Editorial Type:
Article
Article Type:
Research Article

Vertical Viscosity Coefficient Increased for High-Resolution Modeling of the Tsushima/Korea Strait

Naoki Hirose aResearch Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan

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Tianran Liu aResearch Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan

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Katsumi Takayama aResearch Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan

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Katsuto Uehara aResearch Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan

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Takeshi Taneda bFisheries Resources Institute, Japan Fisheries Research and Education Agency, Nagasaki, Japan

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Young Ho Kim cDepartment of Oceanography, Pukyong National University, Busan, South Korea

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Online Publication:
24 Jun 2021
Print Publication:
01 Jun 2021
DOI:
https://doi.org/10.1175/JTECH-D-20-0156.1
Page(s):
1205–1215
Restricted access

Abstract

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 on the order of 100 cm2 s−1, while tracer diffusivity estimates are on the order of 0.1 cm2 s−1. 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.

© 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Naoki Hirose, hirose@riam.kyushu-u.ac.jp

Abstract

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 on the order of 100 cm2 s−1, while tracer diffusivity estimates are on the order of 0.1 cm2 s−1. 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.

© 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Naoki Hirose, hirose@riam.kyushu-u.ac.jp
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Journal of Atmospheric and Oceanic Technology

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