Variability of the Dokdo Abyssal Current observed in the Ulleung Interplain Gap of the East/Japan Sea |
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| Authors: | KIM Yun-Bae CHANG Kyung-Il PARK Jae-Hun and PARK Jong Jin |
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| Institution: | 1.East Sea Research Institute, Korea Institute of Ocean Science and Technology, Uljin 767-813, Republic of Korea2.Research Institute of Oceanography, School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Republic of Korea3.Ocean Science Research Department, Korea Institute of Ocean Science and Technology, Ansan 426-744, Republic of Korea4.Department of Oceanography, Kyungpook National University, Sangju 742-711, Republic of Korea |
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| Abstract: | Subinertial fluctuation of a strong northward deep current, which is referred to the Dokdo Abyssal Current (DAC) by Chang et al. (2009), is investigated fromcurrent records for about 16.5 and 8.0months in the Ulleung Interplain Gap of the East/Japan Sea. 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 d. The DAC variability near 10 d and 20 d is reasonably consistent with the linear theory of topographic Rossby waves (TRWs) in the following aspects: (1) The motion is columnar and bottom-intensified; (2) the theoretical cutoff frequency is similar to the observation; (3) The observation-based angles of the wavenumber vector are in good agreement with the theoretical ones. The wavelengths of the TRWs with periods of near 10 d and 20 d near Dokdo are significantly shorter than those with similar timescales in the open oceans (100–250 km). It is primarily due to the weak stratification below 300 m in the East Sea. The deep current fluctuations with periods of near 10 d and 20 d were accompanied by warm events in the upper layer resulting from eddying processes and/ormeandering of the Tsushima Warm Current. |
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| Keywords: | East/Japan Sea Ulleung Interplain Gap Deep currents Topographic Rossby waves |
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