Bottom-intensified low-frequency deep current variability around Ulleung Interplain Gap of the southwestern East Sea

Title
Bottom-intensified low-frequency deep current variability around Ulleung Interplain Gap of the southwestern East Sea
Author(s)
김윤배; 장경일; 이재학
KIOST Author(s)
Lee, Jae Hak(이재학)
Alternative Author(s)
김윤배; 이재학
Publication Year
2012-11-06
Abstract
Moored current measurements were made over steep bottom slope around Ulleung Interplain Gap (UIG) in the southwestern East Sea. The UIG serves as a main passageway for the exchange of deep waters between the Ulleung Basin and the Japan Basin. Deep circulation in the UIG is characterized by a two-way flow system with relatively weak southward flows directed into the UB over about two-thirds of the western UIG and strong, quasi-persistent and narrow compensating northward outflows with the strongest flow against the eastern wall near Dokdo (Chang et al., 2009).Because of persistency and strength of the northward flow in the eastern UIG, Chang et al. (2009) named this flow the Dokdo Abyssal Current (DAC). The current below 300 m is bottom-intensified and has nearly depth-independent flow. Near bottom, the spectral peaks of the current were found near 10, 20, and 60 days. The DAC variability near 10 and 20 days are reasonably consistent with the linear theory of Topographic Rossby Waves (TRWs) in following aspects; 1) The motion is columnar and bottom-intensified, 2) The theoretical cutoff frequency is similar to the observation, and 3) The observation-based angles of the wavenumber vector are in good agreement with the theoretical ones.Basin. Deep circulation in the UIG is characterized by a two-way flow system with relatively weak southward flows directed into the UB over about two-thirds of the western UIG and strong, quasi-persistent and narrow compensating northward outflows with the strongest flow against the eastern wall near Dokdo (Chang et al., 2009).Because of persistency and strength of the northward flow in the eastern UIG, Chang et al. (2009) named this flow the Dokdo Abyssal Current (DAC). The current below 300 m is bottom-intensified and has nearly depth-independent flow. Near bottom, the spectral peaks of the current were found near 10, 20, and 60 days. The DAC variability near 10 and 20 days are reasonably consisten
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/27417
Bibliographic Citation
International workshop-Marginal Seas in Change: the East Sea and the Mediterranean Case, pp.1, 2012
Publisher
Korean
Type
Conference
Language
English
Publisher
Korean
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