Effects of size structure and pigment composition of algal population on phytoplankton absorption coefficients in the South China Sea

WANG Gui-fen; CAO Wen-xi; XU Da-zhi; YANG Yue-zhong

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WANG Gui-fen, CAO Wen-xi, XU Da-zhi, YANG Yue-zhong. Effects of size structure and pigment composition of algal population on phytoplankton absorption coefficients in the South China Sea[J]. Haiyang Xuebao, 2007, 29(1): 38-48.

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Effects of size structure and pigment composition of algal population on phytoplankton absorption coefficients in the South China Sea

1.
Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Graduate School, Chinese Academy of Sciences, Beijing 100039, China
2.
Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2005-11-04
Rev Recd Date: 2006-03-20

Abstract

Abstract

Data from three cruises conducted in the Zhujiang River (ZR) Estuary, costal waters of Guangdong (CWGD) of China and north of the South China Sea (NSCS) were examined to access the relative importance of pigment composition and package effect in modifying the phytoplankt on specific absorption coefficients.The three cruises differed widely in their phytoplankt on assem blages with large cells dominating the ZR and CWGD cruises and small cells dominating the NSCS cruise.And therefore the package effect for the ZR and CWGD cruises is greater than that of the NSCS cruise, with their estimated contributions to the phytoplankt on specific absorption coefficients at 675 nm being 40%, 20% and 6% respectively.Using the multiple regression analysis approach, pig ment concentrations for each sample were calculated.The accessory pigments, except chlor ophylla, contributed to absorption mainly in the blue-to-green region of the spectrum, for the ZR, CWGD and NSCS cruises, their absorption accounting for about 44%, 43% and 53% on average to total phytoplankton absorption at 440 nm.A mong the accessory pig ments, the photosynt hetic carotenoids played the dominantrole in the ZR and CWGD cruises, while in the NSCS cruise the phot oprotectant carotenoids and the photosynt hetic carotenoids had important contributions.Since the variations of size structure of algal population and the accessory pigments contributed differently to the variability in the phytoplankt on specific absorption coefficients for estuary, coastal waters and open oceanic waters, it is suggested that in order to set up a more perfect bio-optical algorithm in the NSCS, the variations in the optical properties of phytoplankt on caused by the pigment package effect and changes in the relative abundance of accessory pigments should be incorpo rated.
- absorption coefficient of phytoplankt on,
- size structure,
- pigment composition,
- bio-optical model,
- ocean color remote sensing

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