The statistical estimation of the vertical distribution of chlorophyll a concentration in the South China Sea

GAO Shan; WANG Hui; LIU Gui-mei; HUANG Liang-min

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Article Navigation > Haiyang Xuebao > 2010 > 32(4): 168-176

GAO Shan, WANG Hui, LIU Gui-mei, HUANG Liang-min. The statistical estimation of the vertical distribution of chlorophyll a concentration in the South China Sea[J]. Haiyang Xuebao, 2010, 32(4): 168-176.

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GAO Shan, WANG Hui, LIU Gui-mei, HUANG Liang-min. The statistical estimation of the vertical distribution of chlorophyll a concentration in the South China Sea[J]. Haiyang Xuebao, 2010, 32(4): 168-176.

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The statistical estimation of the vertical distribution of chlorophyll a concentration in the South China Sea

1.
College of Environmental Science and Engineering, Ocean University of China,Qingdao 266100,China;National Marine Environmental Forecasting Center,State Oceanic Administration,Beijing 100081,China
2.
National Marine Environmental Forecasting Center,State Oceanic Administration,Beijing 100081,China
3.
Key Laboratory of Manine Bio-resources Sustainable Utilization(LMB),Chinese Academy of Sciences,Guangzhou 510301,China;Key Laboratory of Tropical Marine Environmental Dynamics(LED),Chinese Academy of Sciences,Guangzhou 510301,China

Received Date: 2009-11-30

Abstract

Abstract

Samplings of chlorophyll a (Chl a) concentration are analyzed based on historical cruises data for about 10 a in the South China Sea (SCS), including the northern SCS, the Nansha Islands and other sea areas in the SCS. The profiles of Chl a concentration are classified by the values within the surface layer, to develop a parameterization shape of Chl a concentration vertical profiles according to a generalized Gaussian model (adding a linear decline with a slope starting from the surface value). The modeled Chl a concentration vertical profiles show a normal distribution with a slightly declining slope, and fit well with the in situ Chl a concentration. The max value appears in subsurface layer, as the surface Chl a concentration is low, which represents deep-sea basin waters(Case I); while the difference between the modeled Chl a value and the in situ Chl a concentration is obvious, and the max value appears near the surface layer, as the surface Chl a concentration is high, which represents coastal and estuary waters(Case II).The results make an exploratory and tentative contribution to the vertical distributions of the Chl a concentration in the SCS, and lead to an empirical model and parameterization applicable to different oceanic waters. By combining this tool with satellite ocean color data, it becomes possible to reveal spatial and temporal distribution of phytoplankton biomass in the SCS.
- South China Sea,
- chlorophyll a,
- vertical distribution 

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