2006년 하계 울진 연안 해류의 변동성
Variability of the Coastal Current off Uljin in Summer 2006
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In an effort to investigate the structure and variability of the coastal current in the East Sea, a moored ADCP observation was conducted off Uljin from late May to mid-October 2006. Owing to the transition of season from summer to autumn, the features of the current and wind can be divided into two parts. Until mid-August (Part-I), a southward flow is dominant at all depths with a mean alongshore velocity of 4.2~8.9 cm/s but northward winds are not strong enough to reverse the near-surface current. During Part-II, a strong northward current occurs frequently in the upper layer but winds are predominantly southward including two typhoons that have deep-reaching influence. Profile of mean velocity has three layers with a northward velocity embedded at 12~28 m depth. The near-surface current of Part-II significantly coheres with winds at 4-8 day periods with a phase lag of about 12 hours. The modal structure of the current obtained by EOF analysis is: (1) Mode-1, having 83.6% of total variance, represents the current in the same direction at all depths corresponding to the southward North Korean Cold Current (NKCC). (2) Mode-2 (11.7%) reveals a two-layer structure that can be explained by the northward East Korean Warm Current (EKWC) in the upper layer and NKCC in the lower. (3) Mode-3 (2.6%) has three layers, in which the EKWC is reversed near the surface by opposing winds. This mode is particularly similar to the mean velocity profile of Part-II.
Abstract
In an effort to investigate the structure and variability of the coastal current in the East Sea, a moored ADCP observation was conducted off Uljin from late May to mid-October 2006. Owing to the transition of season from summer to autumn, the features of the current and wind can be divided into two parts. Until mid-August (Part-I), a southward flow is dominant at all depths with a mean alongshore velocity of 4.2~8.9 cm/s but northward winds are not strong enough to reverse the near-surface current. During Part-II, a strong northward current occurs frequently in the upper layer but winds are predominantly southward including two typhoons that have deep-reaching influence. Profile of mean velocity has three layers with a northward velocity embedded at 12~28 m depth. The near-surface current of Part-II significantly coheres with winds at 4-8 day periods with a phase lag of about 12 hours. The modal structure of the current obtained by EOF analysis is: (1) Mode-1, having 83.6% of total variance, represents the current in the same direction at all depths corresponding to the southward North Korean Cold Current (NKCC). (2) Mode-2 (11.7%) reveals a two-layer structure that can be explained by the northward East Korean Warm Current (EKWC) in the upper layer and NKCC in the lower. (3) Mode-3 (2.6%) has three layers, in which the EKWC is reversed near the surface by opposing winds. This mode is particularly similar to the mean velocity profile of Part-II.
참고문헌 (24)
- 김영호, "동해 재분석 자료에 나타난 북한한류의 계절 및 경년변동성", Ocean and Polar Research, 30(1), pp.21~31 (2008), 한국해양과학기술원
- 김일남, "하계 대한해협 저층냉수의 물리·화학적인 특성 및 기원", Ocean and Polar Research, 26(4), pp.595~606 (2004), 한국해양과학기술원
- 김철호, "한국 동해안에 출현하는 냉수괴의 특성과 기원", J Oceanol Soc Korea, 18(1), pp.73~83 (1983)
- 나정열, "한반도 근해의 해류 및 해수특성 – 한국 동해의 수온의 수직구조", Bull Korean Fish Soc, 24(4), pp.215~228 (1991)
- 박경애, "해양관측을 통해 획득된 과학적 지식에 기반한 과학교과서 동해 해류도", 바다, 18(4), pp.234~265 (2013), 한국해양학회
- 박청길, "한국 동해안 냉수괴의 해양화학적 고찰", Bull Korean Fish Soc, 11(2), pp.49~54 (1978)
- An HS, "The fluctuation of the thermal front in the southeastern area off Korea", J Oceanol Soc Korea, 17(2), pp.33~40 (1982)
- Hong C-H, "The northern boundary of the Tsushima Current and its fluctuations", J Oceanol Soc Korea, 18(1), pp.1~9 (1983)
- Kawabe M, "Branching of the Tsushima current in the Japan Sea, Part I. Data analysis", J Oceanogr Soc Japan, 38, pp.95~107 (1982)
- Kim K, "Branching of the Tsushima current in 1981-83", Prog Oceanogr, 17, pp.265~276 (1986)
- Lee D-K, "The energetic surface circulation patterns of the Japan", East Sea, 2005, pp.52, 1547~1563
- Lee D-K, "Surface circulation in the southwestern Japan", East Sea as observed from drifters and sea surface height, 2010, pp.57, 1222~1232
- Lee JC, "Variations of sea level and sea surface temperature associated with wind-induced upwelling in the southeast coast of Korea in summer", J Oceanol Soc Korea, 18(2), pp.6~19 (1983)
- Lee JC, "Structure of upwelling off the southeast coast of Korea in summer", J Oceanol Soc Korea, 20(3), pp.149~160 (1985)
- JAECHULLEE, "Observations of Coastal Upwelling at Ulsan in summer 1997", Ocean Science Journal, 38(3), pp.4~134 (2003), 한국해양과학기술원
- 이동섭, "Chemical Imprints of the Upwelled Waters off the Coast of the Southern East Sea of Korea", Ocean Science Journal, 38(3), pp.101~110 (2003), 한국해양과학기술원
- Lie H-J, "Summertime southward current along the east coast of Korea", J Oceanogr Soc Korea, 20(2), pp.22~27 (1985)
- Lie H-J, "Observation of southeastward deep current off the east coast of Korea", J Oceanogr Soc Korea, 24, pp.63~68 (1989)
- Martin S, "The southern flux of sea ice in the Tatarsky Strait, Japan Sea and the generation of the Liman Current", J Mar Res, 56, pp.141~155 (1998)
- Park K-A, "Relationship between satellite-observed cold water along the Primorye coast and sea ice in the East Sea (the Sea of Japan)", Geophys Res Lett, 33, pp.L10602~ (2006)[DOI]
- Yoon J-H, "Numerical experiment on the circulation in the Japan Sea, Part I. Formation of the East Korean Warm Current", J Oceanogr Soc Japan, 38, pp.43~51 (1982)
- Yoon J-H, "The formation and circulation of the intermediate water in the Japan Sea", J Oceanogr, 58, pp.197~211 (2002)
- Yoon J-H, "Review on the seasonal variation of the surface circulation in the Japan", East Sea, 2009, pp.78, 226~236
- Yun J-Y, "Spatial and temporal variability of the North Korean Cold Water leading to the near-bottom cold water intrusion in Korea Strait", Prog Oceanogr, 60, pp.99~131 (2004)