收稿日期: 2009-05-06
修回日期: 2009-12-25
网络出版日期: 2010-03-23
基金资助
中国科学院重要方向性项目(KZCX2-YW-215); 国家自然科学基金项目(40906022; 40906021; 40606011)
Retrieval of pigment concentrations from the absorption spectra of phytoplankton by multilayered perceptrons
Received date: 2009-05-06
Revised date: 2009-12-25
Online published: 2010-03-23
浮游植物吸收光谱已逐渐成为高光谱水色遥感的可获取参量。文章采用了多层感知器模型, 由珠江口担杆群岛附近水体的浮游植物吸收光谱进行了色素浓度的反演, 感知器的输入量是浮游植物吸收光谱, 输出量分别对应叶绿素a、叶绿素b、叶绿素c、光保护类胡萝卜素和非光保护类胡萝卜素五大类主要色素的浓度。分析结果表明, 叶绿素a和叶绿素c估算结果的平均相对偏差比较低, 在测试数据集中两者的偏差分别为19.06%和15.90%; 光保护类胡萝卜素和非光保护类胡萝卜素的估算浓度的相对偏差比较高, 对于测试数据而言, 分别为37.62%和36.96%; 叶绿素b浓度在测试数据集中的估算相对偏差约为27.47%。五大类色素在测试数据集和训练数据集的估算偏差比较接近, 已训练好的多层感知器可用于担杆岛水体中色素信息的反演。同时, 此色素反演方法也为遥感监测水体浮游植物种群动态提供了重要的手段。
周雯,曹文熙,王桂芬,梁少君,赵俊,孙兆华 . 用多层感知器模型由吸收光谱反演浮游植物色素[J]. 热带海洋学报, 2010 , 29(2) : 46 -51 . DOI: 10.11978/j.issn.1009-5470.2010.02.046
The absorption spectra of phytoplankton have gradually become an accessible parameter from hyperspectral ocean color. The retrievals of main pigment concentrations from absorption spectra of phytoplankton by multilayered perceptrons were performed. The input parameters for multilayered perceptions were phytoplankton absorption spectra, and the retrieved parameters were Chlorophyll a, b, c, and photosynthetic and non-photosynthetic carotenoids, respectively. The results indicated that Chlorophyll a and c were the most accurate retrieval pigments with average relative deviation of 19.06% and 15.90%, respectively, for the test data subsets, while the poorest performances were found for photosynthetic and non-photosynthetic carotenoids, with average relative deviation of 37.62% and 36.96%, respectively, for the test subsets. Chlorophyll b was retrieved with average relative deviation of 27.47% for the test subsets. The comparable performances of multilayer perceptrons for the training subset and the test subsets suggest that they could be successfully operated on retrieval of main pigments for the waters around the Dangan Islands in the Pearl River Estuary. The multilayer perceptrons of retrieving main pigment from phytoplankton absorption spectra also provide an important way to detect phytoplankton community from hyperspectral ocean color.
[1] BRICAUD A, STRAMSKI D. Spectral absorption coefficients of living phytoplankton and nonalgal biogenous matter: A comparison between the Peru upwelling area and the Sargasso Sea[J]. Limnol Oceanogr, 1990, 35: 562–582.
[2] CHANG G C, DICKEY T D. Partitioning in situ total spectral absorption by use of moored spectral absorption-attenuation meters[J]. Appl Opt, 1999, 38: 3876–3887.
[3] OUBELKHEIR K, CLAUSTRE H, BRICAUD A, et al. Partitioning total spectral absorption in phytoplankton and colored detrital material ontributions
[J]. Limnol Oceanogr Methods, 2007, 5: 384–395.
[4] WANG G F, CAO W X, YANG D T, et al. Partitioning particulate absorption coefficient into contributions of phytoplankton and nonalgal particles: A case study in the northern South China Sea[J]. Estuarine, coastal and shelf Science. 2008,78: 513–520.
[5] LEE Z P, CARDER K L, ARNONE R. Deriving inherent optical properties from water color: A multi-band quasi-analytical algorithm for optically deep waters [J]. Appl Opt, 2002, 41: 5755–5772.
[6] GARVER S A, SIEGEL D. Inherent optical property inversion of ocean color spectra and its biogeochemical interpretation 1. Time series from the Sargasso Sea [J]. J Geophys Res, 1997, 102(C8): 18607–18625.
[7] SMYTH T J, MOORE G F, HIRATA T, et al. Semianalytical model for the derivation of ocean color inherent optical properties: description, implementation, and performance assessment[J]. Appl Opt 2006, 45(31): 8116–8131.
[8] CIOTTI A M, LEWIS M R, CULLEN J J. Assessment of the relationships between dominant cell size in natural phytoplankton communities and the spectral shape of the absorption coefficient[J]. Limnol Oceanogr, 2002, 47: 404–417.
[9] BRICAUD A, CLAUSTRE H, RAS J, et al. Natural variability of phytoplanktonic absorption in oceanic waters: In?uence of the size structure of algal populations[J]. J Geo phys Res, 2004, 109, C11010.
[10] MOREL A, BRICAUD A. Theoretical results concerning light absorption in a discrete medium, and application to speci?c absorption of phytoplankton[J]. Deep-Sea Res, 1981, 28: 1375–1393.
[11] BIDIGARE R R, MORROW J H, KIEFER D A. Derivative analysis of spectral absorption by photosynthetic pigments in the Western Sargasso sea
[J]. J Mar Res, 1989, 47: 323–341.
[12] MILLIE D F, SCHO?ELD O M, KIRKPATRICK G J, et al. Detection of harmful algal blooms using photopigments and absorption signatures: a case study of the Florida red-tide dino?agellate Gymnodinium breve[J]. Limnol Oceanogr, 1997, 42: 1240–1251.
[13] KIRKPATRICK G, MILLIE D F, MOLINE M A, et al. Optical discrimination of a phytoplankton species in natural mixed populations[J]. Limnol Oceanogr, 2000, 45: 467–471.
[14] BIDIGARE R R, ONDRUSEK M E, MORROW J H, et al. In vivo absorption properties of algal pigments[J]. Proc SPIE Ocean Opt X, 1990, 1302: 290–302.
[15] WANG GUIFEN, CAO WENXI, XU DAZHI, et al. Variability of phytoplankton absorption in the northern South China Sea: Influence of the size structure and pigment composition of algal populations[J]. Acta Oceanologica Sinica, 2007, 26(2): 12–25.
[16] HARIMOTO T, ISHIZAKA J, TSUDA R. Latitudinal and vertical distributions of phytoplankton absorption spectra in the central North Pacific during Spring 1994 [J]. J Oceanography, 1999, 55: 667–679.
[17] HOEPFFNER N, SATHYENDRANATH S. Determination of the major groups of phytoplankton pigments from the absorption spectra of total particulate matter[J]. J Geophys Res, 1993, 98: 2789–22803.
[18] STUART V, SATHYENDRANATH V S, PLATT T, et al. Pigment and species composition of natural phytoplankton populations: effect on the absorption spectra[J]. J Plankton Res, 1998, 20:187–217.
[19] LOHRENZ S E, WEIDEMANN A D, TUEL M. Phytoplankton spectral absorption as influenced by community size structure and pigment composition[J]. Journal of Plankton Research, 2003, 25(1): 35–61.
[20] BRICAUD A, MEJIA C, BLONDEAU-PATISSIER D, et al. Retrieval of pigment concentrations and size structure of algal populations from their absorption spectra using multilayered perceptrons[J]. Appl Opt, 2007, 46(8): 1251–1260.
[21] CAO W, YANG Y, XU X, et a1. Regional patterns of particulate spectral absorption in the Pearl River estuary[J]. Chinese Science Bulletin, 2003, 48(21): 2344–2351.
[22] 赵冬至, 罗虎, 傅云娜, 等. 海洋水色组分吸收系数的测定方法研究[J]. 海洋通报, 2004, 23 (3): 81–86.
[23] 王桂芬, 曹文熙, 许大志, 等. 南海北部水体浮游植物比吸收系数的变化[J]. 热带海洋学报, 2005, 24(5): 1–10.
[24] PARSONS T R, MAITA Y, LALLI C M. A Manual of Chemical and Biological Methods for Seawater Analysis[M]. Oxford: Pergamon Press, 1984.
[25] VIDUSSI F, CLAUSTRE H, BUSTILLOS-GUZMAN J, et al. Determination of chlorophylls and catotenoids of marine phytoplankton: Separation of chlorophyll a from divinychlorophyll a and zeaxanthin from lateen[J]. J Plank Res, 1996, 18(12): 2377–2382.
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