Enhanced primary production in the oligotrophic South China Sea by eddy injection in spring

I. I. Lin*, Chun Chi Lien, Chau Ron Wu, George T.F. Wong, Chih Wei Huang, Tzu Ling Chiang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


In May 2003, a phytoplankton bloom of chlorophyll-a (Chl-a) concentration of 0.3-0.4 mgm-3 was observed at the centre of northern South China Sea (SCS) by NASA's Sea-viewing Wide Field-of-View sensor. As this region is remote and known to be oligotrophic in spring (Chl-a concentration typically at ∼0.05-0.08 mgm-3), it is intriguing to explore this unusual happening. Based on six different remote sensing data and numerical modelling, the results suggest that the injection of an ocean eddy is the most likely cause of the bloom. Due to long-range transport of a large (700 × 500 km) anti-cyclonic ocean eddy, coastal nutrients and plankton could be brought across hundreds of kilometres to the centre of northern SCS and impact the biogeochemistry. The open ocean part of the northern SCS basin has long been considered generally free from coastal influences. This work provides new evidence that proves otherwise. Moreover, from the perspective of physical oceanography, it is interesting to observe that, outside the monsoon seasons, there can be well-defined anti-cyclonic ocean circulation existing in the SCS without the prevailing monsoonal wind.

Original languageEnglish
Article numberL16602
JournalGeophysical Research Letters
Issue number16
Publication statusPublished - 2010 Aug 1

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences


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