The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Some Dynamical Issues about the Tsushima Warm Current based on Bibliographical Review

서지학적으로 본 대마난류의 몇 가지 역학적 쟁점들

  • Received : 2019.06.25
  • Accepted : 2019.08.19
  • Published : 2019.08.31
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Abstract

Some dynamical issues about the Tsushima Warm Current (TWC) are reviewed and checked for the remaining unresolved problems, focusing on the formation of the TWC, seasonal variation of its volume transport and its branching in the East Sea. The TWC is a part of the North Pacific (NP) subtropical gyre driven by the NP global wind system. However, the quantitative amount of volume transport is sensitive to friction, basin geometry, barrier effect and so on. Among many causes suggested by many scientists, subpolar winds are found to be most closely related with the seasonal variation of TWC volume transport. However, more studies relating the latter not only to the subpolar winds but also to those including the subtropical winds seem to be required. The branching of the TWC has been known to be due to the western intensification for the East Korean Warm Current (EKWC) and to the bottom trapping for the Nearshore Branch. Since the former hypothesis is problematic in explaining the seasonal variation of the EKWC, other candidate mechanisms may need to be considered.

지금까지의 연구 결과를 토대로 하여 대마난류의 순환역학에 관한 몇 가지 쟁점들을 정리해 보고 향 후 해결할 문제점들을 짚어보는 기회로 삼고자 하였다. 주요 관심 사항은 대마난류의 형성, 그 수송량의 계절변동 및 동해 내부에서의 분지 현상이다. 대마난류는 북태평양 아열대순환의 일부로서 북태평양 전지구적 바람장에 의해 형성된다. 그러나 마찰, 만의 지형, 장벽효과 등에 따라 그 수송량은 민감하게 변한다. 수송량의 계절변동에 대해서는 여러 학자들에 의해 많은 요인들이 제시되어 왔으나 아한대 바람장이 이와 가장 밀접히 연관되어 있는 것으로 밝혀졌다. 그러나 향후, 아한대 바람장 뿐만 아니라 아열대 바람장까지를 포함한 북태평양 전체 바람장과의 관계를 보여줄 수 있는 연구가 필요해 보인다. 대마난류의 두 분지인 동한난류와 일본연안류의 형성 기작으로서 그동안 서안강화 현상과 해저지형 효과가 가장 유력하게 제시되어 왔다. 그러나 서안강화는 동한난류의 계절변동을 설명할 수 없다는 문제점을 갖고 있음으로 이를 대체할 다른 기작에 대한 연구가 필요하다고 사료된다.

Keywords

References

  1. Arruda, W.Z., D. Nof and J.J. O'Brien, 2004. Does the Ulleung eddy owes its existence to ${\beta}$ and nonlinearity? Deep Sea Res. I, 51: 2073-2090. https://doi.org/10.1016/j.dsr.2004.07.014
  2. Bleck, R. and L.T. Smith, 1990. A wind-driven isopycnic coordinate model of the north and equatorial Atlantic Ocean 1. Model development and supporting experiments. J. Phys. Oceanogr., 95: 3273-3285.
  3. Chang K.I., C.I. Zhang, C. Park, D.J. Kang, S.J. Ju, S.H. Lee and M. Wimbush, 2016. Oceanography of the East Sea (Japan Sea). Springer, 460 pp.
  4. Cho, Y.K. and K. Kim, 2000. Branching mechanism of the Tsushima Current in the Korea Strait. J. Phys. Oceanogr., 30: 2788-2797. https://doi.org/10.1175/1520-0485(2000)030<2788:BMOTTC>2.0.CO;2
  5. Cho, Y.K., G.H. Seo, B.J. Choi, S. Kim, Y.G. Kim, Y.H. Youn and E.P. Dever, 2009. Connectivity among straits of the northwest Pacific marginal seas. J. Geophys. Res., 114, C06018, doi: 10.1029/ 2008JC005218.
  6. Cho, Y.K., G.H. Seo, C.S. Kim, B.J. Choi and D.C. Shaha, 2013. Role of wind stress in causing maximum transport through the Korea Strait in autumn. J. Mar. Syst., 115-116: 33-39, doi: 10.1016/ j. jmarsys. 2013.02.002.
  7. Choi, B.J., S.H. Cho, H.S. Jung, S.H. Lee, D.S. Byun and K. Kwon, 2018. Interannual variation of surface circulation in the Japan/East Sea due to external forcings and intrinsic variability. Ocean Sci. J., 53(1): 1-16. https://doi.org/10.1007/s12601-017-0058-8
  8. Fukamachi, Y., I. Tanaka, K.I. Ohshima, N. Ebuchi, G. Mizuta, H. Yoshida, S. Takayanagi and M. Wakatsuchi, 2008. Volume transport of the Soya Warm Current revealed by bottom-mounted ADCP and ocean-radar measurement. J. Oceanogr., 46: 85-392.
  9. Fukudome, K., J.H. Yoon, A. Ostrovskii and T. Takikawa, 2010. Seasonal volume transport variation in the Tsushima Warm Current through the Tsushima Straits from 10 years of ADCP observations. J. Oceanogr., 66: 539-551. https://doi.org/10.1007/s10872-010-0045-5
  10. Godfrey, J.S., 1989. A Sverdrup model of the depth-integrated flow for the world ocean allowing for island circulations. Geophys. Astrophys. Fluid Dyn., 45: 89-112. https://doi.org/10.1080/03091928908208894
  11. Hirose, N. and K. Fukudome, 2006. Monitoring the Tsushima Warm Current improves seasonal prediction of the regional snowfall. SOLA, 2: 61-63, doi: 10.2151/sola.2006-016.
  12. Kawabe, M., 1982. Branching of the Tsushima Current in the Japan Sea. Part II: Numerical experiment. J. Oceanogr. Soc. Japan, 38: 183-192. https://doi.org/10.1007/BF02111101
  13. Kida, S., B. Qiu, J. Yang and X. Lin, 2016. The annual cycle of the Japan Sea Throughflow. J. Phys. Oceanogr., 46: 23-39, doi: 10.101175/ JPO-D-15-0075.1
  14. Kim, Y.H. and H.S. Min, 2008. Seasonal and interannual variability of the North Korean Cold Current in the East Sea reanalysis data. Ocean and Polar Research, 30(1): 21-31. https://doi.org/10.4217/OPR.2008.30.1.021
  15. Kim, Y.J., 2007. A study on the Japan/East Sea oceanic circulation using an ultra-high resolution model. Ph.D. Thesis, Kyushu University, Fukuoka, 249 pp.
  16. Lee, D.K. and P. Niiler, 2005. The energetic surface circulation patterns of the Japan/East Sea. Deep Sea Res., Part II, 52: 1547-1563. https://doi.org/10.1016/j.dsr2.2003.08.008
  17. Lee, D.K. and P. Niiler, 2010. Surface circulation in the southwestern Japan/East Sea as observed from drifters and sea surface height. Deep Sea Res, Part I, 57: 1222-1232. https://doi.org/10.1016/j.dsr.2010.06.003
  18. Lyu, S.J. and K. Kim, 2003. Absolute transport from the sea level difference across the Korea Strait. Geophys. Res. Lett., 30: 1285, doi: 10.1029/2002GL016233.
  19. Lyu, S.J. and K. Kim, 2005. Subinertial to interannual transport variations in the Korea Strait and their possible mechanisms. J. Geophys. Res., 110, C12016, doi: 10.1029/2004JC002651.
  20. Ma, C., D. Wu, X. Lin, J. Yang and X. Ju, 2012. On the mechanism of seasonal variation of the Tsushima Warm Current. Cont. Shelf Res., 48: 1-7, doi: 10.1016/j.csr.2012.08.013.
  21. Minato, S. and R. Kimura, 1980. Volume transport of the western boundary current penetrating into a marginal sea. J. Oceanogr. Soc. Japan, 36: 185-195. https://doi.org/10.1007/BF02070331
  22. Moon, J.H., N. Hirose, J.H. Yoon and I.C. Pang, 2009. Effect of the along-strait wind on the volume transport through the Tsushima/Korea Strait in September. J. Oceanogr., 65: 17-29, doi: 10.1007/s10872-009-0002-3.
  23. Nishida, Y., I. Kanomata, I. Tanaka, S. Sato and S. Takahashi, 2003. Seasonal and interannual variations of the volume transport through the Tsugaru Strait. Umi no Kenkyu, 12: 487-499.
  24. Nof, D., 1993. The penetration of Kuroshio water into the Sea of Japan. J. Phys. Oceanogr., 23: 797-807. https://doi.org/10.1175/1520-0485(1993)023<0797:TPOKWI>2.0.CO;2
  25. Nof, D., 2000. Why much of the Atlantic circulation enters the Caribbean Sea and very little of the Pacific circulation enters the Sea of Japan. Prog. Oceanogr., 45: 39-67. https://doi.org/10.1016/S0079-6611(99)00050-6
  26. Ohshima, K.I., 1994. The flow system in the Japan Sea caused by a sealeveldifferencethroughshallowstraits. J. Geophys. Res., 99: 9925-9940. https://doi.org/10.1029/94JC00170
  27. Onishi, M. and K. Ohtani, 1997. Volume transport of the Tsushima Warm Current, west of Tsugaru Strait bifurcation area. J. Oceanogr., 53: 27-34, doi: 10.1007/BF02700746.
  28. Ou, H.W., 2001. A model of buoyant throughflow: with application to branching of the Tsushima Current. J. Phys. Oceanogr., 31: 115-126. https://doi.org/10.1175/1520-0485(2001)031<0115:AMOBTW>2.0.CO;2
  29. Park, J. E., S.Y. Kim, B.J. Choi and D.S. Byun, 2019. Estimation of mean surface current and curent variability in the East Sea using surface drifter data from 1991 to 2017. J. Kor. Soc. Oceanogr., 24(2) : 208-225.
  30. Seo, H., Y.O. Kwon and J.J. Park, 2014. On the effect of the East/ Japan Sea SST variability on the North Pacific atmospheric circulation in a regional climate model. J. Geophys. Res. Atmos., 119: 418-444, doi: 10.1002/2013JD020523.
  31. Seung, Y.H., 2003. Significance of shallow bottom friction in the dynamics of the Tsushima Current. J. Oceanogr., 59: 113-118. https://doi.org/10.1023/A:1022828825667
  32. Seung, Y.H., 2005. Branching of the Tsushima Current by an abrupt increase of bottom depth. J. Oceanogr., 61: 261-269. https://doi.org/10.1007/s10872-005-0036-0
  33. Seung, Y.H. and K.j. Kim, 2011. Boundary currents in a meridional channel subject to seasonally varying buoyancy forcing: application to the Tsushima Current. J. Oceanogr., 67: 563-575. https://doi.org/10.1007/s10872-011-0057-9
  34. Seung, Y.H., S.Y. Han and E.P. Lim, 2012. Seasonal variation of volume transport through the straits of the East/Japan Sea viewed from the island rule. Ocean Polar Res., 34: 403-411, doi: 10.4217/ OPR.2012.34.4.403.
  35. Spall, M.A., 2002. Wind- and buoyancy-forced upper ocean circulation in two-strait marginal sea with application to the Japan/East Sea. J. Geophys. Res., 107(C1). Doi: 10.1029/2001JC0009666.
  36. Suda, K. and K. Hidaka, 1932. The results of the oceanographical observations on board RMS Syunpu Maru in the southern part of the Japan Sea in summer, 1929. J. Oceanogr, 3: 291-375.
  37. Takikawa, T., J.H. Yoon and K.D. Cho, 2005. The Tsushima Warm Current through Tsushima Straits estimated from Ferryboat ADCP data. J. Phys. Oceanogr., 35: 1154-1168. https://doi.org/10.1175/JPO2742.1
  38. Teague, W.J., G.A. Jacobs, P.A. Hwang, J.W. Book and H.T. Perkins, 2002. Low-Frequency Current Observations in the Korea/Tsushima Strait. J. Phys. Oceanogr., 32: 621-1641.
  39. Toba, Y., K. Tomizawa, Y. Kurasawa, K. Hanawa, 1982. Seasonal and year-to-year variability of the Tsushima-Tsugaru Warm Current system with its possible cause. La mer, 20: 41-51.
  40. Tsujino, H., H. Nakano and T. Motoi, 2008. Mechanism of currents through the straits of the Japan Sea: Mean state and seasonal variation. J. Oceanogr., 64: 141-161. https://doi.org/10.1007/s10872-008-0011-7
  41. Uda, M., 1934. The results of simultaneous oceanographical investigations in the Japan Sea and its adjacent waters in May and June, 1932. J Imp Fish Exp Sta, 5: 57-190.
  42. Yamamoto, M. and N. Hirose, 2011. Possible modification of atmospheric circulation over the northwestern Pacific induced by a small semi-enclosed ocean Geophys. Res. Lett., 38, L03804, doi: 10.1029/2010GL046214.
  43. Yang, J., X. Lin and D. Wu, 2013. Wind-driven exchanges between two basins: some topographic and latitudinal effects. J Geophys. Res., 118: 4585-4599. doi: 10.1002/jgrc.2033.
  44. Yoon, J.H., 1982a. Numerical experiment on the circulation in the Japan Sea. Part III. Mechanism of the Nearshore Branch of the Tsushima Current. J. Oceanogr. Soc. Japan, 38: 125-130. https://doi.org/10.1007/BF02110283
  45. Yoon, J.H., 1982b. Numerical experiment on the circulation in the Japan Sea. Part I. Formation of the East Korean Warm Current. J. Oceanogr. Soc. Japan, 38: 43-51. https://doi.org/10.1007/BF02110289