Retrieval of phytoplankton cell size from chlorophyll a specific absorption and scattering spectra of phytoplankton

Zhou Wen; Wang Guifen; Li Cai; Xu Zhantang; Cao Wenxi; Shen Fang

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Retrieval of phytoplankton cell size from chlorophyll a specific absorption and scattering spectra of phytoplankton

机译：从叶绿素的浮游植物细胞大小检索叶绿素的特定吸收和散射光谱

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Phytoplankton cell size is an important property that affects diverse ecological and biogeochemical processes, and analysis of the absorption and scattering spectra of phytoplankton can provide important information about phytoplankton size. In this study, an inversion method for extracting quantitative phytoplankton cell size data from these spectra was developed. This inversion method requires two inputs: chlorophyll a specific absorption and scattering spectra of phytoplankton. The average equivalent-volume spherical diameter (ESDv) was calculated as the single size approximation for the log-normal particle size distribution (PSD) of the algal suspension. The performance of this method for retrieving cell size was assessed using the datasets from cultures of 12 phytoplankton species. The estimations of a(lambda) and b(lambda) for the phytoplankton population using ESDv had mean error values of 5.8%-6.9% and 7.0%-10.6%, respectively, compared to the a(lambda) and b(lambda) for the phytoplankton populations using the log-normal PSD. The estimated values of CiESDv were in good agreement with the measurements, with r(2) = 0.88 and relative root mean square error (NRMSE) = 25.3%, and relatively good performances were also found for the retrieval of ESDv with r(2) = 0.78 and NRMSE = 23.9%. (C) 2017 Optical Society of America

机译：Phytoplankton细胞大小是影响各种生态和生物地球化学过程的重要性质，并且植物浮游植物的吸收和散射光谱的分析可以提供有关浮游植物大小的重要信息。在该研究中，开发了一种从这些光谱中提取定量浮游植物细胞尺寸数据的反演方法。这种反演方法需要两个输入：叶绿素的浮游植物的特定吸收和散射光谱。平均等效体积球形直径（ESDV）计算为藻类悬浮液的对数正常粒度分布（PSD）的单尺寸近似。使用来自12种植物培养物种的数据集来评估该方法检索细胞尺寸的方法。使用ESDV的浮游植物群的（Lambda）和B（Lambda）的估计分别具有5.8％-6.9％和7.0％-10.6％的误差值，而与A（Lambda）和B（Lambda）相比使用Log-Normal PSD的Phytoplankton群体。 CIESDV的估计值与测量良好，R（2）= 0.88且相对根均方误差（NRMSE）= 25.3％，并且还发现与R（2）检索ESDV的相对良好的性能= 0.78和nrmse = 23.9％。（c）2017年光学学会

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《Applied optics》 |2017年第30期|共10页
作者
Zhou Wen; Wang Guifen; Li Cai; Xu Zhantang; Cao Wenxi; Shen Fang;
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Chinese Acad Sci South China Sea Inst Oceanol State Key Lab Trop Oceanog Guangzhou 510301 Guangdong Peoples R China;

Chinese Acad Sci South China Sea Inst Oceanol State Key Lab Trop Oceanog Guangzhou 510301 Guangdong Peoples R China;

Chinese Acad Sci South China Sea Inst Oceanol State Key Lab Trop Oceanog Guangzhou 510301 Guangdong Peoples R China;

Chinese Acad Sci South China Sea Inst Oceanol State Key Lab Trop Oceanog Guangzhou 510301 Guangdong Peoples R China;

Chinese Acad Sci South China Sea Inst Oceanol State Key Lab Trop Oceanog Guangzhou 510301 Guangdong Peoples R China;

East China Normal Univ State Key Lab Estuarine &

Coastal Res Shanghai 200062 Peoples R China;

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Retrieval of phytoplankton cell size from chlorophyll a specific absorption and scattering spectra of phytoplankton

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