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    Original Research Papers

    Distribution of the partial pressure of CO2 in surface water (pCO2w) between Japan and the Hawaiian Islands: pCO2w—SST relationship in the winter and summer

    Authors:

    Hisayuki Y. Inoue ,

    Geochemical Research Department, Meteorological Research Institute, Nagamine 1-1, Tsukuba, Ibaraki 305-0052; Laboratory of Marine and Atmospheric Geochemistry, Graduate School of Environmental Earth Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, JP
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    Masao Ishii,

    Geochemical Research Department, Meteorological Research Institute, Nagamine 1-1, Tsukuba, Ibaraki 305-0052, JP
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    Hidekazu Matsueda,

    Geochemical Research Department, Meteorological Research Institute, Nagamine 1-1, Tsukuba, Ibaraki 305-0052, JP
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    Takeshi Kawano,

    Ocean Observation and Research Department, Japan Marine Science and Technology Center, 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, JP
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    Akihiko Murata,

    Ocean Observation and Research Department, Japan Marine Science and Technology Center, 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, JP
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    Yoshio Takasugi

    Research Division, National Institute for Sea Training, Independent Administrative Institution, Yokohama Municipal Government Building No. 2, 5-57, Kitanakadori, Naka-ku, Yokohama, Kanagawa 231-8435, JP
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    Abstract

    On the basis of measurements of the partial pressure of carbon dioxide in surface seawater (pCO2w) between Japan and the Hawaiian Islands in winter and summer, we examined the relationship between pCO2w and the sea surface temperature (SST) in the North Pacific Subtropical Gyre (NPSG). In winter, pCO2w correlated well with the SST (0.14–0.24% °C−1), suggesting a monotonous change in the carbonate system. However, in summer, five different pCO2w–SST relationships were found in the NPSG (including the Kuroshio Extension) due to changes in the relative contribution of ocean dynamics (upwelling, vertical mixing and advection), biological activity in the absence (very low level) of macro-nutrients and thermodynamics. The increase in pCO2w corresponding to a unit increase in the SST from January to July was low (<2.5% °C−1) west (leeward side) of the Hawaiian Islands (19–22°N, 158–168°W) and in the Kuroshio Extension (33–35°N, 140–165°E), and high (~3% °C−1) south of the Kuroshio Extension (25–30°N, 180–165°W) and the Hawaiian Islands (15–19°N, 157–162°W). This suggested that the drawdown of dissolved inorganic carbon was affected by the enhanced biological activity due to upwelling events associated with eddies and/or the transport of dissolved nutrients from gyre edges to the interior.

    How to Cite: Inoue, H.Y., Ishii, M., Matsueda, H., Kawano, T., Murata, A. and Takasugi, Y., 2003. Distribution of the partial pressure of CO2 in surface water (pCO2w) between Japan and the Hawaiian Islands: pCO2w—SST relationship in the winter and summer. Tellus B: Chemical and Physical Meteorology, 55(2), pp.456–465. DOI: http://doi.org/10.3402/tellusb.v55i2.16768
      Published on 01 Jan 2003
    Peer Reviewed
     CC BY 4.0
     Accepted on 3 Jul 2002            Submitted on 18 Feb 2002

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