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学科主题: Oceanography
题名: Variations in light absorption properties during a phytoplankton bloom in the Pearl River estuary
作者: Wang, GF ; Cao, WX ; Yang, YZ ; Zhou, W ; Liu, S ; Yang, DT
通讯作者: wxcao@scsio.ac.cn
关键词: Light absorption ; Algal bloom ; Pearl River Estuary
刊名: CONTINENTAL SHELF RESEARCH
发表日期: 2010
卷: 30, 期:9, 页:1085-1094
收录类别: sci
部门归属: [Wang, Guifen; Cao, Wenxi; Yang, Yuezhong; Zhou, Wen; Liu, Sheng; Yang, Dingtian] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Trop Marine Environm Dynam, Guangzhou 510301, Guangdong, Peoples R China
项目归属: LED
摘要: From 15 to 28 August in 2007, a Chaetoceros socialis bloom was detected in the Pearl River Estuary water with chlorophyll a concentration (Chl a) up to 30 mg m(-3) and cell density up to 10(6) cells L-1. Time series of bio-optical measurements was obtained at a single site (114.29 degrees E, 22.06 degrees N) with the mooring of marine optical buoy. Light absorption properties of seawater experienced large variability throughout the algal bloom. Absorption by colored dissolved organic matter (CDOM) was one of the dominant optical components of the light absorption (30-70%) especially for pre- and post-bloom waters, and it tended to decrease with Chl a during the algal bloom. Absorption by phytoplankton was another dominant optical component (18-50%) and increased rapidly with Chl a. Phytoplankton and accompanying material played dominant roles in light absorption as indicated by the relationship between absorption coefficient and Chl a. At high pigment concentrations, water samples showed significantly lower specific phytoplankton absorption, compared with pre- and post-bloom conditions, with the specific phytoplankton concentration at 443 nm varied between 0.011 and 0.022 m(2) mg(-1) and that at 676 nm between 0.007 and 0.018 m(2) mg(-1); small values of blue-to-red ratio of phytoplankton were also observed. These lower values were associated with variations in phytoplankton size structure. Spectral variability of phytoplankton absorption and total absorption (not including the fixed background absorption by pure water itself) could be expressed as simple linear functions linking absorption at one wavelength to the absorption at the other wavelengths, with the slope of the relationship changing with wavelength. The absorption coefficients by non-algal particles and CDOM follow the general exponential functions with remarkably limited variability in the exponent with means of 0.0105 and 0.0166 nm(-1), respectively. These spectral dependencies of absorption coefficients provide useful information for retrieving inherent optical properties from reflectance data in a remote-sensing context. (C) 2010 Elsevier Ltd. All rights reserved.
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WOS记录号: WOS:000278665300006
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/6289
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Wang, GF; Cao, WX; Yang, YZ; Zhou, W; Liu, S; Yang, DT.Variations in light absorption properties during a phytoplankton bloom in the Pearl River estuary,CONTINENTAL SHELF RESEARCH,2010,30(9):1085-1094
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