Analysis of submesoscale eddies around the Tsushima island in the Korea-Tsushima strait using km-scale ocean circulation model outputs = 킬로미터 규모의 해수순환모델 자료를 이용한 대한해협 내 대마도 주변의 아중규모 와동류 분석

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We investigated the general circulation around the Korea-Tsushima Strait and submesoscale eddies [O(1–10) km diameter] persistently generated behind the Tsushima Island, based on hourly and 2-km spatial resolution velocity data of the global submesoscale numerical simulation outputs (MITgcm llc4320). As the cross-correlation coefficients between subsurface currents and surface currents was over 0.7, we employed surface current data to analyze the island eddy. $M_2, K_1, O_1$ and $S_2$ are four dominant tidal frequencies around the surface of the Korea-Tsushima Strait. We detected where the surface vorticity changed their signs. Furthermore, we identified the spatial and temporal structures of the surface circulation associated with island wakes using Empirical Orthogonal Function (EOF) to check the island eddy generation period. We established that the generation frequency of the surface island wakes was within a range from 0.2 to 0.5 cycles per day (2–5-day period). The principal components in the 2nd mode in the EOF analysis revealed similar periodicity. The cross-correlation coefficient between the vorticity sign change line, and the principal components in the 2nd mode was 0.6; they had 0.8 coherence from approximately 0.2 to 0.5 cycles per day frequency. Also, the vorticity generation frequency had seasonality, and eddies were more frequently generated from April to November.
Advisors
Kim, Sung Yongresearcher김성용researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 2020.2,[v, 35 p. :]

Keywords

Submesoscale eddy▼aEmpirical orthogonal function▼aKorea-Tsushima Strait▼aIsland wakes▼aTsushima Island; 아중규모 와동류▼a경험적 직교 함수▼a대한 해협▼a섬 뒤의 와류▼a대마도

URI
http://hdl.handle.net/10203/284073
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=910885&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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