report the results of direct detailed hydrographic,
velocity, and microstructural observations made over a
period of about 24 h at three stations surrounding a seamount in
the middle of the Bussol’ Strait. They examine the spatial and temporal
variability of internal tides and associated turbulent mixing,
and present evidence of diurnal topographically trapped wave
propagation. Strong diapycnal mixing and turbulent dissipation
occur in the deep layers. They partly reproduced these observed
features with a numerical model, but they report that the observed
diapycnal mixing is significantly weaker than the numerically predicted
mixing. Itoh et al. (2014b) report direct observations made
over the course of one day on the Pacific side of the Urup Strait sill.
They observed the generation of large-amplitude internal waves
(LAIWs) and strong mixing and use numerical modeling to reveal
the structure and generation pattern of the LAIWs. Their findings
suggest that barotropic tidal energy, which varies with a diurnal
frequency, is converted into LAIWs through the excitation of topographically
trapped waves with hydraulically supercritical velocity
near the top of the sill, and that the LAIWs are responsible for the
extremely strong mixing observed on the flanks of shallow sills
between some Kuril Islands. Yagi et al. (2014) re-evaluated the vertical
and horizontal distributions of turbulence intensity across the
Bussol’ Strait by applying a new interpolation method (Yagi and
Yasuda, 2013) to discrete estimates based on the Thorpe mixing
length. They report that significant part of the turbulence intensity
are explained by vertical shear of mean and diurnal tidal currents
caused by diurnal topographically trapped waves around a seamount
in the middle of the strait and above the slopes at the eastern
and western ends of the strait. The improved vertical
turbulence profile suggest that Okhotsk Sea Mode Water, the core
of NPIW, thins as it flows out through the Bussol’ Strait from the
Sea of Okhotsk to the North Pacific due to diapycnal mixing.
report the results of direct detailed hydrographic,
velocity, and microstructural observations made over a
period of about 24 h at three stations surrounding a seamount in
the middle of the Bussol’ Strait. They examine the spatial and temporal
variability of internal tides and associated turbulent mixing,
and present evidence of diurnal topographically trapped wave
propagation. Strong diapycnal mixing and turbulent dissipation
occur in the deep layers. They partly reproduced these observed
features with a numerical model, but they report that the observed
diapycnal mixing is significantly weaker than the numerically predicted
mixing. Itoh et al. (2014b) report direct observations made
over the course of one day on the Pacific side of the Urup Strait sill.
They observed the generation of large-amplitude internal waves
(LAIWs) and strong mixing and use numerical modeling to reveal
the structure and generation pattern of the LAIWs. Their findings
suggest that barotropic tidal energy, which varies with a diurnal
frequency, is converted into LAIWs through the excitation of topographically
trapped waves with hydraulically supercritical velocity
near the top of the sill, and that the LAIWs are responsible for the
extremely strong mixing observed on the flanks of shallow sills
between some Kuril Islands. Yagi et al. (2014) re-evaluated the vertical
and horizontal distributions of turbulence intensity across the
Bussol’ Strait by applying a new interpolation method (Yagi and
Yasuda, 2013) to discrete estimates based on the Thorpe mixing
length. They report that significant part of the turbulence intensity
are explained by vertical shear of mean and diurnal tidal currents
caused by diurnal topographically trapped waves around a seamount
in the middle of the strait and above the slopes at the eastern
and western ends of the strait. The improved vertical
turbulence profile suggest that Okhotsk Sea Mode Water, the core
of NPIW, thins as it flows out through the Bussol’ Strait from the
Sea of Okhotsk to the North Pacific due to diapycnal mixing.
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