Variability of the Dokdo Abyssal Current observed in the Ulleung Interplain Gap of the East/Japan Sea

作     者：KIM Yun-Bae CHANG Kyung-Il PARK Jae-Hun PARK Jong Jin 

作者机构：East Sea Research Institute Korea Institute of Ocean Science and Technology Research Institute of Oceanography School of Earth and Environmental Sciences Seoul National University Ocean Science Research Department Korea Institute of Ocean Science and Technology Department of Oceanography Kyungpook National University 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2013年第32卷第1期

页      面：12-23页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 070701[理学-物理海洋学] 

基　　金：The Ministry of Land, Transport and Maritime Affairs of Korean Govenment as part of the EAST-I (East Asian Seas Time-series,East/Japan Sea) and OCCAPA (Ocean Chimate Change-Analyses, Projections and Adaptation), through KIOST Project under contract No. PE98742 as part of the Development of Technology for CO2 Marine Geological Storage project under contract No. PMS246B 

主　　题：East/Iapan Sea Ulleung Interplain Gap Deep currents Topographic Ressby waves 

摘      要：Subinertial fluctuation of a strong northward deep current, which is referred to the Dokdo Abyssal Current （DAC） by Chang et al. （2009）, is investigated from current records for about 16.5 and 8.0 months in the Ulle- ung Interplain Gap of the East/lapan 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 theo- retical 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 cur- rent fluctuations with periods of near 10 d and 20 d were accompanied by warm events in the upper layer resulting from eddying processes and/or meandering of the Tsushima Warm Current.