Numerical simulation of the abrupt occurrence of strong current in the southeastern Japan Sea

Hirose, Nobuyoshi; Kumaki, Yutaka; Kaneda, Atsushi; Ayukawa, Kouta; Okei, Noriyuki; Ikeda, Shigerô; Igeta, Yosuke; Watanabe, Teruhisa

doi:10.1016/j.csr.2016.07.005

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…Nonslip and no-flux conditions are imposed to the sidewall boundary. The open boundary conditions (OBC) are sequentially provided by the parent model (DR_M), which is constructed by Hirose et al (2013), at the four sides of the calculation domain and at 131830 0 E, northeast of Kyushu Island. One-way nesting is employed for the sea level, temperature, salinity, and velocity components at 1-h interval.…”

Section: Numerical Modelmentioning

confidence: 99%

“…However, we found negative bias for the subsurface layers in the DR_M output data. The long-term temperature difference of the assimilation products between Four-dimensional variational Ocean Reanalysis (FORA; Usui et al 2017) and DR_M (Hirose et al 2013) is shown in Fig. 2.…”

Section: Numerical Modelmentioning

confidence: 99%

“…A more serious problem may be their computational demand, which easily exceeds 100 times of a forward model. On the other hand, Green's functions can be readily applied to optimizing the parameters of ocean general circulation models (e.g., Menemenlis et al 2005;Hirose 2011). This simple method is adopted and downscaled to coastal changes, as discussed in the later section of the present study.…”

Section: Introductionmentioning

confidence: 99%

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Vertical viscosity coefficient increased for high-resolution modeling of the Tsushima/Korea Strait

Hirose

Liu

Takayama

et al. 2021

Journal of Atmospheric and Oceanic Technology

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This study clarifies the necessity of an extraordinary large coefficient of vertical viscosity for dynamical ocean modeling in a shallow and narrow strait with complex bathymetry. Sensitivity experiments and objective analyses imply that background momentum viscosity is at the order of 100 cm2/s, while tracer diffusivity estimates are on the order of 0.1 cm2/s. The physical interpretation of these estimates is also discussed in the last part of this paper. To obtain reliable solutions, this study introduces cyclic application of the dynamical response to each parameter to minimize the number of long-term sensitivity experiments. The recycling Green’s function method yields weaker bottom friction and enhanced latent heat flux simultaneously with the increased viscosity in high-resolution modeling of the Tsushima/Korea Strait.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vertical viscosity coefficient increased for high-resolution modeling of the Tsushima/Korea Strait

Hirose

Liu

Takayama

et al. 2021

Journal of Atmospheric and Oceanic Technology

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show abstract

“…The model results showed that the "before" current was generated by continuous strong easterly winds (Kumaki et al, 2012), and the "after" one was caused by the backwash from waves breaking in the swash zone (Igeta et al, 2007). While both previous models considered only wind stress as forcing, Hirose et al (2016) developed a three-dimensional coastal ocean model (called DR_C) with a horizontal resolution of 1.5 km considering a realistic open boundary condition obtained from a regional data assimilation system (Hirose et al, 2013), surface heat flux, wind stress, and river discharges. The polygon in Fig.…”

Section: Introductionmentioning

confidence: 98%

Relative contributions of external forcing factors to circulation and hydrographic properties in a micro-tidal bay

Yoon

Kasai

2017

Estuarine, Coastal and Shelf Science

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The dominant external forcing factors influencing estuarine circulation differ among coastal environments. A three-dimensional regional circulation model was developed to estimate external influence indices and relative contributions of external forcing factors such as external oceanic forcing, surface heat flux, wind stress, and river discharge to circulation and hydrographic properties in Tango Bay, Japan. Model results show that in Tango Bay, where the Tsushima Warm Current passes offshore of the bay, under conditions of strong seasonal winds and river discharge, the water temperature and salinity are strongly influenced by surface heat flux and river discharge in the surface layer, respectively, while in the middle and bottom layers both are mainly controlled by open boundary conditions. The estuarine 2 circulation is comparably influenced by all external forcing factors, the strong current, surface heat flux, wind stress, and river discharge. However, the influence degree of each forcing factor varies with temporal variations in external forcing factors as: the influence of open boundary conditions is higher in spring and early summer when the stronger current passes offshore of the bay, that of surface heat flux reflects the absolute value of surface heat flux, that of wind stress is higher in late fall and winter due to strong seasonal winds, and that of river discharge is higher in early spring due to snow-melting and summer and early fall due to flood events.

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Sudden strong current generated by an eddy in the eastern part of Wakasa Bay, Japan

et al. 2016

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Numerical simulation of the abrupt occurrence of strong current in the southeastern Japan Sea

Cited by 10 publications

References 19 publications

Vertical viscosity coefficient increased for high-resolution modeling of the Tsushima/Korea Strait

Vertical viscosity coefficient increased for high-resolution modeling of the Tsushima/Korea Strait

Relative contributions of external forcing factors to circulation and hydrographic properties in a micro-tidal bay

Sudden strong current generated by an eddy in the eastern part of Wakasa Bay, Japan

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