南海叶绿素浓度的时空变化特征分析*

doi:10.11978/j.issn.1009-5470.2012.04.006

Abstract

Abstract:

Based on nearly 13 years’ SeaWiFS chlorophyll-a (Chl-a) concentration data, the authors analyzed the temporal and spatial variation of Chl-a in the South China Sea (SCS) using the empirical orthogonal function (EOF). The first four EOF modes captured the major features of Chl-a in the SCS. EOF1 describes the fundamental variation of Chl-a with higher concentration over the shallow water and lower concentration over the deep basin. EOF2 presents a high Chl-a concentration band extending eastward from the South Vietnam coast in summer, which is related to the coastal upwelling. In addition to its distinct seasonal variation, this EOF mode also shows a significant interannual variability associated with El Ni?o-Southern Oscillation events (ENSO). EOF3 discloses the evidence that the Chl-a concentration increases with the enhancement of northeasterly monsoon in winter. The Chl-a concentration is characterized by high values north of the NE-SW axis and reaches its maximum to the northwest of Luzon Island. Unlike the first three EOF modes, EOF4 reveals a semi-annual variability of Chl-a with a tri-pole structure, which corresponds very well with the spatial distribution of sea surface height.

Key words: South China Sea, chlorophyll-a concentration, ocean remote sensing, empirical orthogonal function

LIU Xin, WANG Jing, CHENG Xu-hua, YAN Tong. The temporal and spatial evolution of chlorophyll-a concentration in the South China Sea[J].Journal of Tropical Oceanography, 2012, 31(4): 42-48.

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The temporal and spatial evolution of chlorophyll-a concentration in the South China Sea

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