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Acta Oceanologica Sinica

, 30:71 | Cite as

Analysis of thermohaline and current distribution characteristics of Zhejiang and Fujian waters in summer

  • Panjun Du
  • Hui ZhangEmail author
  • Wenjun Xiao
  • Xing Kang
  • Qinle Guan
Article

Abstract

This paper analyzed the distribution of thermohaline and circulation characteristics of Zhejiang and Fujian waters, based on the cross-sectional thermohaline data and on current data (up to 30 d duration) at fixed-point moorings, collected in the summer of 2006. We also performed low-pass filtering and spectrum analysis on the mooring submersible buoy data. Based on that analysis, we discussed the characteristics of low frequency currents and time-variations in these waters. The main conclusions are as follows. (1) There is a low salinity pinnate area near the Hangzhou Bay in summer, and outside the low salinity area, an obvious salinity front is present from surface to bottom near 123°E. There is also a temperature front below the surface at a corresponding position. (2) Bottom water of the Taiwan Warm Current comes from the subsurface of Kuroshio. (3) The direction of low frequency current at fixed anchor stations is N-NE or S, which mainly depends on the interaction of control currents in this waters. (4) Significant spectral peaks at all mooring stations are typically semidiurnal and diurnal tides. Semidiurnal tidal waves are the main ones in these waters, and have more energy closer to the shore. (5) Significant energy spectral peaks of middle period (3 to 8 d) of currents are responses to weather frequency. (6) Significant energy spectral peaks of long periods at the surface or bottom are probably responses to seasonal wind or bottom friction, while, the long period peaks of other depths can reflect cyclical changes of interactions between currents. We conclude that the pulsation period of the Taiwan Warm Current in these waters is 10–17 d.

Key words

Zhejiang and Fujian waters thermohaline distribution low-frequency current spectrum analysis Taiwan Warm Current Kuroshio subsurface water 

References

  1. Brink K H. 1985. Tidal and lower frequency currents above Fieberling Guyot. Journal of Geophysical Research, 100(C6): 10817–10832CrossRefGoogle Scholar
  2. Chen Jiyu, Wang Baocan, Yu Zhiying. 1989. Orderliness of China’s Coastal Development and Evolution (in Chinese). Shanghai: Shanghai Science and Technology Press, 393–402Google Scholar
  3. Guan Bingxian. 2002. Headwind Currents in Winter of Southeast China’s Coastal Waters (in Chinese). Qingdao: Ocean University of China Press, 210–214Google Scholar
  4. Huang Jiayou. 2004. Statistical Analysis and Prediction of Meteorological (in Chinese). Beijing: Meteorological Press, 222–224Google Scholar
  5. Liang Chujin, Hou Yijun, Chen Qi, et al. 2004. Lowfrequency current characteristics near bottom of China pioneer area. Science Bulletin (in Chinese), 49(11): 1116–1120Google Scholar
  6. Liu Yonggang, Yuan Yaochu, Liu Cho-teng, et al. 2004. Measurement of the current and spectra analysis on the continental shelf in the East China Sea. Acta Oceanologica Sinica, 23(2): 201–212Google Scholar
  7. Shen Huanting, Mao Zhichang, Zhu Jianrong. 2003. Saltwater Intrusion of the Yangtze Estuary (in Chinese). Beijing: China Ocean Press, 15–30Google Scholar
  8. Su Jilan. 2005. Coastal Hydrology in China (in Chinese). Beijing: China Ocean Press, 66–78Google Scholar
  9. Su Yufen. 1990. Current characters of observe station in East China Sea May to June in 1986 (in Chinese). Selected Papers of the Kuroshio Research, v 1. Beijing: China Ocean Press, 193–201Google Scholar
  10. Yuan Yaochu, Liao Guanghong, Wang Huiqun, et al. 2009. Geostrophic flow and spectral analysis based on observations and satellite data-changes in currents of Luzon Strait in spring 2002. Science in China: D. Earth Sciences (in Chinese), 39(3): 370–381Google Scholar

Copyright information

© The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Panjun Du
    • 1
  • Hui Zhang
    • 1
    Email author
  • Wenjun Xiao
    • 1
    • 2
  • Xing Kang
    • 1
  • Qinle Guan
    • 1
  1. 1.East China Sea Marine Forecasting Center, East China Sea BranchState Oceanic AdministrationShanghaiChina
  2. 2.State Key Laboratory of Estuarine and Coastal ResearchEast China Normal UniversityShanghaiChina

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