DOI QR코드

DOI QR Code

Seasonal Characteristics of Temperature and Salinity Variations Around the Tongyeong and Geoje Coastal Waters by a Cluster Analysis

군집분석을 이용한 통영·거제 연안역의 수온·염분 계절 변동 특성

  • Kim, Byeong Kuk (Faculty of Marine Technology, Chonnam National University) ;
  • Lee, Chang Rae (Marine Research Center, National Park Research Institute, Korea National Park Service) ;
  • Lee, Moon Ock (Faculty of Marine Technology, Chonnam National University) ;
  • Kim, Jong Kyu (Faculty of Marine Technology, Chonnam National University)
  • 김병국 (전남대학교 해양기술학부) ;
  • 이창래 (국립공원관리공단 국립공원연구원 해양연구센터) ;
  • 이문옥 (전남대학교 해양기술학부) ;
  • 김종규 (전남대학교 해양기술학부)
  • Received : 2016.02.23
  • Accepted : 2016.06.02
  • Published : 2016.08.25

Abstract

This study was carried out to understand the characteristic distributions of water temperature and salinity in accordance with seasons atound the Tongyeong and Geoje, based on a cluster analysis. Water temperatures in coastal areas were $1-2^{\circ}C$ higher than those in open seas when in the spring, autumn and winter. In particular, a south-northward isothermal line was established at the bottom layer in the winter of 2014, unlikely to the surface layer. In addition, a south-northward isohaline was also established at the bottom layer in the winter of 2013. Therefore, we recognized that a moving pattern of water masses has also a difference since forming directions of those lines were not equivalent with each other between the surface and bottom layers. In contrast, stratification appeared in the summer with a roughly difference of water temperature of $10^{\circ}C$ and a salinity of 2-10 psu between the layers. A cluster analysis indicated that the southeastern coastal waters have three distinct water masses, even though some complicated situations exist due to the seawater inflow from the outside. However, the result of a cluster analysis turned out quite reasonable because the result of a regression analysis proved that it is appropriate, just except for the timing of a south-northward front formation.

통영 거제연안역에서의 해양생태계 관측 결과를 군집분석하여 이 해역에서의 계절에 따른 수온 염분 분포 특징을 파악하고자 하였다. 춘계, 추계 및 동계에는 연안역이 외해역에 비해 수온이 $1{\sim}2^{\circ}C$ 정도 높았으며, 특히 2014년 동계의 저층은 표층과는 달리 남-북 방향으로 등수온선을 형성하였다. 염분 또한 2013년 동계에는 저층에서 남-북 방향의 등염분선을 형성하였다. 따라서, 표 저층의 등수온 및 등염분선의 방향이 서로 달라, 수괴의 이동 패턴도 서로 다르다는 사실을 확인하였다. 반면 하계 표 저층에는 수온이 약 $10^{\circ}C$, 염분은 외해 2 psu, 거제연안 10 psu 이상인 성층이 형성되었다. 군집분석 결과, 이 해역의 수괴는 크게 세 개의 군집으로 나눌 수 있었으나, 해수의 유입 등에 의해 복잡한 군집을 이루는 경우도 있었다. 이러한 군집분석 결과는 군집의 형태가 남-북 방향으로 형성되는 시기를 제외하고는 비교적 적합한 것임을 회귀분석을 통해 확인하였다.

Keywords

References

  1. Chen, C.Y., Folt, C.L., 2002, "Ecophysiological responses to warming events by two sympatric zooplankton species", J. Plankton Res., Vol.24, No.6, 579-589. https://doi.org/10.1093/plankt/24.6.579
  2. Choi, Y.K., Yang, J.Y., Lee, Y.S., Yu, J., Kim, D.K., Han, I.S. and Go, W.J., 2007, "Characteristics of Ocean Environment in the Dry and Wet Seasons in the South Sea of Korea", J. Environ. Sci., Vol.16, No.4, 459-466.
  3. Humborg, C, Ittekkot, A., Cociasu, A. and Bodungen, B.V., 1997, "Effect of Danube River dan on Black Sea biogeochemistry and ecosystem structure", Nature Vol.386, 385-388. https://doi.org/10.1038/386385a0
  4. Isobe A., 2008, "Recent advances in ocean-circulation research on the Yellow Sea and East China Sea shelves", J. Oceanogr, Vol.64, 569-584. https://doi.org/10.1007/s10872-008-0048-7
  5. Jeong, D.H., Shin, H.H., Jung, S.W. and Lim, D.I., 2013, "Variations and Characters of Water Quality during Flood and Dry Seasons in the Eastern Coast of South Sea, Korea", Korean J. Environ. Biol., Vol.31, No.1, 19-36. https://doi.org/10.11626/KJEB.2013.31.1.019
  6. Jang, P.G., Hyun, B.G., Cha, H.G., Chung, H.S., Jang, M.C. and Shin, K.S., 2013, "Seasonal Variation of Phytoplankton Assemblages Related to Surface Water Mass in the Eastern Part of the South Sea in Korea", Ocean Polar Res., Vol.35, No.2, 157-170. https://doi.org/10.4217/OPR.2013.35.2.157
  7. Jeong, H.J., Park, J,K., Choi., H.Y., Yang, J.S., Shim, J.H., Shin, Y.K., Yih, W.H., Kim, H.S. and Cho, K.J., 2000, "The Outbreak of Red Tides in the Coastal Water off Kohung, Chonnam, Korea 2. The Temporal and Spatial Variations in the Phytoplanktonic Community in 1997", J. Korean Soc. Oceanogr., Vol.5, No.1, 27-36.
  8. Kim, AR., Youn, S.H., Chung, M.H., Yoon, S.C. and Moon C.H., 2014. "The Influences of Coastal Upwelling on Phytoplankton Community in the Southern Part of East Sea, Korea", J. Korean Soc. Oceanogr., Vol.19, No.4. 287-301.
  9. Lee, T.S. and Kim, K.H., 1998, "A Study on the Origin of Anomalously Low Saline Tsushima Current Water Using $^{228}Ra$", J. Korean Soc. Oceanogr., Vol.3, No.4, 175-182.
  10. Lim, D.L., Um, I.K., Jeon, S.K., Yoo, M.J. and Jung, H.S., 2003, "Physiochemical Characteristics of Coastal Pseude-Estuarine Environment Formed During the Summer Flood Season in the South Coast of Korea", J. Korean Soc. Oceanogr., Vol.8, No.2, 151-163.
  11. NIFS, National Institute of Fisheries Science, http://www.nifs.go.kr.
  12. Pang, I.C., Hong, C.S. and Oh, K.H., 2001, "Study on Physical Oceanographic Environments in the Coastal Sea of Chung-Moon, Cheju Island", J. Korean Soc. Oceanogr., Vol.6, No.4, 211-217.
  13. Seong, K.T., Hwang, J.D., Han, I.S., Go, W.J., Suh, Y.S. and Lee, J.Y., 2010, "Characteristic for Long-term Trends of Temperature in the Korean Waters", J. Korean Soc. of Mar. Environ. Saf., Vol.16, No.4, 353-360.
  14. Yang, J.S., Choi, H.Y., Jeong, H.J., Jeong, J.Y. and Park, J.K., 2000, "The Outbreak of Red Tides in the Coastal Waters off Kohung, Chonnam, Korea: 1. Physical and Chemical Characteristics in 1997", J. Korean Soc. Oceanogr., Vol.5, No.1, 16-26.