TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 59 (No. 6), pp. 883-891, 2003

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

Tsuneo Ono1*, Katsuyuki Sasaki2 and Ichiro Yasuda3

1Hokkaido National Fisheries Research Institute, 116 Katsurakoi, Kushiro 085-0802, Japan
2National Research Institute of Fisheries Science, Fukuura, Kanazawa-ku, Yokohama 236-8648, Japan
3Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

(Received 12 February 2003; in revised form 13 August 2003; accepted 13 August 2003)

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 "DC*" 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.

*Corresponding author E-mail: tono@fra.affrc.go.jp

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