Vertical structure of low-frequency currents in the southwestern East Sea (Sea of Japan) SCIE SCOPUS

Cited 4 time in WEB OF SCIENCE Cited 6 time in Scopus
Title
Vertical structure of low-frequency currents in the southwestern East Sea (Sea of Japan)
Author(s)
Kim, Yun-Bae; Chang, Kyung-Il; Kim, Kuh; Park, Jae-Hun; Lee, Jae-Hak
KIOST Author(s)
Lee, Jae Hak(이재학)
Publication Year
2009-04
Abstract
The vertical structure of low-frequency flows in the central Ulleung Interplain Gap of the southwestern East Sea (Sea of Japan) is analyzed based on full-depth current measurement during November 2002-April 2004. Record-length mean flows are directed toward the Ulleung Basin (Tsushima Basin) throughout the entire water column. Upper current variability above the permanent thermocline with a dominant period of about 50-60 days is shown to be closely related to the displacement of an anticyclonic warm eddy associated with the westward meander of the Offshore Branch. Fluctuations of deep currents below the permanent thermocline have a dominant period of about 40 days. Coherence between the current near the seabed and shallower depths is statistically significant up to 360 m for a period range between 15 and 100 days, but less significantly correlated with currents in the upper 200 m. Data from the densely equipped mooring line reveal that mean and eddy kinetic energies are minima at 1000 m, where isotherm slopes are also relatively flat. Empirical orthogonal function (EOF) analyses suggest that more than 79% of total variances of upper and deep currents can be explained by their respective first EOF mode characterized by nearly depth-independent eigenvectors. Spectral and EOF analyses of observed currents suggest that most of the deep current variability is not directly related to local upper current variability during the observation period.
ISSN
0916-8370
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4309
DOI
10.1007/s10872-009-0024-x
Bibliographic Citation
JOURNAL OF OCEANOGRAPHY, v.65, no.2, pp.259 - 271, 2009
Publisher
SPRINGER
Subject
EAST/JAPAN SEA; ULLEUNG BASIN; DEEP FLOW; CIRCULATION; VARIABILITY; FIELD; EDDY
Keywords
Sea of Japan; moored current observation; low-frequency current variability; vertical structure of current
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGER
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