Journal of Oceanology and Limnology

, Volume 36, Issue 1, pp 62–76 | Cite as

Interannual variation of nutrients along a transect across the Kuroshio and shelf area in the East China Sea over 40 years

  • Yingying Hu (胡莹英)
  • Xinyu Guo (郭新宇)
  • Liang Zhao (赵亮)
Article
  • 76 Downloads

Abstract

Long-term datasets of water temperature, salinity, dissolved oxygen, phosphate and nitrate from 1973 to 2013 were used to study interannual variations of these parameters along a transect (section PN) across the Kuroshio and shelf area in the East China Sea. Water temperature and salinity at depths of 0–200 m showed a low-high-low-high pattern over the 40-year period. Water temperature and salinity at 500 m were relatively high from 1985 to 1990 and decreased continuously thereafter. Salinity at 800 m was lowest around 1993 and increased thereafter. Nutrients were highest between 1980 and 1985. After 1985, nutrients at 500 m were increasing. The range of variation in nutrients was large before 1985 and the magnitude increased with greater depths. Apparent oxygen utilization at 500 m depth was decreasing before 1990 and started to increase after 1992. Significant changes after 1990 at 500 m depth may be due to the upward trend of the upper boundary of Kuroshio intermediate water. Interannual variation of water temperature, salinity, dissolved oxygen, phosphate and nitrate along section PN has a significant correlation with the Pacific Decadal Oscillation index.

Keywords

Kuroshio East China Sea interannual variation nutrient phosphate nitrate 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Aoyama M, Goto H, Kamiya H, Kaneko I, Kawae S, Kodama H, Konishi Y, Kusumoto K I, Miura H, Moriyama E, Murakami K, Nakano T, Nozaki F, Sasano D, Shimizu T, Suzuki H, Takatsuki Y, Toriyama A. 2008. Marine biogeochemical response to a rapid warming in the main stream of the Kuroshio in the western North Pacific. Fish. Oceanogr., 17 (3): 206–218.CrossRefGoogle Scholar
  2. Bai Y, He X Q, Pan D L, Chen C T A, Kang Y, Chen X Y, Cai W J. 2014. Summertime Changjiang River plume variation during 1998-2010. J. Geophys. Res., 119 (9): 6238–6257.CrossRefGoogle Scholar
  3. Chen C T A. 2008. Distributions of nutrients in the East China Sea and the South China Sea connection. J. Oceanogr., 64 (5): 737–751.CrossRefGoogle Scholar
  4. Chen C T A. 2009. Chemical and physical fronts in the Bohai, Yellow and East China seas. J. Mar. Syst., 78 (3): 394–410.CrossRefGoogle Scholar
  5. Gong G C, Wen Y H, Wang B W, Liu G J. 2003. Seasonal variation of chlorophyll a concentration, primary production and environmental conditions in the subtropical East China Sea. Deep Sea Res. II Top. Stud. Oceanogr., 50 (6-7): 1219–1236.CrossRefGoogle Scholar
  6. Guo X Y, Zhu X H, Wu Q S, Huang D J. 2012. The Kuroshio nutrient stream and its temporal variation in the East China Sea. J. Geophys. Res., 117 (C1): C01026.CrossRefGoogle Scholar
  7. Hama T, Shin K H, Handa N. 1997. Spatial variability in the primary productivity in the East China Sea and its adjacent waters. J. Oceanogr., 53 (1): 41–51.CrossRefGoogle Scholar
  8. Hinata T. 1996. Seasonal variation and long-term trends of the oceanographic conditions along a fixed hydrographic line crossing the Kuroshio in the East China Sea. Oceanogr. Mag., 45: 9–32.Google Scholar
  9. Hu M H, Yang Y P, Xu C L, Harrison P J. 1990. Phosphate limitation of phytoplankton growth in the Changjiang estuary. Acta Oceanol. Sinica, 9 (3): 405–411.Google Scholar
  10. Huang S G, Yang J D, Ji W D, Yang X L, Chen G X. 1986. Spatial and temporal variation of reactive Si, N, P and their relationship in the Chang Jiang estuary water. Taiwan Strait, 5 (2): 114–123. (in Chinese with English abstract)Google Scholar
  11. Kouketsu S, Fukasawa M, Kaneko I, Kawano T, Uchida H, Doi T, Aoyama M, Murakami K. 2009. Changes in water properties and transports along 24°N in the North Pacific between 1985 and 2005. J. Geophys. Res., 114 (C1): C01008.CrossRefGoogle Scholar
  12. Lü X Q, Zhu C J, Zhang A B, Shi Z L. 1985. The characteristics of nutrient distribution in the southwest Bohai Sea and Huanghe River Estuary in summer. J. Shandong Coll. Oceanol., 15 (1): 146–158. (in Chinese with English abstract)Google Scholar
  13. Lui H K, Chen C T A, Lee J, Bai Y, He X Q. 2014. Looming hypoxia on outer shelves caused by reduced ventilation in the open oceans: case study of the East China Sea. Estuar., Coast. Shelf Sci., 151: 355–360.CrossRefGoogle Scholar
  14. Lui H K, Chen C T A, Lee J, Wang S L, Gong G C, Bai Y, He X Q. 2015. Acidifying intermediate water accelerates the acidification of seawater on shelves: an example of the East China Sea. Cont. Shelf Res., 111: 223–233.CrossRefGoogle Scholar
  15. Takatani Y, Sasano D, Nakano T, Midorikawa T, Ishii M. 2012. Decrease of dissolved oxygen after the mid-1980s in the western North Pacific subtropical gyre along the 137°E repeat section. Global Biogeochem. Cycles, 26 (2): GB2013.CrossRefGoogle Scholar
  16. Wang Y H. 1991. Marine Atlas of Bohai Sea, Yellow Sea, East China Sea, Voloum 2: Chemistry. China Ocean Press, Beijing, China. 257p. (in Chinese)Google Scholar

Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Yingying Hu (胡莹英)
    • 1
  • Xinyu Guo (郭新宇)
    • 1
    • 2
    • 3
  • Liang Zhao (赵亮)
    • 4
  1. 1.Center for Marine Environmental StudiesEhime UniversityMatsuyamaJapan
  2. 2.Key Laboratory of Marine Environment and Ecology, Ministry of EducationOcean University of ChinaQingdaoChina
  3. 3.College of Environmental Science and EngineeringOcean University of ChinaQingdaoChina
  4. 4.College of Marine and Environmental SciencesTianjin University of Science and TechnologyTianjinChina

Personalised recommendations