Tidally Driven Mixing "Hot Spot" at the Entrance of the Japan/East Sea SCIE SCOPUS

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Title
Tidally Driven Mixing "Hot Spot" at the Entrance of the Japan/East Sea
Author(s)
Wijesekera, Hemantha W.; Jarosz, Ewa; Wang, David W.; Luecke, Conrad A.; Teague, William J.; Chang, Kyung-Il; Lee, Jae Hak; Nam, SungHyun; Min, Hong Sik; Lee, Kyung Jae
KIOST Author(s)
Lee, Kyung Jae(이경재)
Alternative Author(s)
민홍식; 이경재
Publication Year
2022-09
Abstract
Mixing at the southwestern boundary of the Ulleung Basin (UB) in the Japan/East Sea was examined using combined ship-based, moored, and quasi-autonomous observations. These observations revealed strong tidal currents, high-frequency internal wave packets, and energetic turbulence over the sill connecting the Korea/Tsushima Strait and the UB, especially when a supercritical flow becomes subcritical over the sill. In addition, strong velocity shear associated with the semidiurnal baroclinic tide was found near the bottom, where the bathymetry slope was critical to the semidiurnal tide. Large temperature fluctuations were observed during the subcritical phase of the flow, as hydraulically controlled flow generated internal-wave packets and energetic turbulence with a turbulent-kinetic-energy dissipation rate of similar to $\sim $10(-4) Wkg(-1), and a diapycnal diffusivity of similar to $\sim $10(-2) m(2)s(-1). Our analysis suggests that the sill is a hot spot of mixing, which in turn can play an important role in the Japan/East Sea circulation.
ISSN
0094-8276
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43213
DOI
10.1029/2022GL100315
Bibliographic Citation
Geophysical Research Letters, v.49, no.18, 2022
Publisher
American Geophysical Union
Keywords
turbulence; mixing; tides; Sea of Japan; East Sea; Korea Strait
Type
Article
Language
English
Document Type
Article
Publisher
American Geophysical Union
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