Demonstration of a new indicator for studying upwelling in the Northern South China Sea

Li Lin, You Shao Wang, Cui Ci Sun, Nan Li, Haili Wang, B. Greg Mitchell, Mei Lin Wu, Hui Song, Jing Feng Wu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In order to demonstrate that silicate (SiO3-Si) can be used as an indicator to study upwelling in the northern South China Sea, hierarchical cluster analysis (CA) and principle component analysis (PCA) were applied to analyse the metrics of the data consisting of 14 physical-chemical-biological parameters at 32 stations. CA categorized the 32 stations into two groups (low and high nutrient groups). PCA was applied to identify five Principal Components (PCs) explaining 78.65% of the total variance of the original data. PCA found important factors that can describe nutrient sources in estuarine, upwelling, and non-upwelling areas. PC4, representing the upwelling source, is strongly correlated to SiO3-Si. The spatial distribution of silicate from the surface to 200 m depth clearly showed the upwelling regions, which is also supported by satellite observations of sea surface temperature.

Original languageEnglish (US)
Pages (from-to)605-613
Number of pages9
Issue number2
StatePublished - 2011

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science
  • Ocean Engineering
  • Atmospheric Science


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