Distribution of the Subsurface Chlorophyll Maximum and its Nutrient-Light Environment in and Around the Kuroshio off Japan

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  • 黒潮とその周辺における亜表層クロロフィル極大の小規模スケール分布と栄養塩・光環境
  • Distribution of the subsurface chlorophyll maximum and its nutrient-light environment in and around the Euroshio off Japan

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Continuous distribution of the subsurface chlorophyll maximum (SCM) was confirmed in the Kuroshio and neighbouring areas in observations at 15 to 40km intervals. Chlorophyll amounts occurring in and immediately around the SCM constituted 60 to 80% of the total chlorophyll in the water column above the 1% light level. The SCM zone received 1 to 10% of the surface irradiance at its center and contained sufficient macronutrients to support approximately one doubling of the existing phytoplankton biomass at most stations. There were several stations where there were higher nutrient concentrations that would support more than one doubling of the existing biomass around the SCM zone, and this was interpreted as resulting from uplift of the SCM zone due to upwelling.

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