanography 59, 883–891 (2003). https://doi.org/10.1023/B:JOCE.0000009578.19174.d4

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  • DOI: https://doi.org/10.1023/B:JOCE.0000009578.19174.d4

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