동해 독도 주변해역에서의 혼합

Title
동해 독도 주변해역에서의 혼합
Alternative Title
Mixing around Dok Island (Dokdo) in the East Sea
Author(s)
장성태; 신창웅; 민홍식; 이재학
KIOST Author(s)
Shin, Chang Woong(신창웅)Lee, Jae Hak(이재학)
Publication Year
2007-06-13
Abstract
Dok Island (Dokdo) is located at the northeastern corner of Ulleung Basin in the East Sea. The hydrography around Dokdo is very complex influenced by warm waters from the meandering of the East Korean Warm Current (EKWC), cold waters from the Northern Korean Cold Water (NKCW), the size and location of the Ulleung Warm Eddy (UWE) and variability of the subpolar front. In November 2006, the Korea Ocean Research and Development Institute (KORDI) conducted hydrographic survey around Dokdo using the R/V Eardo. Figure 2 shows horizontal distributions of temperature at 4 m and 100 m depths, respectively. Surface temperature is lower near the coast of Dokdo than the outer area, which is an indication of the island mixing. Temperature at 100 m is higher in the southwest probably due to the Tsushima Warm Current (TWC) carrying warm and saline water.Shown in Fig. 3 are vertical distributions of potential temperature, salinity and dissolved oxygen (DO) along Line A from the west of Dokdo to the east. The East Sea Intermediate Water (ESIW) below the TWC, which affects the hydrographic condition in the upper layer around Dokdo is observed at 200 ~ 300 m with low salinity and high dissolved oxygen. It is noticeable that temperature and salinity at the stations in the vicinity of Dokdo is further lowered by about 1.0 °C and 0.1 psu, respectively. The dissipation rate of turbulent kinetic energy (ε) is fundamental to understand of mixing in the ocean and is used to estimate the diapycnal eddy diffusivity (Kz). Microstructure profiling measurements were carried out at 10 stations between Ulleungdo and Dokdo in March 8-10, 2007. The vertical distribution of ε measured by a microstructure profiler (TurboMAP) is shown in Fig. 4b excluding the upper 10 m. The highest level of ε ( W/kg) was observed near Dokdo associated with shear instabilities. Since the stability in the thermocline is very strong, it takes much more energy to displace a particle of water. It is characterize
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30453
Bibliographic Citation
Proceedings of 3rd KORDI-POI workshop for the East Sea, pp.14 - 17, 2007
Publisher
Study froup for the East Sea monotoring between KORDI and POI
Type
Conference
Language
English
Publisher
Study froup for the East Sea monotoring between KORDI and POI
Related Researcher
Research Interests

Ocean Circulation,Watermass Analysis,Climate Change,해양순환,수괴분석,기후변화

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