4.7 Article

Deep intense vertical mixing in the Bussol' Strait

Journal

GEOPHYSICAL RESEARCH LETTERS
Volume 39, Issue -, Pages -

Publisher

AMER GEOPHYSICAL UNION
DOI: 10.1029/2011GL050349

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Funding

  1. Ministry of Education, Science, Sports and Culture of Japan [KAKENHI 20221002]
  2. Grants-in-Aid for Scientific Research [20221002] Funding Source: KAKEN

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To reveal the intensity of deep mixing in the Bussol' Strait, we performed the direct observations of turbulence for the first time. Vigorous vertical mixing with a turbulent energy dissipation rate epsilon above 10(-6) W/kg and diapycnal diffusivity K(rho) above 10(3) cm(2)/s were observed at depths of 600-1300 m (potential densities of 27.0-27.5 sigma(theta)) at the western gap of the Bussol' Strait, possibly affecting water-mass transformation and thermohaline circulation. The strong vertical mixing with a diurnal period occurred when the diurnal tidal current flowed toward the Okhotsk Sea, corresponding to a period of enhanced shear consisting of the mean flow with a two-layered structure and the large-amplitude diurnal tidal current with a vertical structure explained by a low-vertical mode topographically trapped wave. The empirical relationship of epsilon = 10(-1.46 +/- 1.91) x S(2.16 +/- 0.72) is obtained between. and the shear S reconstructed from the 50-m-scale mean, diurnal, and semi-diurnal tidal currents. Citation: Yagi, M., and I. Yasuda (2012), Deep intense vertical mixing in the Bussol' Strait, Geophys. Res. Lett., 39, L01602, doi: 10.1029/2011GL050349.

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