| WANG Guifen,CAO Wenxi,XU Dazhi,YANG Yuezhong. 2007. Variability of phytoplankton absorption in the northern South China Sea: influence of the size structure and pigment composition of algal populations. Acta Oceanologica Sinica, (2):12－25 |
| Variability of phytoplankton absorption in the northern South China Sea: influence of the size structure and pigment composition of algal populations |
| Variability of phytoplankton absorption in the northern South China Sea: influence of the size structure and pigment composition of algal populations |
| Received:May 04, 2006 Revised:November 08, 2006 |
| DOI： |
| Key words:absorption coefficient of phytoplankton size structure pigment composition bio-optical model ocean color |
| 中文关键词: absorption coefficient of phytoplankton size structure pigment composition bio-optical model ocean color |
| 基金项目: |
| Author Name | Affiliation | E-mail | | WANG Guifen | 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 | wxcao@scsio.ac.cn | | CAO Wenxi | Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | XU Dazhi | 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 | | | YANG Yuezhong | Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | |
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| Abstract: |
| Data from three cruises conducted in the Zhujiang River (ZR), coastal waters of Guangdong (CWGD) and the northern South China Sea (NSCS) during 2003 and 2004 were examined for assessing the relative importance of pigment composition and packaging effect in modifying the specific absorption coefficients of phytoplankton.The three survey regions differ widely in their phytoplankton community with large cells dominating the ZR and CWGD waters and small cells dominating the NSCS region.Variations in the size structure and the accessory pigments have much effect on the chlorophyll a-specific absorption coefficient of phytoplankton.The size index accounted for about 42% and 33% of the variation of the specific absorption coefficient at 440 and 675 nm, respectively.Using the multiple regression analysis approach, pigment concentrations for each sample were calculated.The accessory pigments other than chlorophyll a contribute to absorption mainly in the blue-to-green region of the spectrum and their absorptions account for about 44%, 43% and 53% on the average of the total phytoplankton absorption at 440 nm for the ZR, CWGD and NSCS regions.Among the accessory pigments, the photosynthetic carotenoids (noted PSC) play a dominant role in the ZR and CWGD waters, while in the NSCS the nonphotosynthetic carotenoids (noted PPC) as well as PSC have important contributions.Because the variations of both the size structure and accessory pigments in algal populations contributed to the variability of the specific absorption coefficient in the study regions, these factors may be considered explicitly in future bio-optical algorithms to derive chlorophyll a concentration more accurately. |
| 中文摘要: |
| Data from three cruises conducted in the Zhujiang River (ZR), coastal waters of Guangdong (CWGD) and the northern South China Sea (NSCS) during 2003 and 2004 were examined for assessing the relative importance of pigment composition and packaging effect in modifying the specific absorption coefficients of phytoplankton.The three survey regions differ widely in their phytoplankton community with large cells dominating the ZR and CWGD waters and small cells dominating the NSCS region.Variations in the size structure and the accessory pigments have much effect on the chlorophyll a-specific absorption coefficient of phytoplankton.The size index accounted for about 42% and 33% of the variation of the specific absorption coefficient at 440 and 675 nm, respectively.Using the multiple regression analysis approach, pigment concentrations for each sample were calculated.The accessory pigments other than chlorophyll a contribute to absorption mainly in the blue-to-green region of the spectrum and their absorptions account for about 44%, 43% and 53% on the average of the total phytoplankton absorption at 440 nm for the ZR, CWGD and NSCS regions.Among the accessory pigments, the photosynthetic carotenoids (noted PSC) play a dominant role in the ZR and CWGD waters, while in the NSCS the nonphotosynthetic carotenoids (noted PPC) as well as PSC have important contributions.Because the variations of both the size structure and accessory pigments in algal populations contributed to the variability of the specific absorption coefficient in the study regions, these factors may be considered explicitly in future bio-optical algorithms to derive chlorophyll a concentration more accurately. |
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