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Ocean Dynamics

, Volume 66, Issue 3, pp 387–399 | Cite as

Observation of summertime upwelling off the eastern and northeastern coasts of Hainan Island, China

  • Peigen Lin
  • Jianyu HuEmail author
  • Quanan Zheng
  • Zhenyu Sun
  • Jia Zhu
Article

Abstract

Using cruise observations and reanalysis data, this study analyzes the effects of wind, freshwater, and turbulent mixing on the two upwellings: one is off the eastern coast of Hainan Island (HEU) and the other is off the northeastern coast of Hainan Island (HNEU). During the cruise in 2009, the HNEU occurred with southwesterly to southeasterly wind. The relative large values of turbulent kinetic energy dissipation rate and diffusivity estimated from the Thorpe scale indicate that the upwelling water is further uplifted to the surface by strong turbulent mixing in the HNEU region. But the HEU was not observed under the southeasterly wind. During the cruise in 2012, the HNEU disappeared in the upper layer with freshwater covered and southeasterly wind, while the apparent HEU only accompanied with southwesterly wind. To obtain the general characteristics, we define three types of upwelling patterns, i.e., the intensified HEU, the intensified HNEU, and both HEU and HNEU in one day, using the reanalysis data. The composites of sea surface temperature (SST), wind, and precipitate for each upwelling pattern identify that the HNEU is associated with the prevailing southeasterly wind and can be limited in the lower layer when it is covered by freshwater. But the HEU is mainly driven by southwesterly wind but is not remarkably affected by freshwater.

Keywords

Upwelling off Hainan Island Wind Freshwater Turbulent mixing Fuzzy c-means algorithm 

Notes

Acknowledgments

The authors appreciate two anonymous reviewers for suggestions that improved this manuscript. This work is supported by the National Basic Research Program of China projects 2015CB954004 and 2009CB421208, and the National Natural Science Foundation of China projects 41276006 and U1405233. The authors also thank the crew of R/V Dongfanghong 2 for help with the cruise survey and Shaoling Shang for helpful comments.

References

  1. Alford MH, MacKinnon JA, Nash JD, Simmons H, Pickering A, Klymak JM, Pinkel R, Sun O, Rainville L, Musgrave R, Beitzel T, Fu KH, Lu CW (2011) Energy flux and dissipation in Luzon Strait: two tales of two ridges. J Phys Oceanogr 41(11):2211–2222Google Scholar
  2. Brink KH, Lentz SJ (2010) Buoyancy arrest and bottom Ekman transport part I: steady flow. J Phys Oceanogr 40(4):621–635CrossRefGoogle Scholar
  3. Chen Z, Yan X, Jo YH, Jiang L, Jiang Y (2012) A study of Benguela upwelling system using different upwelling indices derived from remotely sensed data. Cont Shelf Res 45:27–33CrossRefGoogle Scholar
  4. Dillon TM (1982) Vertical overturns: a comparison of Thorpe and Ozmidov length scales. J Geophys Res 87(C12):9601–9613CrossRefGoogle Scholar
  5. Galbraith PS, Kelley DE (1996) Identifying overturns in CTD profiles. J Atmos Ocean Technol 13:688–702CrossRefGoogle Scholar
  6. Gan J, Cheung A, Guo X, Li L (2009) Intensified upwelling over a widened shelf in the northeastern South China Sea. J Geophys Res 114, C09019. doi: 10.1029/2007JC004660 Google Scholar
  7. Guo F, Shi M, Xia Z (1998) Two-dimension diagnose model to calculate upwelling on offshore of the east coast of Hainan Island. Acta Oceanol Sin 20(6):109–116 (in Chinese with English abstract)Google Scholar
  8. Han Y, Wang M, Ma K (1990) The lowest surface water temperature area of China Sea in summer-the upwelling along the east coast of Hainan Island. Oceanol Et Limnol Sin 21(3):267–275 (in Chinese with English abstract)Google Scholar
  9. Hu J, Kawamura H, Hong H, Qi Y (2000) A review on the currents in the South China Sea: seasonal circulation, South China Sea warm current and Kuroshio intrusion. J Oceanogr 56(6):607–624CrossRefGoogle Scholar
  10. Huffman GJ, Bolvin DT, Nelkin EJ, Wolff DB, Adler RF, Gu G, Hong Y, Bowman KP, Stocker EF (2007) The TRMM multisatellite precipitation analysis (TMPA): quasi-global, multiyear, combined-sensor precipitation estimates at fine scales. J Hydrometeorol 8(1):38–55CrossRefGoogle Scholar
  11. Jiang Y, Chai F, Wan Z, Zhang X, Hong H (2011) Characteristics and mechanisms of the upwelling in the southern Taiwan Strait: a three-dimensional numerical model study. J Oceanogr 67(6):699–708CrossRefGoogle Scholar
  12. Jing Z, Qi Y, Hua Z, Zhang H (2009) Numerical study on the summer upwelling system in the northern continental shelf of the South China Sea. Cont Shelf Res 29(2):467–478CrossRefGoogle Scholar
  13. Jing Z, Qi Y, Du Y (2011) Upwelling in the continental shelf of northern South China Sea associated with 1997–1998 El Niño. J Geophys Res 116, C02033. doi: 10.1029/2010JC006598 Google Scholar
  14. Klymak JM, Alford MH, Pinkel R, Lien RC, Yang YJ, Tang TY (2011) The breaking and scattering of the internal tide on a continental slope. J Phys Oceanogr 41(5):926–945CrossRefGoogle Scholar
  15. Lentz SJ, Fewings MR (2012) The wind-and wave-driven inner-shelf circulation. Ann Rev Mar Sci 4:317–343. doi: 10.1146/annurev-marine-120709-142745 CrossRefGoogle Scholar
  16. Lentz SJ, Trowbridge JH (1991) The bottom boundary layer over the northern California shelf. J Phys Oceanogr 21(8):1186–1201CrossRefGoogle Scholar
  17. Li L (1990) A study on the summer upwellings in shelf waters west to Zhujiang River mouth. J Oceanogr Taiwan Strait 9(4):338–346 (in Chinese with English abstract)Google Scholar
  18. Li Y, Peng S, Yang W, Wang D (2012) Numerical simulation of the structure and variation of upwelling off the east coast of Hainan Island using QuikSCAT winds. Chin J Oceanol Limnol 30:1068–1081CrossRefGoogle Scholar
  19. Lin P, Cheng P, Gan J, Hu J (2016) Dynamics of wind-driven upwelling off the northeastern coast of Hainan Island. J Geophys Res Oceans 121. doi: 10.1002/2015JC011000
  20. Liu Z, Lozovatsky I (2012) Upper pycnocline turbulence in the northern South China Sea. Chin Sci Bull 57(18):2302–2306CrossRefGoogle Scholar
  21. Mamayev OI (1975) Temperature-salinity analysis of world oceans. Elsevier oceanography series, New york Google Scholar
  22. Nash JD, Alford MH, Kunze E, Martini K, Kelly S (2007) Hotspots of deep ocean mixing on the Oregon continental slope. Geophys Res Lett 34, L01605. doi: 10.1029/2006GL028170 CrossRefGoogle Scholar
  23. Osborn TR (1980) Estimates of the local rate of vertical diffusion from dissipation measurements. J Phys Oceanogr 10:83–89CrossRefGoogle Scholar
  24. Song X, Lai Z, Ji R, Chen C, Zhang J, Huang L, Zhu X (2012) Summertime primary production in northwest South China Sea: interaction of coastal eddy, upwelling and biological processes. Cont Shelf Res 48:110–121CrossRefGoogle Scholar
  25. Sousa FM, Nascimento S, Casimiro H, Boutov D (2008) Identification of upwelling areas on sea surface temperature images using fuzzy clustering. Remote Sens Environ 112(6):2817–2823CrossRefGoogle Scholar
  26. Stansfield K, Garrett C, Dewey R (2001) The probability distribution of the Thorpe displacement within overturns in Juan de Fuca Strait. J Phys Oceanogr 31:3421–3434CrossRefGoogle Scholar
  27. Su J, Pohlmann T (2009) Wind and topography influence on an upwelling system at the eastern Hainan coast. J Geophys Res 114, C06017. doi: 10.1029/2008JC005018 Google Scholar
  28. Su J, Wang J, Pohlmann T, Xu D (2011) The influence of meteorological variation on the upwelling system off eastern Hainan during summer 2007–2008. Ocean Dyn 61(6):717–730CrossRefGoogle Scholar
  29. Thorpe SA (1977) Turbulence and mixing in a Scottish loch. Philos Trans R Soc Lond 286A:125–181CrossRefGoogle Scholar
  30. Wang D, Wang H, Li M, Liu G, Wu X (2013) Role of Ekman transport versus Ekman pumping in driving summer upwelling in the South China Sea. J Ocean Univ China 12(3):355–365CrossRefGoogle Scholar
  31. Xie L, Zhang S, Zhao H (2012) Overview of studies on Qiongdong upwelling. J Trop Oceanogr 31(4):35–41 (in Chinese with English abstract)Google Scholar
  32. Yu W (1987) A preliminary approach of the upwelling for the northern South China Sea. Mar Sci 6:7–10 (in Chinese with English abstract)Google Scholar
  33. Zhang HM, Bates JJ, Reynolds RW (2006) Assessment of composite global sampling: sea surface wind speed. Geophys Res Lett 33, L17714. doi: 10.1029/2006GL027086 CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Peigen Lin
    • 1
  • Jianyu Hu
    • 1
    Email author
  • Quanan Zheng
    • 1
    • 2
  • Zhenyu Sun
    • 1
  • Jia Zhu
    • 1
  1. 1.State Key Laboratory of Marine Environmental Science, College of Ocean and Earth SciencesXiamen UniversityXiamenChina
  2. 2.Department of Atmospheric and Oceanic ScienceUniversity of MarylandCollege ParkUSA

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