Seasonal Variability in Middepth Gyral Circulation Patterns in the Central East/Japan Sea as Revealed by Long-Term Argo Data SCIE SCOPUS

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Title
Seasonal Variability in Middepth Gyral Circulation Patterns in the Central East/Japan Sea as Revealed by Long-Term Argo Data
Author(s)
Kang, Sok Kuh; Seung, Young Ho; Park, Jong Jin; Park, Jae-Hun; Lee, Jae Hak; Kim, Eun Jin; Kim, Young Ho; Suk, Moon-Sik
KIOST Author(s)
Lee, Jae Hak(이재학)Kim, Eun Jin(김은진)
Alternative Author(s)
강석구; 박재훈; 이재학; 김은진; 김영호; 석문식
Publication Year
2016-03
Abstract
Trajectories of Argo floats deployed in the East/Japan Sea from 2001 to 2014 reveal that the middepth gyral circulation pattern of the Japan basin, the central part of the East/Japan Sea, undergoes a seasonal variation. The middepth circulation of the Japan basin is found to be characterized usually by the gyres trapped to the east of the Bogorov Rise (E-gyres) and those extending farther westward into the whole basin (BW-gyres). The E-gyre trajectories are generally associated with the turning of the floats toward deeper regions off the isobaths. This occurs in winter either on the northern or eastern side of the eastern Japan basin. It seems that the upstream part of the otherwise BW-gyre is subject to a strong negative wind stress curl in winter, and there the circulating water columns are driven toward the deeper region, thus triggering the formation of the E-gyre. The topographic effect associated with the Bogorov Rise seems to interfere thereafter in the process of determining the passage of the E-gyre. Otherwise, the water columns continue to flow along the isobaths, hence maintaining the BW-gyre. To the knowledge of the authors, this is the first observational evidence of seasonal variability in the middepth gyral circulation pattern in the East/Japan Sea. It suggests that oceanic middepth circulation, usually known to be quasi steady or slowly varying on climatological time scales, might also undergo a significant seasonal variation as it does in the East/Japan Sea.
ISSN
0022-3670
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2214
DOI
10.1175/JPO-D-15-0157.1
Bibliographic Citation
JOURNAL OF PHYSICAL OCEANOGRAPHY, v.46, no.3, pp.937 - 946, 2016
Publisher
AMER METEOROLOGICAL SOC
Subject
JAPAN SEA; INTERMEDIATE WATER; DEEP CURRENTS; OCEAN
Keywords
Observational techniques and algorithms; Ocean dynamics; Trajectories; Circulation/ Dynamics; Profilers, oceanic; Seasonal variability; Ocean circulation; Variability; Wind stress
Type
Article
Language
English
Document Type
Article
Publisher
AMER METEOROLOGICAL SOC
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