| KIM Yun-Bae,CHANG Kyung-Il,PARK Jae-Hun,PARK Jong Jin. 2013. Variability of the Dokdo Abyssal Current observed in the Ulleung Interplain Gap of the East/Japan Sea. Acta Oceanologica Sinica, 32(1):12－23 |
| Variability of the Dokdo Abyssal Current observed in the Ulleung Interplain Gap of the East/Japan Sea |
| Variability of the Dokdo Abyssal Current observed in the Ulleung Interplain Gap of the East/Japan Sea |
| Received:January 03, 2012 Revised:October 09, 2012 |
| DOI：10.1007/s13131-013-0263-y |
| Key words:East/Japan Sea Ulleung Interplain Gap Deep currents Topographic Rossby waves |
| 中文关键词: East/Japan Sea Ulleung Interplain Gap Deep currents Topographic Rossby waves |
| 基金项目: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, and as part of the Development of Technology for CO2 Marine Geological Storage project under contract No. PMS246B. |
| Author Name | Affiliation | E-mail | | KIM Yun-Bae | East Sea Research Institute, Korea Institute of Ocean Science and Technology, Uljin 767-813, Republic of Korea | | | CHANG Kyung-Il | Research Institute of Oceanography, School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Republic of Korea | | | PARK Jae-Hun | Ocean Science Research Department, Korea Institute of Ocean Science and Technology, Ansan 426-744, Republic of Korea | jjpark@knu.ac.kr | | PARK Jong Jin | 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 from current records for about 16.5 and 8.0 months 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/or meandering of the Tsushima Warm Current. |
| 中文摘要: |
| 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 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/or meandering of the Tsushima Warm Current. |
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