Annual Anthropogenic Carbon Transport into the North Pacific Intermediate Water through the Kuroshio/Oyashio Interfrontal Zone: An Estimation from CFCs Distribution |
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| Authors: | Tsuneo Ono Yutaka W Watanabe Katsuyuki Sasaki |
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| Institution: | (1) National Research Institute of Fisheries Science (NRIFS), 12-4 Fukuura, Kanazawa-ku, Yokohama, 236-8648, Japan;(2) National Research Institute for Resources and Environment, 16-3 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan;(3) National Research Institute of Fisheries Science (NRIFS), 12-4 Fukuura, Kanazawa-ku, Yokohama, 236-8648, Japan |
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| Abstract: | Vertical distribution of anthropogenic carbon content of the water (exDIC) in the Oyashio area just outside of the Kuroshio/Oyashio Interfrontal Zone (K/O Zone) was estimated by the simple 1-D advection-diffusion model calibrated by the distribution of chlorofluorocarbons (CFCs). The average concentration of exDIC for   = 26.60–27.00 is multiplied by the volume transport of Oyashio water into the North Pacific Intermediate Water (NPIW) to estimate the annual transport of exDIC into NPIW through K/O Zone. The estimated transport of exDIC was 0.018–0.020 GtC/y, which corresponds to 15% of the whole total exDIC accumulation in the temperate North Pacific. A simple assessment using the NPIW 1-box model indicates that the current study explains at least 70% of the total annual transport of exDIC into NPIW, and that small exDIC sources for NPIW still exists in addition to K/O Zone. |
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| Keywords: | exDIC CFCs NPIW transport K/O zone |
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