open access

https://hdl.handle.net/2115/630

Distribution of the partial pressure of CO2 in surface water (pCO2w) between Japan and the Hawaiian Islands: pCO2wSST relationship in the winter and summer

英語

Sea Surface Temperature

2003-04

Blackwell

Tellus B

55(2)

456-465

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 the pCO2w and the sea surface temperature (SST) in the North Pacific Subtropical Gyre (NPSG). In winter, the 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), the biological activity under the absence (very low level) of macro-nutrients, and thermodynamics. The increase in the pCO2w against the 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 (33-35ºN, 140-165ºE), 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.

学術雑誌論文

Accepted Manuscript

Copyright (c) 2003 Blackwell Munksgaad. Published on behalf of the Swedish Geophysical Society

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