Diapycnal Mixing Processes and Their Impacts Along the Kuroshio from its Upstream to the Kuroshio Extension

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  • 黒潮上流から続流の鉛直混合過程とその影響に関する考察
  • クロシオ ジョウリュウ カラ ゾク リュウ ノ エンチョク コンゴウ カテイ ト ソノ エイキョウ ニ カンスル コウサツ

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The Kuroshio strongly influences the weather and ecosystem in the North Pacific. In this article, the diapycnal mixing processes along the Kuroshio and their roles in supplying nutrients from the Kuroshio nutrient stream are discussed using previous measurements and numerical simulations. According to our results, strong turbulence upstream of the Kuroshio, which flows over seamounts, can continuously produce nitrate diffusive vertical flux of O（1mmol N m－2 day－1）．On the other hand, in the subsurface downstream, the Kuroshio Extension, turbulence is weak, but vertical shear of the meso- and submesoscale, and that of near-inertial waves can tilt the preexisting thermohaline anomalies on the density surface, generating active double-diffusive convection, which may transport nutrients to the shallower layer. In the shallow thermocline below the mixed layer front on top of the Kuroshio Extension, a nutrient interleaving layer is observed, which is entrained into the surface mixed layer by the upper layer turbulence. The nutrient supply through the induction is found to be strongly influenced by the mesoscale spatial variabilities in the mixed layer depth.

Journal

  • Bulletin on Coastal Oceanography

    Bulletin on Coastal Oceanography 57 (1), 43-58, 2019

    Coastal Oceanography Research Committee, the Oceanographic Society of Japan

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