Residual Transport of Suspended Material by Tidal Straining over the Sloping Continental Shelf

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  • 海底斜面上のtidal straining と懸濁物質の輸送過程
  • カイテイ シャメン ジョウ ノ tidal straining ト ケンダク ブッシツ ノ ユソウ カテイ

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Abstract

We provide evidence for the existence of tidal straining of horizontal density gradients, which are likely to result from the projection of the interior vertical stratification onto sloping topography. Based on microstructure data obtained over the sloping continental shelf of the East China Sea（ECS）in summer, we demonstrated that the tidal current shear interacting with the crossisobath density gradient results in semidiurnal switching between unstable and stable stratification in the lower part of the bottom boundary layer（BBL）. A one-dimensional model with turbulence closure reproduced the key features of the observations, in particular the strain-induced generation of unstable stratification during periods of upslope flow. By introducing passive tracers into the model, we suggested that the mixing asymmetry due to tidal straining generates the residual transport of suspended material, which is directed towards the inner continental shelf of the ECS.

Journal

  • Bulletin on Coastal Oceanography

    Bulletin on Coastal Oceanography 57 (1), 31-37, 2019

    Coastal Oceanography Research Committee, the Oceanographic Society of Japan

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